diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 757ef85166161f78cafbf986eb4a22d7b3d418be..4498822006a5cf427b24b833399ba54c95683cc2 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -19,6 +19,7 @@ RUN rm -rf .git
 RUN apt-get install -y openjdk-11-jdk-headless
 
 ENV CPPLIB_VERSION=$CPPLIB_VERSION
+RUN echo $CPPLIB_VERSION
 
 # build and run tests
 CMD ls -la && \