diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 09ce2efd90..dab52e4c6c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,10 +26,10 @@ cache: &global_cache_policy
     - _build
 
 stages:
-  - check-changelog
   - build
   - lint
   - test
+  - check-changelog
   - benchmark
   - deploy
   - release
@@ -113,7 +113,7 @@ benchmark:
   variables:
     MIX_ENV: benchmark
   services:
-  - name: postgres:9.6-alpine
+  - name: postgres:11.22-alpine
     alias: postgres
     command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
   script:
diff --git a/changelog.d/fix-bookmark-folder-tests.skip b/changelog.d/fix-bookmark-folder-tests.skip
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/changelog.d/postgres-jit.change b/changelog.d/postgres-jit.change
new file mode 100644
index 0000000000..38225b06b0
--- /dev/null
+++ b/changelog.d/postgres-jit.change
@@ -0,0 +1 @@
+Disable jit by default for PostgreSQL
diff --git a/changelog.d/test-improvements.skip b/changelog.d/test-improvements.skip
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/changelog.d/transient-validators-defaults.change b/changelog.d/transient-validators-defaults.change
new file mode 100644
index 0000000000..225cf4d0c1
--- /dev/null
+++ b/changelog.d/transient-validators-defaults.change
@@ -0,0 +1 @@
+Set default values on validators for transient objects (attachment, poll options)
diff --git a/config/config.exs b/config/config.exs
index 6adf3386b0..a551233c06 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -831,7 +831,7 @@
 config :pleroma, configurable_from_database: false
 
 config :pleroma, Pleroma.Repo,
-  parameters: [gin_fuzzy_search_limit: "500"],
+  parameters: [gin_fuzzy_search_limit: "500", jit: "off"],
   prepare: :unnamed
 
 config :pleroma, :connections_pool,
diff --git a/config/test.exs b/config/test.exs
index 371d1e3590..6d1b7b263c 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -53,7 +53,7 @@
   hostname: System.get_env("DB_HOST") || "localhost",
   port: System.get_env("DB_PORT") || "5432",
   pool: Ecto.Adapters.SQL.Sandbox,
-  pool_size: 50
+  pool_size: System.schedulers_online() * 2
 
 config :pleroma, :dangerzone, override_repo_pool_size: true
 
diff --git a/docs/installation/debian_based_jp.md b/docs/installation/debian_based_jp.md
index 1424ad7f48..b6b5c9c078 100644
--- a/docs/installation/debian_based_jp.md
+++ b/docs/installation/debian_based_jp.md
@@ -12,8 +12,8 @@ Note: This article is potentially outdated because at this time we may not have
 
 ### 必要なソフトウェア
 
-- PostgreSQL 9.6以上 (Ubuntu16.04では9.5しか提供されていないので，[](https://www.postgresql.org/download/linux/ubuntu/)こちらから新しいバージョンを入手してください)
-- `postgresql-contrib` 9.6以上 (同上)
+- PostgreSQL 11.0以上 (Ubuntu16.04では9.5しか提供されていないので，[](https://www.postgresql.org/download/linux/ubuntu/)こちらから新しいバージョンを入手してください)
+- `postgresql-contrib` 11.0以上 (同上)
 - Elixir 1.8 以上 ([Debianのリポジトリからインストールしないこと！！！ ここからインストールすること！](https://elixir-lang.org/install.html#unix-and-unix-like)。または [asdf](https://github.com/asdf-vm/asdf) をpleromaユーザーでインストールしてください)
 - `erlang-dev`
 - `erlang-nox`
diff --git a/docs/installation/generic_dependencies.include b/docs/installation/generic_dependencies.include
index aebf21e7c7..6572716ed0 100644
--- a/docs/installation/generic_dependencies.include
+++ b/docs/installation/generic_dependencies.include
@@ -1,6 +1,6 @@
 ## Required dependencies
 
-* PostgreSQL >=9.6
+* PostgreSQL >=11.0
 * Elixir >=1.11.0 <1.15
 * Erlang OTP >=22.2.0 (supported: <27)
 * git
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index ff1c630984..10f5413868 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -122,28 +122,7 @@ def start(_type, _args) do
     max_restarts = Application.get_env(:pleroma, __MODULE__)[:max_restarts]
 
     opts = [strategy: :one_for_one, name: Pleroma.Supervisor, max_restarts: max_restarts]
-    result = Supervisor.start_link(children, opts)
-
-    set_postgres_server_version()
-
-    result
-  end
-
-  defp set_postgres_server_version do
-    version =
-      with %{rows: [[version]]} <- Ecto.Adapters.SQL.query!(Pleroma.Repo, "show server_version"),
-           {num, _} <- Float.parse(version) do
-        num
-      else
-        e ->
-          Logger.warning(
-            "Could not get the postgres version: #{inspect(e)}.\nSetting the default value of 9.6"
-          )
-
-          9.6
-      end
-
-    :persistent_term.put({Pleroma.Repo, :postgres_version}, version)
+    Supervisor.start_link(children, opts)
   end
 
   def load_custom_modules do
diff --git a/lib/pleroma/search/database_search.ex b/lib/pleroma/search/database_search.ex
index c6311e0c77..31bfc7e338 100644
--- a/lib/pleroma/search/database_search.ex
+++ b/lib/pleroma/search/database_search.ex
@@ -23,19 +23,12 @@ def search(user, search_query, options \\ []) do
     offset = Keyword.get(options, :offset, 0)
     author = Keyword.get(options, :author)
 
