diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 121e4abfe..e65cae9d8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -25,6 +25,8 @@ before_script:
   - apt-get update && apt-get install -y cmake
   - mix local.hex --force
   - mix local.rebar --force
+  - apt-get -qq update
+  - apt-get install -y libmagic-dev
 
 build:
   stage: build
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8fc1750d1..36a84b1a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Changed
 
+- **Breaking** Requires `libmagic` (or `file`) to guess file types.
 - **Breaking:** Pleroma Admin API: emoji packs and files routes changed.
 - **Breaking:** Sensitive/NSFW statuses no longer disable link previews.
 - Search: Users are now findable by their urls.
diff --git a/config/config.exs b/config/config.exs
index 273da5bb6..2c6142360 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -802,6 +802,8 @@
     timeout: 300_000
   ]
 
+config :pleroma, :majic_pool, size: 2
+
 private_instance? = :if_instance_is_private
 
 config :pleroma, :restrict_unauthenticated,
diff --git a/config/description.exs b/config/description.exs
index 6e83a8e09..2a1898922 100644
--- a/config/description.exs
+++ b/config/description.exs
@@ -3708,5 +3708,19 @@
         ]
       }
     ]
+  },
+  %{
+    group: :pleroma,
+    key: :majic_pool,
+    type: :group,
+    description: "Majic/libmagic configuration",
+    children: [
+      %{
+        key: :size,
+        type: :integer,
+        description: "Number of majic workers to start.",
+        suggestions: [2]
+      }
+    ]
   }
 ]
diff --git a/docs/installation/alpine_linux_en.md b/docs/installation/alpine_linux_en.md
index d89c7f46f..62f2fb778 100644
--- a/docs/installation/alpine_linux_en.md
+++ b/docs/installation/alpine_linux_en.md
@@ -13,6 +13,7 @@ It assumes that you have administrative rights, either as root or a user with [s
 * `erlang-parsetools`
 * `erlang-xmerl`
 * `git`
+* `file-dev`
 * Development Tools
 * `cmake`
 
@@ -42,7 +43,7 @@ sudo apk upgrade
 * Install some tools, which are needed later:
 
 ```shell
-sudo apk add git build-base cmake
+sudo apk add git build-base cmake file-dev
 ```
 
 ### Install Elixir and Erlang
diff --git a/docs/installation/arch_linux_en.md b/docs/installation/arch_linux_en.md
index 724b4660a..0eb6d2d5f 100644
--- a/docs/installation/arch_linux_en.md
+++ b/docs/installation/arch_linux_en.md
@@ -10,6 +10,7 @@ This guide will assume that you have administrative rights, either as root or a
 * `git`
 * `base-devel`
 * `cmake`
+* `file`
 
 #### Optional packages used in this guide
 
@@ -30,7 +31,7 @@ sudo pacman -Syu
 * Install some of the above mentioned programs:
 
 ```shell
-sudo pacman -S git base-devel elixir cmake
+sudo pacman -S git base-devel elixir cmake file
 ```
 
 ### Install PostgreSQL
diff --git a/docs/installation/debian_based_en.md b/docs/installation/debian_based_en.md
index eac499a29..6a9026d94 100644
--- a/docs/installation/debian_based_en.md
+++ b/docs/installation/debian_based_en.md
@@ -10,6 +10,7 @@ This guide will assume you are on Debian Stretch. This guide should also work wi
 * `elixir` (1.8+, Follow the guide to install from the Erlang Solutions repo or use [asdf](https://github.com/asdf-vm/asdf) as the pleroma user)
 * `erlang-dev`
 * `erlang-nox`
+* `libmagic-dev`
 * `git`
 * `build-essential`
 * `cmake`
@@ -34,7 +35,7 @@ sudo apt full-upgrade
 * Install some of the above mentioned programs:
 
 ```shell
-sudo apt install git build-essential postgresql postgresql-contrib cmake
+sudo apt install git build-essential postgresql postgresql-contrib cmake libmagic-devel
 ```
 
 ### Install Elixir and Erlang
diff --git a/docs/installation/debian_based_jp.md b/docs/installation/debian_based_jp.md
index 764afbe1a..94e22325c 100644
--- a/docs/installation/debian_based_jp.md
+++ b/docs/installation/debian_based_jp.md
@@ -17,6 +17,7 @@
 - `git`
 - `build-essential`
 - `cmake`
+- `libmagic-dev`
 
 #### このガイドで利用している追加パッケージ
 
@@ -36,7 +37,7 @@ sudo apt full-upgrade
 
 * 上記に挙げたパッケージをインストールしておきます。
 ```
-sudo apt install git build-essential postgresql postgresql-contrib cmake ffmpeg imagemagick
+sudo apt install git build-essential postgresql postgresql-contrib cmake ffmpeg imagemagick libmagic-dev
 ```
 
 ### ElixirとErlangをインストールします
diff --git a/docs/installation/gentoo_en.md b/docs/installation/gentoo_en.md
index 638fc4e47..f2380ab72 100644
--- a/docs/installation/gentoo_en.md
+++ b/docs/installation/gentoo_en.md
@@ -29,6 +29,7 @@ Gentoo quite pointedly does not come with a cron daemon installed, and as such i
 * `dev-lang/elixir`
 * `dev-vcs/git`
 * `dev-util/cmake`
+* `sys-apps/file`
 
