diff --git a/.github/workflows/annocheck.yml b/.github/workflows/annocheck.yml
index bc72d751e20549..3cf18c504602d2 100644
--- a/.github/workflows/annocheck.yml
+++ b/.github/workflows/annocheck.yml
@@ -104,6 +104,8 @@ jobs:
 
       ### test-spec doesn't work: https://github.com/ruby/ruby/actions/runs/4340193212/jobs/7578505652
       # - run: make test-spec
+      #   env:
+      #     CHECK_LEAKS: true
 
       - run: make test-annocheck
 
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index 48c1ecc21c010b..27f8af38b824f9 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -276,6 +276,8 @@ jobs:
         if: ${{ matrix.entry.check }}
 
       - run: make test-spec
+        env:
+          CHECK_LEAKS: true
         if: ${{ matrix.entry.check }}
 
       - run: make test-annocheck
diff --git a/.github/workflows/spec_guards.yml b/.github/workflows/spec_guards.yml
index 248497041a06df..19f1a67803b579 100644
--- a/.github/workflows/spec_guards.yml
+++ b/.github/workflows/spec_guards.yml
@@ -54,6 +54,8 @@ jobs:
 
       - run: ruby ../mspec/bin/mspec
         working-directory: spec/ruby
+        env:
+          CHECK_LEAKS: true
 
       - uses: ./.github/actions/slack
         with: