diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66a1d03..cf6fbe8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - allow "room_id" to be passed as a parameter or with the data
 - rename "text" to "body".
 - Publish releases also on github from github actions
+- fixed tests for recent synapse docker image
 
 ## [3.1.1] - 2021-07-18
 
diff --git a/tests/Dockerfile b/tests/Dockerfile
index 42b60b9..09c8b05 100644
--- a/tests/Dockerfile
+++ b/tests/Dockerfile
@@ -4,7 +4,7 @@ FROM matrixdotorg/synapse
 
 # The config dir defaults to /data which is a volume made to keep data.
 # Here, we want to trash those (and avoid the permission issues) by using something else
-ENV SYNAPSE_CONFIG_DIR=/srv SYNAPSE_SERVER_NAME=tests SYNAPSE_REPORT_STATS=no
+ENV SYNAPSE_CONFIG_DIR=/srv SYNAPSE_DATA_DIR=/srv SYNAPSE_SERVER_NAME=tests SYNAPSE_REPORT_STATS=no
 
 # Generate configuration and keys for synapse
 WORKDIR $SYNAPSE_CONFIG_DIR