 #### Optional ebuilds used in this guide
 
@@ -50,7 +51,7 @@ Gentoo quite pointedly does not come with a cron daemon installed, and as such i
 * Emerge all required the required and suggested software in one go:
 
 ```shell
- # emerge --ask dev-db/postgresql dev-lang/elixir dev-vcs/git www-servers/nginx app-crypt/certbot app-crypt/certbot-nginx dev-util/cmake
+ # emerge --ask dev-db/postgresql dev-lang/elixir dev-vcs/git www-servers/nginx app-crypt/certbot app-crypt/certbot-nginx dev-util/cmake sys-apps/file
 ```
 
 If you would not like to install the optional packages, remove them from this line. 
diff --git a/docs/installation/otp_en.md b/docs/installation/otp_en.md
index 92584d80d..62d4c8a72 100644
--- a/docs/installation/otp_en.md
+++ b/docs/installation/otp_en.md
@@ -27,17 +27,18 @@ Other than things bundled in the OTP release Pleroma depends on:
 * PostgreSQL (also utilizes extensions in postgresql-contrib)
 * nginx (could be swapped with another reverse proxy but this guide covers only it)
 * certbot (for Let's Encrypt certificates, could be swapped with another ACME client, but this guide covers only it)
+* libmagic/file
 
 === "Alpine"
     ```
     echo "http://nl.alpinelinux.org/alpine/latest-stable/community" >> /etc/apk/repositories
     apk update
-    apk add curl unzip ncurses postgresql postgresql-contrib nginx certbot
+    apk add curl unzip ncurses postgresql postgresql-contrib nginx certbot file-dev
     ```
 
 === "Debian/Ubuntu"
     ```
-    apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot
+    apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot libmagic-dev
     ```
 
 ### Installing optional packages
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index 958e32db2..301b4e273 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -95,6 +95,7 @@ def start(_type, _args) do
         [
           Pleroma.Stats,
           Pleroma.JobQueueMonitor,
+          {Majic.Pool, [name: Pleroma.MajicPool, pool_size: Config.get([:majic_pool, :size], 2)]},
           {Oban, Config.get(Oban)}
         ] ++
         task_children(@env) ++
diff --git a/lib/pleroma/mime.ex b/lib/pleroma/mime.ex
deleted file mode 100644
index 6ee055f50..000000000
--- a/lib/pleroma/mime.ex
+++ /dev/null
@@ -1,120 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.MIME do
-  @moduledoc """
-  Returns the mime-type of a binary and optionally a normalized file-name.
-  """
-  @default "application/octet-stream"
-  @read_bytes 35
-
-  @spec file_mime_type(String.t(), String.t()) ::
-          {:ok, content_type :: String.t(), filename :: String.t()} | {:error, any()} | :error
-  def file_mime_type(path, filename) do
-    with {:ok, content_type} <- file_mime_type(path),
-         filename <- fix_extension(filename, content_type) do
-      {:ok, content_type, filename}
-    end
-  end
-
-  @spec file_mime_type(String.t()) :: {:ok, String.t()} | {:error, any()} | :error
-  def file_mime_type(filename) do
-    File.open(filename, [:read], fn f ->
-      check_mime_type(IO.binread(f, @read_bytes))
-    end)
-  end
-
-  def bin_mime_type(binary, filename) do
-    with {:ok, content_type} <- bin_mime_type(binary),
-         filename <- fix_extension(filename, content_type) do
-      {:ok, content_type, filename}
-    end
-  end
-
-  @spec bin_mime_type(binary()) :: {:ok, String.t()} | :error
-  def bin_mime_type(<<head::binary-size(@read_bytes), _::binary>>) do
-    {:ok, check_mime_type(head)}
-  end
-
-  def bin_mime_type(_), do: :error
-
-  def mime_type(<<_::binary>>), do: {:ok, @default}
-
-  defp fix_extension(filename, content_type) do
-    parts = String.split(filename, ".")
-
-    new_filename =
-      if length(parts) > 1 do
-        Enum.drop(parts, -1) |> Enum.join(".")
-      else
-        Enum.join(parts)
-      end
-
-    cond do
-      content_type == "application/octet-stream" ->
-        filename
-
-      ext = List.first(MIME.extensions(content_type)) ->
-        new_filename <> "." <> ext
-
-      true ->
-        Enum.join([new_filename, String.split(content_type, "/") |> List.last()], ".")
-    end
-  end
-
-  defp check_mime_type(<<0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, _::binary>>) do
-    "image/png"
-  end
-
-  defp check_mime_type(<<0x47, 0x49, 0x46, 0x38, _, 0x61, _::binary>>) do
-    "image/gif"
-  end
-
-  defp check_mime_type(<<0xFF, 0xD8, 0xFF, _::binary>>) do
-    "image/jpeg"
-  end
-
-  defp check_mime_type(<<0x1A, 0x45, 0xDF, 0xA3, _::binary>>) do
-    "video/webm"
-  end
-
-  defp check_mime_type(<<0x00, 0x00, 0x00, _, 0x66, 0x74, 0x79, 0x70, _::binary>>) do
-    "video/mp4"
-  end
-
-  defp check_mime_type(<<0x49, 0x44, 0x33, _::binary>>) do
-    "audio/mpeg"
-  end
-
-  defp check_mime_type(<<255, 251, _, 68, 0, 0, 0, 0, _::binary>>) do
-    "audio/mpeg"
-  end
-
-  defp check_mime_type(
-         <<0x4F, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, _::size(160), 0x80, 0x74, 0x68, 0x65,
-           0x6F, 0x72, 0x61, _::binary>>
-       ) do
-    "video/ogg"
-  end
-
-  defp check_mime_type(<<0x4F, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, _::binary>>) do
-    "audio/ogg"
-  end
-
-  defp check_mime_type(<<"RIFF", _::binary-size(4), "WAVE", _::binary>>) do
-    "audio/wav"
-  end
-
-  defp check_mime_type(<<"RIFF", _::binary-size(4), "WEBP", _::binary>>) do
-    "image/webp"
-  end
-
-  defp check_mime_type(<<"RIFF", _::binary-size(4), "AVI.", _::binary>>) do
-    "video/avi"
-  end
-
-  defp check_mime_type(_) do
-    @default
-  end
-end
diff --git a/lib/pleroma/upload.ex b/lib/pleroma/upload.ex
index 015c87593..db2cc1dae 100644
--- a/lib/pleroma/upload.ex
+++ b/lib/pleroma/upload.ex
@@ -66,6 +66,7 @@ defp get_description(opts, upload) do
   end
 
