diff --git a/lib/mobilizon/cli.ex b/lib/mobilizon/cli.ex
index 56016063c..fe032a841 100644
--- a/lib/mobilizon/cli.ex
+++ b/lib/mobilizon/cli.ex
@@ -44,12 +44,12 @@ defmodule Mobilizon.CLI do
     end
   end
 
-  @spec migrate(String.t()) :: any()
+  @spec migrate(any()) :: any()
   defp migrate(args) do
     Migrate.run(args)
   end
 
-  @spec rollback(String.t()) :: any()
+  @spec rollback(any()) :: any()
   defp rollback(args) do
     Rollback.run(args)
   end
diff --git a/lib/service/http/activity_pub.ex b/lib/service/http/activity_pub.ex
index 57e4ea832..a84b28a89 100644
--- a/lib/service/http/activity_pub.ex
+++ b/lib/service/http/activity_pub.ex
@@ -28,12 +28,12 @@ defmodule Mobilizon.Service.HTTP.ActivityPub do
     Tesla.client(middleware, {adapter, opts})
   end
 
-  @spec get(Tesla.Client.t(), String.t()) :: Tesla.Env.t()
+  @spec get(Tesla.Client.t(), String.t()) :: Tesla.Env.result()
   def get(client, url) do
     Tesla.get(client, url)
   end
 
-  @spec post(Tesla.Client.t(), String.t(), map() | String.t()) :: Tesla.Env.t()
+  @spec post(Tesla.Client.t(), String.t(), map() | String.t()) :: Tesla.Env.result()
   def post(client, url, data) do
     Tesla.post(client, url, data)
   end
diff --git a/lib/service/rich_media/parsers/twitter_card.ex b/lib/service/rich_media/parsers/twitter_card.ex
index 6d2d5297d..70740d162 100644
--- a/lib/service/rich_media/parsers/twitter_card.ex
+++ b/lib/service/rich_media/parsers/twitter_card.ex
@@ -25,19 +25,29 @@ defmodule Mobilizon.Service.RichMedia.Parsers.TwitterCard do
     Logger.debug("Using Twitter card parser")
 
     with {:ok, data} <- parse_name_attrs(data, html),
-         {:ok, data} <- parse_property_attrs(data, html),
-         data <- transform_tags(data) do
+         {:ok, data} <- parse_property_attrs(data, html) do
+      data = transform_tags(data)
       Logger.debug("Data found with Twitter card parser")
       Logger.debug(inspect(data))
       data
     end
   end
 
+  @spec parse_name_attrs(map(), String.t()) :: {:ok, map()} | {:error, String.t()}
   defp parse_name_attrs(data, html) do
-    MetaTagsParser.parse(html, data, "twitter", %{}, :name, :content, [:"twitter:card"])
+    MetaTagsParser.parse(
+      html,
+      data,
+      "twitter",
+      "No twitter card metadata found",
+      :name,
+      :content,
+      [:"twitter:card"]
+    )
   end
 
-  defp parse_property_attrs({_, data}, html) do
+  @spec parse_property_attrs(map(), String.t()) :: {:ok, map()} | {:error, String.t()}
+  defp parse_property_attrs(data, html) do
     MetaTagsParser.parse(
       html,
       data,
@@ -49,6 +59,7 @@ defmodule Mobilizon.Service.RichMedia.Parsers.TwitterCard do
     )
   end
 
+  @spec transform_tags(map()) :: map()
   defp transform_tags(data) do
     data
     |> Enum.reject(fn {_, v} -> is_nil(v) end)
diff --git a/lib/web/controllers/feed_controller.ex b/lib/web/controllers/feed_controller.ex
index cf4646263..8e8e2b221 100644
--- a/lib/web/controllers/feed_controller.ex
+++ b/lib/web/controllers/feed_controller.ex
@@ -30,7 +30,6 @@ defmodule Mobilizon.Web.FeedController do
     return_data(conn, "ics", "event_" <> uuid, "event")
   end
 
-  @spec instance(Plug.Conn.t(), map()) :: Plug.Conn.t()
   def event(_conn, _) do
     {:error, :not_found}
   end