diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cc8bbbb..fd62e7c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,12 @@ check-fmt:
   script:
     - nix-shell --run "make fmt && git diff --quiet"
 
+check-gomod:
+  stage: format
+  image: nixos/nix:latest
+  script:
+    - nix-shell --run "go mod tidy && git diff --quiet"
+
 run-tests:
   stage: test
   image: nixos/nix:latest