diff --git a/docker-compose.yml b/docker-compose.yml
index c2032191..7541caea 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -40,6 +40,7 @@ services:
       - SSLKEYLOGFILE=/logs/keys.log
       - QLOGDIR=/logs/qlog/
       - TESTCASE=$TESTCASE_SERVER
+      - VERSION=$VERSION
     depends_on:
       - sim
     cap_add: 
@@ -68,6 +69,7 @@ services:
       - QLOGDIR=/logs/qlog/
       - TESTCASE=$TESTCASE_CLIENT
       - REQUESTS=$REQUESTS
+      - VERSION=$VERSION
     depends_on:
       - sim
     cap_add: 
diff --git a/interop.py b/interop.py
index 6ad191cd..4dea51d3 100644
--- a/interop.py
+++ b/interop.py
@@ -352,6 +352,7 @@ def _run_test(
             "CLIENT=" + self._implementations[client]["image"] + " "
             "SERVER=" + self._implementations[server]["image"] + " "
             'REQUESTS="' + reqs + '" '
+            'VERSION="' + testcases.QUIC_VERSION + '" '
         ).format(testcase.scenario())
         params += " ".join(testcase.additional_envs())
         containers = "sim client server " + " ".join(testcase.additional_containers())