diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bcfb00eaa4d05fafcdd2468c86832f5c7617db98..0294ae27c5c30c9e83289d5f84a01214f581eaeb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ image: docker:19.03.1
 variables:
   DOCKER_TLS_CERTDIR: "/certs"
   IMAGE_TAG: $CI_REGISTRY_IMAGE
-  IMAGE_VER: 1.5.1
+  IMAGE_VER: 1.5.2
 
 services:
   - docker:19.03.1-dind
diff --git a/lib/CF/Controller/Websockets.pm b/lib/CF/Controller/Websockets.pm
index e40237b039bc7181d7fad3c5992be459d78377f9..cd22a9120f0c89cf6af45a3a1c20b6bde6b2a55c 100644
--- a/lib/CF/Controller/Websockets.pm
+++ b/lib/CF/Controller/Websockets.pm
@@ -19,6 +19,7 @@ sub main {
 
     if ($c->req->headers->header('Sec-WebSocket-Extensions') =~ /permessage-deflate/) {
         $c->tx->compressed(1);
+        $c->res->headers->add('Sec-WebSocket-Extensions' => 'permessage-deflate');
     }
 
     my $pubsub = Mojo::Pg::PubSub->new(pg => $c->pg);