diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 705c6bd..cf7c5d1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,7 +44,7 @@ update:
   # load nix environment
   - git pull origin $CI_COMMIT_REF_NAME
   - . "$HOME/.nix-profile/etc/profile.d/nix.sh"
-  - nix-env -if https://github.com/zhaofengli/colmena/tarball/main
+  - nix-env -if https://github.com/zhaofengli/colmena/tarball/v0.4.0
 
 .scripts_deploy: &scripts_deploy
   # setup ssh key