   @spec store(source, options :: [option()]) :: {:ok, Map.t()} | {:error, any()}
+  @doc "Store a file. If using a `Plug.Upload{}` as the source, be sure to use `Majic.Plug` to ensure its content_type and filename is correct."
   def store(upload, opts \\ []) do
     opts = get_opts(opts)
 
@@ -139,14 +140,13 @@ defp get_opts(opts) do
   end
 
   defp prepare_upload(%Plug.Upload{} = file, opts) do
-    with :ok <- check_file_size(file.path, opts.size_limit),
-         {:ok, content_type, name} <- Pleroma.MIME.file_mime_type(file.path, file.filename) do
+    with :ok <- check_file_size(file.path, opts.size_limit) do
       {:ok,
        %__MODULE__{
          id: UUID.generate(),
-         name: name,
+         name: file.filename,
          tempfile: file.path,
-         content_type: content_type
+         content_type: file.content_type
        }}
     end
   end
@@ -154,16 +154,17 @@ defp prepare_upload(%Plug.Upload{} = file, opts) do
   defp prepare_upload(%{img: "data:image/" <> image_data}, opts) do
     parsed = Regex.named_captures(~r/(?<filetype>jpeg|png|gif);base64,(?<data>.*)/, image_data)
     data = Base.decode64!(parsed["data"], ignore: :whitespace)
-    hash = String.downcase(Base.encode16(:crypto.hash(:sha256, data)))
+    hash = Base.encode16(:crypto.hash(:sha256, data), lower: true)
 
     with :ok <- check_binary_size(data, opts.size_limit),
          tmp_path <- tempfile_for_image(data),
-         {:ok, content_type, name} <-
-           Pleroma.MIME.bin_mime_type(data, hash <> "." <> parsed["filetype"]) do
+         {:ok, %{mime_type: content_type}} <-
+           Majic.perform({:bytes, data}, pool: Pleroma.MajicPool),
+         [ext | _] <- MIME.extensions(content_type) do
       {:ok,
        %__MODULE__{
          id: UUID.generate(),
-         name: name,
+         name: hash <> "." <> ext,
          tempfile: tmp_path,
          content_type: content_type
        }}
@@ -172,7 +173,7 @@ defp prepare_upload(%{img: "data:image/" <> image_data}, opts) do
 
   # For Mix.Tasks.MigrateLocalUploads
   defp prepare_upload(%__MODULE__{tempfile: path} = upload, _opts) do
-    with {:ok, content_type} <- Pleroma.MIME.file_mime_type(path) do
+    with {:ok, %{mime_type: content_type}} <- Majic.perform(path, pool: Pleroma.MajicPool) do
       {:ok, %__MODULE__{upload | content_type: content_type}}
     end
   end
diff --git a/lib/pleroma/web/activity_pub/activity_pub_controller.ex b/lib/pleroma/web/activity_pub/activity_pub_controller.ex
index 6bf7421bb..570bcc7e7 100644
--- a/lib/pleroma/web/activity_pub/activity_pub_controller.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub_controller.ex
@@ -45,6 +45,8 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
     when action in [:read_inbox, :update_outbox, :whoami, :upload_media]
   )
 
