diff --git a/testing/matrix-sdk-integration-testing/assets/Dockerfile b/testing/matrix-sdk-integration-testing/assets/Dockerfile
index b68b2519096..cb214e69a12 100644
--- a/testing/matrix-sdk-integration-testing/assets/Dockerfile
+++ b/testing/matrix-sdk-integration-testing/assets/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/matrixdotorg/synapse:latest
+FROM docker.io/matrixdotorg/synapse:v1.114.0
 ADD ci-start.sh /ci-start.sh
 RUN chmod 770 /ci-start.sh
 ENTRYPOINT /ci-start.sh
diff --git a/testing/matrix-sdk-integration-testing/assets/ci-start.sh b/testing/matrix-sdk-integration-testing/assets/ci-start.sh
index fb41f9735b6..2c7e9b3efdd 100644
--- a/testing/matrix-sdk-integration-testing/assets/ci-start.sh
+++ b/testing/matrix-sdk-integration-testing/assets/ci-start.sh
@@ -59,7 +59,6 @@ rc_invites:
 
 experimental_features:
  msc3266_enabled: true
- msc4186_enabled: true
 """ >>  /data/homeserver.yaml
 
 echo " ====== Starting server with:  ====== "