diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 81ca25d..d036593 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -27,6 +27,8 @@ build:
     - virtualenv-clone env /opt/make_post_sell/env
     # make tarball of virtualenv.
     - tar -zcf env.tar.gz -C /opt/make_post_sell .
+    # create sha512 of env.tar.gz
+    - sha512sum env.tar.gz >> env.tar.gz.hash
     # create commit-hash.txt to track this build's git commit hash.
     - echo $CI_COMMIT_SHA >> commit-hash.txt
     # clean up directory outside of gitlab-runner filesystem.
@@ -34,6 +36,7 @@ build:
   artifacts:
     paths:
       - env.tar.gz
+      - env.tar.gz.hash
       - static.tar.gz
       - commit-hash.txt
     #expire_in: 1 month