diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ee13904f..8a8798e8c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,6 +40,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Mastodon API: Support for `include_types` in `/api/v1/notifications`.
 - Mastodon API: Added `/api/v1/notifications/:id/dismiss` endpoint.
 - Mastodon API: Add support for filtering replies in public and home timelines
+- Mastodon API: Support for `bot` field in `/api/v1/accounts/update_credentials`
 - Admin API: endpoints for create/update/delete OAuth Apps.
 - Admin API: endpoint for status view.
 - OTP: Add command to reload emoji packs
diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index f0ccc7c79..ae4f96aac 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -465,6 +465,7 @@ def update_changeset(struct, params \\ %{}) do
     |> validate_format(:nickname, local_nickname_regex())
     |> validate_length(:bio, max: bio_limit)
     |> validate_length(:name, min: 1, max: name_limit)
+    |> validate_inclusion(:actor_type, ["Person", "Service"])
     |> put_fields()
     |> put_emoji()
     |> put_change_if_present(:bio, &{:ok, parse_bio(&1, struct)})
diff --git a/lib/pleroma/web/mastodon_api/controllers/account_controller.ex b/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
index c38c2b895..adbbac624 100644
--- a/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
@@ -177,6 +177,9 @@ def update_credentials(%{assigns: %{user: user}, body_params: params} = conn, _p
       |> Maps.put_if_present(:pleroma_settings_store, params[:pleroma_settings_store])
       |> Maps.put_if_present(:default_scope, params[:default_scope])
       |> Maps.put_if_present(:default_scope, params["source"]["privacy"])
+      |> Maps.put_if_present(:actor_type, params[:bot], fn bot ->
+        if bot, do: {:ok, "Service"}, else: {:ok, "Person"}
+      end)
       |> Maps.put_if_present(:actor_type, params[:actor_type])
 
     changeset = User.update_changeset(user, user_params)
diff --git a/lib/pleroma/web/mastodon_api/views/account_view.ex b/lib/pleroma/web/mastodon_api/views/account_view.ex
index 68beb69b8..6c40b8ccd 100644
--- a/lib/pleroma/web/mastodon_api/views/account_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/account_view.ex
@@ -179,7 +179,7 @@ defp do_render("show.json", %{user: user} = opts) do
         0
       end
 
-    bot = user.actor_type in ["Application", "Service"]
+    bot = user.actor_type == "Service"
 
     emojis =
       Enum.map(user.emoji, fn {shortcode, raw_url} ->
diff --git a/test/web/mastodon_api/controllers/account_controller/update_credentials_test.exs b/test/web/mastodon_api/controllers/account_controller/update_credentials_test.exs
index 76e6d603a..f67d294ba 100644
--- a/test/web/mastodon_api/controllers/account_controller/update_credentials_test.exs
+++ b/test/web/mastodon_api/controllers/account_controller/update_credentials_test.exs
@@ -400,4 +400,71 @@ test "update fields when invalid request", %{conn: conn} do
                |> json_response_and_validate_schema(403)
     end
   end
+
+  describe "Mark account as bot" do
+    setup do: oauth_access(["write:accounts"])
+    setup :request_content_type
+
+    test "changing actor_type to Service makes account a bot", %{conn: conn} do
+      account =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{actor_type: "Service"})
+        |> json_response_and_validate_schema(200)
+
+      assert account["bot"]
+      assert account["source"]["pleroma"]["actor_type"] == "Service"
+    end
+
+    test "changing actor_type to Person makes account a human", %{conn: conn} do
+      account =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{actor_type: "Person"})
+        |> json_response_and_validate_schema(200)
+
+      refute account["bot"]
+      assert account["source"]["pleroma"]["actor_type"] == "Person"
+    end
+
+    test "changing actor_type to Application causes error", %{conn: conn} do
+      response =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{actor_type: "Application"})
+        |> json_response_and_validate_schema(403)
+
+      assert %{"error" => "Invalid request"} == response
+    end
+
+    test "changing bot field to true changes actor_type to Service", %{conn: conn} do
+      account =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{bot: "true"})
+        |> json_response_and_validate_schema(200)
+
+      assert account["bot"]
+      assert account["source"]["pleroma"]["actor_type"] == "Service"
+    end
+
+    test "changing bot field to false changes actor_type to Person", %{conn: conn} do
+      account =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{bot: "false"})
+        |> json_response_and_validate_schema(200)
+
+      refute account["bot"]
+      assert account["source"]["pleroma"]["actor_type"] == "Person"
+    end
+
+    test "actor_type field has a higher priority than bot", %{conn: conn} do
+      account =
+        conn
+        |> patch("/api/v1/accounts/update_credentials", %{
+          actor_type: "Person",
+          bot: "true"
+        })
+        |> json_response_and_validate_schema(200)
+
+      refute account["bot"]
+      assert account["source"]["pleroma"]["actor_type"] == "Person"
+    end
+  end
 end