diff --git a/docker-compose.yml b/docker-compose.yml
index 9ca6ada..53bfa95 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -111,6 +111,7 @@ services:
           - INSTALL_MC=${WORKSPACE_INSTALL_MC}
           - INSTALL_SYMFONY=${WORKSPACE_INSTALL_SYMFONY}
           - INSTALL_PYTHON=${WORKSPACE_INSTALL_PYTHON}
+          - INSTALL_PYTHON3=${WORKSPACE_INSTALL_PYTHON3}
           - INSTALL_IMAGE_OPTIMIZERS=${WORKSPACE_INSTALL_IMAGE_OPTIMIZERS}
           - INSTALL_IMAGEMAGICK=${WORKSPACE_INSTALL_IMAGEMAGICK}
           - INSTALL_TERRAFORM=${WORKSPACE_INSTALL_TERRAFORM}