+  plug(Majic.Plug, [pool: Pleroma.MajicPool] when action in [:upload_media])
+
   plug(
     Pleroma.Web.Plugs.Cache,
     [query_params: false, tracking_fun: &__MODULE__.track_object_fetch/2]
diff --git a/lib/pleroma/web/mastodon_api/controllers/media_controller.ex b/lib/pleroma/web/mastodon_api/controllers/media_controller.ex
index 9586b14bc..161193134 100644
--- a/lib/pleroma/web/mastodon_api/controllers/media_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/media_controller.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.Web.MastodonAPI.MediaController do
   alias Pleroma.Web.Plugs.OAuthScopesPlug
 
   action_fallback(Pleroma.Web.MastodonAPI.FallbackController)
+  plug(Majic.Plug, [pool: Pleroma.MajicPool] when action in [:create, :create2])
   plug(Pleroma.Web.ApiSpec.CastAndValidate)
   plug(:put_view, Pleroma.Web.MastodonAPI.StatusView)
 
diff --git a/lib/pleroma/web/pleroma_api/controllers/account_controller.ex b/lib/pleroma/web/pleroma_api/controllers/account_controller.ex
index 61f4a9bd9..30cf83567 100644
--- a/lib/pleroma/web/pleroma_api/controllers/account_controller.ex
+++ b/lib/pleroma/web/pleroma_api/controllers/account_controller.ex
@@ -17,6 +17,11 @@ defmodule Pleroma.Web.PleromaAPI.AccountController do
 
   require Pleroma.Constants
 
+  plug(
+    Majic.Plug,
+    [pool: Pleroma.MajicPool] when action in [:update_avatar, :update_background, :update_banner]
+  )
+
   plug(
     OpenApiSpex.Plug.PutApiSpec,
     [module: Pleroma.Web.ApiSpec] when action == :confirmation_resend
diff --git a/lib/pleroma/web/pleroma_api/controllers/mascot_controller.ex b/lib/pleroma/web/pleroma_api/controllers/mascot_controller.ex
index 0f6f0b9db..15210f1e6 100644
--- a/lib/pleroma/web/pleroma_api/controllers/mascot_controller.ex
+++ b/lib/pleroma/web/pleroma_api/controllers/mascot_controller.ex
@@ -9,6 +9,7 @@ defmodule Pleroma.Web.PleromaAPI.MascotController do
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.Plugs.OAuthScopesPlug
 
+  plug(Majic.Plug, [pool: Pleroma.MajicPool] when action in [:update])
   plug(Pleroma.Web.ApiSpec.CastAndValidate)
   plug(OAuthScopesPlug, %{scopes: ["read:accounts"]} when action == :show)
   plug(OAuthScopesPlug, %{scopes: ["write:accounts"]} when action != :show)
@@ -22,14 +23,15 @@ def show(%{assigns: %{user: user}} = conn, _params) do
 
   @doc "PUT /api/v1/pleroma/mascot"
   def update(%{assigns: %{user: user}, body_params: %{file: file}} = conn, _) do
-    with {:ok, object} <- ActivityPub.upload(file, actor: User.ap_id(user)),
-         # Reject if not an image
-         %{type: "image"} = attachment <- render_attachment(object) do
+    with {:content_type, "image" <> _} <- {:content_type, file.content_type},
+         {:ok, object} <- ActivityPub.upload(file, actor: User.ap_id(user)) do
+      attachment = render_attachment(object)
       {:ok, _user} = User.mascot_update(user, attachment)
 
       json(conn, attachment)
     else
-      %{type: _} -> render_error(conn, :unsupported_media_type, "mascots can only be images")
+      {:content_type, _} ->
+        render_error(conn, :unsupported_media_type, "mascots can only be images")
     end
   end
 
