diff --git a/src/variations/unit/Dockerfile b/src/variations/unit/Dockerfile
index 1a1f4128..6201bb70 100644
--- a/src/variations/unit/Dockerfile
+++ b/src/variations/unit/Dockerfile
@@ -140,6 +140,9 @@ RUN docker-php-serversideup-dep-install-alpine "${DEPENDENCY_PACKAGES_ALPINE}" &
     chown -R www-data:www-data /var/www && \
     chmod -R 755 /var/www && \
     \
+    # Set the image version
+    echo "${REPOSITORY_BUILD_VERSION}" > /etc/serversideup-php-version && \
+    \
     # Make composer cache directory
     mkdir -p "${COMPOSER_HOME}" && \
     chown -R www-data:www-data "${COMPOSER_HOME}" && \