diff --git a/scripts/gazelle.sh b/scripts/gazelle.sh
index 12c60bc..d6e7cee 100755
--- a/scripts/gazelle.sh
+++ b/scripts/gazelle.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 # gazelle.sh regenerates BUILD.bazel files for Go source files.
+set -euo pipefail
 
+bazel run //:go mod tidy
 bazel run //:gazelle -- update
 bazel run //:gazelle -- update-repos -from_file=go.mod -to_macro=repositories.bzl%go_repositories -prune=true