diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 956a017d18f9e26dc265d3900432ee4995a6bcb5..d0432284983fd937ff731e0c67be3ac35b551170 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -18,8 +18,6 @@ RUN rm -rf .git
 
 RUN apt-get install -y openjdk-11-jdk-headless
 
-ENV ENV_CPPLIB_VERSION=$CPPLIB_VERSION
-RUN echo $ENV_CPPLIB_VERSION
 
 # build and run tests
 CMD ls -la && \
diff --git a/.docker/tester.yml b/.docker/tester.yml
index 1673eed239866d774a570c752c984e7fc35cc0df..be57831a0c8a8b1d10aca196ac46eaa142392f25 100644
--- a/.docker/tester.yml
+++ b/.docker/tester.yml
@@ -4,6 +4,8 @@ services:
     image: "$CPPINTTEST_REGISTRY_IMAGE"
     networks:
       - docker_caosnet
+    environment:
+      - ENV_CPPLIB_VERSION: $CPPLIB_VERSION
     volumes:
       - type: bind
         source: ./cert