-    search_function =
-      if :persistent_term.get({Pleroma.Repo, :postgres_version}) >= 11 do
-        :websearch
-      else
-        :plain
-      end
-
     try do
       Activity
       |> Activity.with_preloaded_object()
       |> Activity.restrict_deactivated_users()
       |> restrict_public(user)
-      |> query_with(index_type, search_query, search_function)
+      |> query_with(index_type, search_query, :websearch)
       |> maybe_restrict_local(user)
       |> maybe_restrict_author(author)
       |> maybe_restrict_blocked(user)
diff --git a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
index 6d21db4fee..01960da831 100644
--- a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
@@ -12,13 +12,13 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator do
   @primary_key false
   embedded_schema do
     field(:id, :string)
-    field(:type, :string)
+    field(:type, :string, default: "Link")
     field(:mediaType, ObjectValidators.MIME, default: "application/octet-stream")
     field(:name, :string)
     field(:blurhash, :string)
 
     embeds_many :url, UrlObjectValidator, primary_key: false do
-      field(:type, :string)
+      field(:type, :string, default: "Link")
       field(:href, ObjectValidators.Uri)
       field(:mediaType, ObjectValidators.MIME, default: "application/octet-stream")
       field(:width, :integer)
diff --git a/lib/pleroma/web/activity_pub/object_validators/question_options_validator.ex b/lib/pleroma/web/activity_pub/object_validators/question_options_validator.ex
index 541945fa40..8d7f7b9fa6 100644
--- a/lib/pleroma/web/activity_pub/object_validators/question_options_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/question_options_validator.ex
@@ -14,10 +14,10 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.QuestionOptionsValidator do
 
     embeds_one :replies, Replies, primary_key: false do
       field(:totalItems, :integer)
-      field(:type, :string)
+      field(:type, :string, default: "Collection")
     end
 
-    field(:type, :string)
+    field(:type, :string, default: "Note")
   end
 
   def changeset(struct, data) do
diff --git a/test/pleroma/search/database_search_test.exs b/test/pleroma/search/database_search_test.exs
index 6c47ff4254..d8dd090639 100644
--- a/test/pleroma/search/database_search_test.exs
+++ b/test/pleroma/search/database_search_test.exs
@@ -35,21 +35,6 @@ test "it does not find local-only posts for anonymous users" do
     assert [] = Search.search(nil, "wednesday")
   end
 
-  test "using plainto_tsquery on postgres < 11" do
-    old_version = :persistent_term.get({Pleroma.Repo, :postgres_version})
-    :persistent_term.put({Pleroma.Repo, :postgres_version}, 10.0)
-    on_exit(fn -> :persistent_term.put({Pleroma.Repo, :postgres_version}, old_version) end)
-
-    user = insert(:user)
-    {:ok, post} = CommonAPI.post(user, %{status: "it's wednesday my dudes"})
-    {:ok, _post2} = CommonAPI.post(user, %{status: "it's wednesday my bros"})
-
-    # plainto doesn't understand complex queries
-    assert [result] = Search.search(nil, "wednesday -dudes")
-
-    assert result.id == post.id
-  end
-
   test "using websearch_to_tsquery" do
     user = insert(:user)
     {:ok, _post} = CommonAPI.post(user, %{status: "it's wednesday my dudes"})
diff --git a/test/pleroma/web/mastodon_api/controllers/search_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/search_controller_test.exs
index b05487abe4..ad4144da44 100644
--- a/test/pleroma/web/mastodon_api/controllers/search_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/search_controller_test.exs
@@ -322,26 +322,20 @@ test "search", %{conn: conn} do
     end
 
     test "search fetches remote statuses and prefers them over other results", %{conn: conn} do
-      old_version = :persistent_term.get({Pleroma.Repo, :postgres_version})
-      :persistent_term.put({Pleroma.Repo, :postgres_version}, 10.0)
-      on_exit(fn -> :persistent_term.put({Pleroma.Repo, :postgres_version}, old_version) end)
+      {:ok, %{id: activity_id}} =
+        CommonAPI.post(insert(:user), %{
+          status: "check out http://mastodon.example.org/@admin/99541947525187367"
+        })
 
-      capture_log(fn ->
-        {:ok, %{id: activity_id}} =
-          CommonAPI.post(insert(:user), %{
-            status: "check out http://mastodon.example.org/@admin/99541947525187367"
-          })
+      %{"url" => result_url, "id" => result_id} =
+        conn
+        |> get("/api/v1/search?q=http://mastodon.example.org/@admin/99541947525187367")
+        |> json_response_and_validate_schema(200)
+        |> Map.get("statuses")
+        |> List.first()
 
-        results =
-          conn
-          |> get("/api/v1/search?q=http://mastodon.example.org/@admin/99541947525187367")
-          |> json_response_and_validate_schema(200)
-
-        assert [
-                 %{"url" => "http://mastodon.example.org/@admin/99541947525187367"},
-                 %{"id" => ^activity_id}
-               ] = results["statuses"]
-      end)
+      refute match?(^result_id, activity_id)
+      assert match?(^result_url, "http://mastodon.example.org/@admin/99541947525187367")
     end
 
     test "search doesn't show statuses that it shouldn't", %{conn: conn} do
diff --git a/test/pleroma/web/pleroma_api/controllers/bookmark_folder_controller_test.ex b/test/pleroma/web/pleroma_api/controllers/bookmark_folder_controller_test.exs
similarity index 100%
rename from test/pleroma/web/pleroma_api/controllers/bookmark_folder_controller_test.ex
rename to test/pleroma/web/pleroma_api/controllers/bookmark_folder_controller_test.exs
diff --git a/test/test_helper.exs b/test/test_helper.exs
index e65f7c1d1e..a117584ae8 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -4,6 +4,8 @@
 
 Code.put_compiler_option(:warnings_as_errors, true)
 
+ExUnit.configure(max_cases: System.schedulers_online())
+
 ExUnit.start(exclude: [:federated, :erratic])
 
 if match?({:unix, :darwin}, :os.type()) do