diff --git a/assets/build/install.sh b/assets/build/install.sh
index 6b4b9c2d..2c91560d 100755
--- a/assets/build/install.sh
+++ b/assets/build/install.sh
@@ -386,3 +386,6 @@ EOF
 # purge build dependencies and cleanup apt
 DEBIAN_FRONTEND=noninteractive apt-get purge -y --auto-remove ${BUILD_DEPENDENCIES}
 rm -rf /var/lib/apt/lists/*
+
+# clean up caches
+exec_as_git rm -rf ${GITLAB_HOME}/.cache