diff --git a/mix.exs b/mix.exs
index b9ce8c500..427329d38 100644
--- a/mix.exs
+++ b/mix.exs
@@ -188,6 +188,8 @@ defp deps do
        git: "https://git.pleroma.social/pleroma/elixir-libraries/elixir-captcha.git",
        ref: "e0f16822d578866e186a0974d65ad58cddc1e2ab"},
       {:restarter, path: "./restarter"},
+      {:majic,
+       git: "https://git.pleroma.social/pleroma/elixir-libraries/majic", branch: "develop"},
       {:open_api_spex,
        git: "https://git.pleroma.social/pleroma/elixir-libraries/open_api_spex.git",
        ref: "f296ac0924ba3cf79c7a588c4c252889df4c2edd"},
diff --git a/mix.lock b/mix.lock
index 2603f70c0..1f2885440 100644
--- a/mix.lock
+++ b/mix.lock
@@ -32,7 +32,7 @@
   "ecto_enum": {:hex, :ecto_enum, "1.4.0", "d14b00e04b974afc69c251632d1e49594d899067ee2b376277efd8233027aec8", [:mix], [{:ecto, ">= 3.0.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "> 3.0.0", [hex: :ecto_sql, repo: "hexpm", optional: false]}, {:mariaex, ">= 0.0.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:postgrex, ">= 0.0.0", [hex: :postgrex, repo: "hexpm", optional: true]}], "hexpm", "8fb55c087181c2b15eee406519dc22578fa60dd82c088be376d0010172764ee4"},
   "ecto_sql": {:hex, :ecto_sql, "3.4.5", "30161f81b167d561a9a2df4329c10ae05ff36eca7ccc84628f2c8b9fa1e43323", [:mix], [{:db_connection, "~> 2.2", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.4.3", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.3.0 or ~> 0.4.0", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.15.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.0", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "31990c6a3579b36a3c0841d34a94c275e727de8b84f58509da5f1b2032c98ac2"},
   "eimp": {:hex, :eimp, "1.0.14", "fc297f0c7e2700457a95a60c7010a5f1dcb768a083b6d53f49cd94ab95a28f22", [:rebar3], [{:p1_utils, "1.0.18", [hex: :p1_utils, repo: "hexpm", optional: false]}], "hexpm", "501133f3112079b92d9e22da8b88bf4f0e13d4d67ae9c15c42c30bd25ceb83b6"},
-  "elixir_make": {:hex, :elixir_make, "0.6.0", "38349f3e29aff4864352084fc736fa7fa0f2995a819a737554f7ebd28b85aaab", [:mix], [], "hexpm", "d522695b93b7f0b4c0fcb2dfe73a6b905b1c301226a5a55cb42e5b14d509e050"},
+  "elixir_make": {:hex, :elixir_make, "0.6.1", "8faa29a5597faba999aeeb72bbb9c91694ef8068f0131192fb199f98d32994ef", [:mix], [], "hexpm", "35d33270680f8d839a4003c3e9f43afb595310a592405a00afc12de4c7f55a18"},
   "esshd": {:hex, :esshd, "0.1.1", "d4dd4c46698093a40a56afecce8a46e246eb35463c457c246dacba2e056f31b5", [:mix], [], "hexpm", "d73e341e3009d390aa36387dc8862860bf9f874c94d9fd92ade2926376f49981"},
   "eternal": {:hex, :eternal, "1.2.1", "d5b6b2499ba876c57be2581b5b999ee9bdf861c647401066d3eeed111d096bc4", [:mix], [], "hexpm", "b14f1dc204321429479c569cfbe8fb287541184ed040956c8862cb7a677b8406"},
   "ex2ms": {:hex, :ex2ms, "1.5.0", "19e27f9212be9a96093fed8cdfbef0a2b56c21237196d26760f11dfcfae58e97", [:mix], [], "hexpm"},
@@ -65,6 +65,7 @@
   "jumper": {:hex, :jumper, "1.0.1", "3c00542ef1a83532b72269fab9f0f0c82bf23a35e27d278bfd9ed0865cecabff", [:mix], [], "hexpm", "318c59078ac220e966d27af3646026db9b5a5e6703cb2aa3e26bcfaba65b7433"},
   "libring": {:hex, :libring, "1.4.0", "41246ba2f3fbc76b3971f6bce83119dfec1eee17e977a48d8a9cfaaf58c2a8d6", [:mix], [], "hexpm"},
   "linkify": {:hex, :linkify, "0.2.0", "2518bbbea21d2caa9d372424e1ad845b640c6630e2d016f1bd1f518f9ebcca28", [:mix], [], "hexpm", "b8ca8a68b79e30b7938d6c996085f3db14939f29538a59ca5101988bb7f917f6"},
+  "majic": {:git, "https://git.pleroma.social/pleroma/elixir-libraries/majic", "4c692e544b28d1f5e543fb8a44be090f8cd96f80", [branch: "develop"]},
   "makeup": {:hex, :makeup, "1.0.3", "e339e2f766d12e7260e6672dd4047405963c5ec99661abdc432e6ec67d29ef95", [:mix], [{:nimble_parsec, "~> 0.5", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "2e9b4996d11832947731f7608fed7ad2f9443011b3b479ae288011265cdd3dad"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.14.1", "4f0e96847c63c17841d42c08107405a005a2680eb9c7ccadfd757bd31dabccfb", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "f2438b1a80eaec9ede832b5c41cd4f373b38fd7aa33e3b22d9db79e640cbde11"},
   "meck": {:hex, :meck, "0.8.13", "ffedb39f99b0b99703b8601c6f17c7f76313ee12de6b646e671e3188401f7866", [:rebar3], [], "hexpm", "d34f013c156db51ad57cc556891b9720e6a1c1df5fe2e15af999c84d6cebeb1a"},
diff --git a/test/pleroma/object_test.exs b/test/pleroma/object_test.exs
index 198d3b1cf..99caba336 100644
--- a/test/pleroma/object_test.exs
+++ b/test/pleroma/object_test.exs
@@ -82,7 +82,7 @@ test "Disabled via config" do
       Pleroma.Config.put([:instance, :cleanup_attachments], false)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -116,7 +116,7 @@ test "in subdirectories" do
       Pleroma.Config.put([:instance, :cleanup_attachments], true)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -155,7 +155,7 @@ test "with dedupe enabled" do
       File.mkdir_p!(uploads_dir)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -188,7 +188,7 @@ test "with objects that have legacy data.url attribute" do
       Pleroma.Config.put([:instance, :cleanup_attachments], true)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -225,7 +225,7 @@ test "With custom base_url" do
       Pleroma.Config.put([:instance, :cleanup_attachments], true)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/upload/filter/anonymize_filename_test.exs b/test/pleroma/upload/filter/anonymize_filename_test.exs
index 19b915cc8..7ef01ce91 100644
--- a/test/pleroma/upload/filter/anonymize_filename_test.exs
+++ b/test/pleroma/upload/filter/anonymize_filename_test.exs
@@ -13,7 +13,7 @@ defmodule Pleroma.Upload.Filter.AnonymizeFilenameTest do
 
