diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f057676..64de1e8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,7 +49,7 @@ jobs:
       - name: Run behavior tests
         run: bundle exec cucumber
       - name: Build gem
-        run: gem build --verbose *.gemspec
+        run: gem build --strict --verbose *.gemspec
   tests:
     needs:
       - rubocop
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index cf05d97..8b79d99 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -18,7 +18,7 @@ jobs:
         env:
           BUNDLE_WITHOUT: release
       - name: Build gem
-        run: gem build --verbose *.gemspec
+        run: gem build --strict --verbose *.gemspec
       - name: Publish gem to rubygems.org
         run: gem push *.gem
         env: