diff --git a/spec/initializers/net_http_spec.rb b/spec/initializers/net_http_spec.rb
index f19b83817f6766b434c3588fa2a1b144fd5953e4..fe76e1ff5a34d7220b3f57e4ecb5bc0810211738 100644
--- a/spec/initializers/net_http_spec.rb
+++ b/spec/initializers/net_http_spec.rb
@@ -163,7 +163,8 @@ def wait_for_server(port, timeout: 5)
       end.to raise_error(Gitlab::HTTP::InvalidResponseError, 'Invalid server response: 1xx responses not supported')
     end
 
-    it 'raises InvalidResponseError when server returns 101 Switching Protocols' do
+    it 'raises InvalidResponseError when server returns 101 Switching Protocols',
+      quarantine: 'https://gitlab.com/gitlab-org/quality/test-failure-issues/-/issues/16438' do
       expect do
         Net::HTTP.get_response(URI("http://localhost:4567/switching-protocols"))
       end.to raise_error(Gitlab::HTTP::InvalidResponseError, 'Invalid server response: 1xx responses not supported')