     upload_file = %Upload{
       name: "an… image.jpg",
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image_tmp.jpg")
     }
 
diff --git a/test/pleroma/upload/filter/dedupe_test.exs b/test/pleroma/upload/filter/dedupe_test.exs
index 75c7198e1..92a3d7df3 100644
--- a/test/pleroma/upload/filter/dedupe_test.exs
+++ b/test/pleroma/upload/filter/dedupe_test.exs
@@ -18,7 +18,7 @@ test "adds shasum" do
 
     upload = %Upload{
       name: "an… image.jpg",
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image_tmp.jpg"),
       tempfile: Path.absname("test/fixtures/image_tmp.jpg")
     }
diff --git a/test/pleroma/upload/filter/exiftool_test.exs b/test/pleroma/upload/filter/exiftool_test.exs
index d4cd4ba11..6b978b64c 100644
--- a/test/pleroma/upload/filter/exiftool_test.exs
+++ b/test/pleroma/upload/filter/exiftool_test.exs
@@ -16,7 +16,7 @@ test "apply exiftool filter" do
 
     upload = %Pleroma.Upload{
       name: "image_with_GPS_data.jpg",
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/DSCN0010.jpg"),
       tempfile: Path.absname("test/fixtures/DSCN0010_tmp.jpg")
     }
diff --git a/test/pleroma/upload/filter/mogrifun_test.exs b/test/pleroma/upload/filter/mogrifun_test.exs
index dc1e9e78f..fc2f68276 100644
--- a/test/pleroma/upload/filter/mogrifun_test.exs
+++ b/test/pleroma/upload/filter/mogrifun_test.exs
@@ -17,7 +17,7 @@ test "apply mogrify filter" do
 
     upload = %Upload{
       name: "an… image.jpg",
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image_tmp.jpg"),
       tempfile: Path.absname("test/fixtures/image_tmp.jpg")
     }
diff --git a/test/pleroma/upload/filter/mogrify_test.exs b/test/pleroma/upload/filter/mogrify_test.exs
index bf64b96b3..6dee02e8b 100644
--- a/test/pleroma/upload/filter/mogrify_test.exs
+++ b/test/pleroma/upload/filter/mogrify_test.exs
@@ -18,7 +18,7 @@ test "apply mogrify filter" do
 
     upload = %Pleroma.Upload{
       name: "an… image.jpg",
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image_tmp.jpg"),
       tempfile: Path.absname("test/fixtures/image_tmp.jpg")
     }
diff --git a/test/pleroma/upload/filter_test.exs b/test/pleroma/upload/filter_test.exs
index 352b66402..09394929c 100644
--- a/test/pleroma/upload/filter_test.exs
+++ b/test/pleroma/upload/filter_test.exs
@@ -20,7 +20,7 @@ test "applies filters" do
 
     upload = %Pleroma.Upload{
       name: "an… image.jpg",
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image_tmp.jpg"),
       tempfile: Path.absname("test/fixtures/image_tmp.jpg")
     }
diff --git a/test/pleroma/upload_test.exs b/test/pleroma/upload_test.exs
index b06b54487..f52d4dff6 100644
--- a/test/pleroma/upload_test.exs
+++ b/test/pleroma/upload_test.exs
@@ -11,7 +11,7 @@ defmodule Pleroma.UploadTest do
   alias Pleroma.Uploaders.Uploader
 
   @upload_file %Plug.Upload{
-    content_type: "image/jpg",
+    content_type: "image/jpeg",
     path: Path.absname("test/fixtures/image_tmp.jpg"),
     filename: "image.jpg"
   }
@@ -112,7 +112,7 @@ test "does not allow descriptions longer than the post limit" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "image.jpg"
       }
@@ -124,7 +124,7 @@ test "returns a media url" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "image.jpg"
       }
@@ -140,7 +140,7 @@ test "copies the file to the configured folder with deduping" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "an [image.jpg"
       }
@@ -156,7 +156,7 @@ test "copies the file to the configured folder without deduping" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "an [image.jpg"
       }
@@ -165,63 +165,31 @@ test "copies the file to the configured folder without deduping" do
       assert data["name"] == "an [image.jpg"
     end
 
-    test "fixes incorrect content type" do
-      File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
-
-      file = %Plug.Upload{
-        content_type: "application/octet-stream",
-        path: Path.absname("test/fixtures/image_tmp.jpg"),
-        filename: "an [image.jpg"
+    test "fixes incorrect content type when base64 is given" do
+      params = %{
+        img: "data:image/png;base64,#{Base.encode64(File.read!("test/fixtures/image.jpg"))}"
       }
 
-      {:ok, data} = Upload.store(file, filters: [Pleroma.Upload.Filter.Dedupe])
+      {:ok, data} = Upload.store(params)
       assert hd(data["url"])["mediaType"] == "image/jpeg"
     end
 
-    test "adds missing extension" do
+    test "adds extension when base64 is given" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
-      file = %Plug.Upload{
-        content_type: "image/jpg",
-        path: Path.absname("test/fixtures/image_tmp.jpg"),
-        filename: "an [image"
+      params = %{
+        img: "data:image/png;base64,#{Base.encode64(File.read!("test/fixtures/image.jpg"))}"
       }
 
-      {:ok, data} = Upload.store(file)
-      assert data["name"] == "an [image.jpg"
-    end
-
-    test "fixes incorrect file extension" do
-      File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
-
-      file = %Plug.Upload{
-        content_type: "image/jpg",
-        path: Path.absname("test/fixtures/image_tmp.jpg"),
-        filename: "an [image.blah"
-      }
-
-      {:ok, data} = Upload.store(file)
-      assert data["name"] == "an [image.jpg"
-    end
-
-    test "don't modify filename of an unknown type" do
-      File.cp("test/fixtures/test.txt", "test/fixtures/test_tmp.txt")
-
-      file = %Plug.Upload{
-        content_type: "text/plain",
-        path: Path.absname("test/fixtures/test_tmp.txt"),
-        filename: "test.txt"
-      }
-
-      {:ok, data} = Upload.store(file)
-      assert data["name"] == "test.txt"
+      {:ok, data} = Upload.store(params)
+      assert String.ends_with?(data["name"], ".jpg")
     end
 
     test "copies the file to the configured folder with anonymizing filename" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "an [image.jpg"
       }
@@ -235,7 +203,7 @@ test "escapes invalid characters in url" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "an… image.jpg"
       }
@@ -250,7 +218,7 @@ test "escapes reserved uri characters" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: ":?#[]@!$&\\'()*+,;=.jpg"
       }
@@ -272,7 +240,7 @@ test "returns a media url with configured base_url" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image_tmp.jpg"),
         filename: "image.jpg"
       }
diff --git a/test/pleroma/uploaders/local_test.exs b/test/pleroma/uploaders/local_test.exs
index 18122ff6c..1ce7be485 100644
--- a/test/pleroma/uploaders/local_test.exs
+++ b/test/pleroma/uploaders/local_test.exs
@@ -19,7 +19,7 @@ test "put file to local folder" do
 
       file = %Pleroma.Upload{
         name: "image.jpg",
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: file_path,
         tempfile: Path.absname("test/fixtures/image_tmp.jpg")
       }
@@ -38,7 +38,7 @@ test "deletes local file" do
 
       file = %Pleroma.Upload{
         name: "image.jpg",
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: file_path,
         tempfile: Path.absname("test/fixtures/image_tmp.jpg")
       }
diff --git a/test/pleroma/uploaders/s3_test.exs b/test/pleroma/uploaders/s3_test.exs
index d949c90a5..e7a013dd8 100644
--- a/test/pleroma/uploaders/s3_test.exs
+++ b/test/pleroma/uploaders/s3_test.exs
@@ -56,7 +56,7 @@ test "it returns path with bucket namespace when namespace is set" do
     setup do
       file_upload = %Pleroma.Upload{
         name: "image-tet.jpg",
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: "test_folder/image-tet.jpg",
         tempfile: Path.absname("test/instance_static/add/shortcode.png")
       }
diff --git a/test/pleroma/web/activity_pub/activity_pub_controller_test.exs b/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
index 0517571f2..b11e2f961 100644
--- a/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
+++ b/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
@@ -1487,9 +1487,9 @@ test "POST /api/ap/upload_media", %{conn: conn} do
       desc = "Description of the image"
 
       image = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "bad/content-type",
         path: Path.absname("test/fixtures/image.jpg"),
-        filename: "an_image.jpg"
+        filename: "an_image.png"
       }
 
       object =
@@ -1504,6 +1504,7 @@ test "POST /api/ap/upload_media", %{conn: conn} do
       assert [%{"href" => object_href, "mediaType" => object_mediatype}] = object["url"]
       assert is_binary(object_href)
       assert object_mediatype == "image/jpeg"
+      assert String.ends_with?(object_href, ".jpg")
 
       activity_request = %{
         "@context" => "https://www.w3.org/ns/activitystreams",
diff --git a/test/pleroma/web/activity_pub/activity_pub_test.exs b/test/pleroma/web/activity_pub/activity_pub_test.exs
index 3efc0d1b4..1a8a844ca 100644
--- a/test/pleroma/web/activity_pub/activity_pub_test.exs
+++ b/test/pleroma/web/activity_pub/activity_pub_test.exs
@@ -1029,7 +1029,7 @@ test "returns reblogs for users for whom reblogs have not been muted" do
   describe "uploading files" do
     setup do
       test_file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
index 558bb3131..760388e80 100644
--- a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
@@ -56,7 +56,7 @@ test "it handles our own uploads" do
       user = insert(:user)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/activity_pub/object_validators/chat_validation_test.exs b/test/pleroma/web/activity_pub/object_validators/chat_validation_test.exs
index 16e4808e5..d7e299224 100644
--- a/test/pleroma/web/activity_pub/object_validators/chat_validation_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/chat_validation_test.exs
@@ -77,7 +77,7 @@ test "validates for a basic object with an attachment", %{
       user: user
     } do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -98,7 +98,7 @@ test "validates for a basic object with an attachment in an array", %{
       user: user
     } do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -119,7 +119,7 @@ test "validates for a basic object with an attachment but without content", %{
       user: user
     } do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index a8e22d44f..f5d09f396 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -100,7 +100,7 @@ test "it posts a chat message without content but with an attachment" do
       recipient = insert(:user)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
index 0b803b7ab..7336fa8de 100644
--- a/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
@@ -380,7 +380,7 @@ test "gets an users media, excludes reblogs", %{conn: conn} do
       other_user = insert(:user)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs
index 906fd940f..d2bd57515 100644
--- a/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/media_controller_test.exs
@@ -14,7 +14,7 @@ defmodule Pleroma.Web.MastodonAPI.MediaControllerTest do
 
     setup do
       image = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -74,7 +74,7 @@ test "/api/v2/media", %{conn: conn, user: user, image: image} do
 
     setup %{user: actor} do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -106,7 +106,7 @@ test "/api/v1/media/:id good request", %{conn: conn, object: object} do
 
     setup %{user: actor} do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index 633a25e50..61359214a 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -167,7 +167,7 @@ test "Get MRF reason when posting a status is rejected by one", %{conn: conn} do
 
     test "posting an undefined status with an attachment", %{user: user, conn: conn} do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -408,7 +408,7 @@ test "creates a scheduled activity with a media attachment", %{user: user, conn:
         |> Kernel.<>("Z")
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/mastodon_api/update_credentials_test.exs b/test/pleroma/web/mastodon_api/update_credentials_test.exs
index fe462caa3..ed1921c91 100644
--- a/test/pleroma/web/mastodon_api/update_credentials_test.exs
+++ b/test/pleroma/web/mastodon_api/update_credentials_test.exs
@@ -222,7 +222,7 @@ test "updates the user's name", %{conn: conn} do
 
     test "updates the user's avatar", %{user: user, conn: conn} do
       new_avatar = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -246,7 +246,7 @@ test "updates the user's avatar", %{user: user, conn: conn} do
 
     test "updates the user's banner", %{user: user, conn: conn} do
       new_header = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
@@ -265,7 +265,7 @@ test "updates the user's banner", %{user: user, conn: conn} do
 
     test "updates the user's background", %{conn: conn, user: user} do
       new_header = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs b/test/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs
index fbfd873ef..04f73f5a0 100644
--- a/test/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs
+++ b/test/pleroma/web/mastodon_api/views/scheduled_activity_view_test.exs
@@ -22,7 +22,7 @@ test "A scheduled activity with a media attachment" do
       |> NaiveDateTime.to_iso8601()
 
     file = %Plug.Upload{
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image.jpg"),
       filename: "an_image.jpg"
     }
diff --git a/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs b/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs
index 11d5ba373..6381f9757 100644
--- a/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs
+++ b/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs
@@ -105,7 +105,7 @@ test "it fails if there is no content", %{conn: conn, user: user} do
 
     test "it works with an attachment", %{conn: conn, user: user} do
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }
diff --git a/test/pleroma/web/pleroma_api/controllers/mascot_controller_test.exs b/test/pleroma/web/pleroma_api/controllers/mascot_controller_test.exs
index e2ead6e15..d6be92869 100644
--- a/test/pleroma/web/pleroma_api/controllers/mascot_controller_test.exs
+++ b/test/pleroma/web/pleroma_api/controllers/mascot_controller_test.exs
@@ -24,7 +24,7 @@ test "mascot upload" do
     assert json_response_and_validate_schema(ret_conn, 415)
 
     file = %Plug.Upload{
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image.jpg"),
       filename: "an_image.jpg"
     }
@@ -48,7 +48,7 @@ test "mascot retrieving" do
 
     # When a user sets their mascot, we should get that back
     file = %Plug.Upload{
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image.jpg"),
       filename: "an_image.jpg"
     }
diff --git a/test/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs b/test/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs
index 26272c125..f171a1e55 100644
--- a/test/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs
+++ b/test/pleroma/web/pleroma_api/views/chat_message_reference_view_test.exs
@@ -19,7 +19,7 @@ test "it displays a chat message" do
     recipient = insert(:user)
 
     file = %Plug.Upload{
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image.jpg"),
       filename: "an_image.jpg"
     }
diff --git a/test/pleroma/web/plugs/uploaded_media_plug_test.exs b/test/pleroma/web/plugs/uploaded_media_plug_test.exs
index 07f52c8cd..7c8313121 100644
--- a/test/pleroma/web/plugs/uploaded_media_plug_test.exs
+++ b/test/pleroma/web/plugs/uploaded_media_plug_test.exs
@@ -11,7 +11,7 @@ defp upload_file(context) do
     File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
     file = %Plug.Upload{
-      content_type: "image/jpg",
+      content_type: "image/jpeg",
       path: Path.absname("test/fixtures/image_tmp.jpg"),
       filename: "nice_tf.jpg"
     }
diff --git a/test/pleroma/web/push/impl_test.exs b/test/pleroma/web/push/impl_test.exs
index 6cab46696..7d8cc999a 100644
--- a/test/pleroma/web/push/impl_test.exs
+++ b/test/pleroma/web/push/impl_test.exs
@@ -219,7 +219,7 @@ test "builds content for chat messages with no content" do
       recipient = insert(:user)
 
       file = %Plug.Upload{
-        content_type: "image/jpg",
+        content_type: "image/jpeg",
         path: Path.absname("test/fixtures/image.jpg"),
         filename: "an_image.jpg"
       }