diff --git a/.forgejo/workflows/build.yml b/.forgejo/workflows/build.yml
index 8e6ecc9..a6dc447 100644
--- a/.forgejo/workflows/build.yml
+++ b/.forgejo/workflows/build.yml
@@ -70,6 +70,8 @@ jobs:
 
       - run: helm plugin install --version ${{ env.HELM_UNITTEST_VERSION }} https://github.com/helm-unittest/helm-unittest
 
+      - uses: sigstore/cosign-installer@11086d25041f77fe8fe7b9ea4e48e3b9192b8f19 # v3.1.2
+
       - name: install chart-testing
         uses: helm/chart-testing-action@e6669bcd63d7cb57cb4380c33043eebe5d111992 # v2.6.1
         with:
@@ -154,6 +156,8 @@ jobs:
       #     rm "chart-testing_${HELM_CHART_TESTING_VERSION#v}_linux_amd64.tar.gz"
       #     ct --version
 
+      - uses: sigstore/cosign-installer@11086d25041f77fe8fe7b9ea4e48e3b9192b8f19 # v3.1.2
+
       - name: Install chart-testing
         uses: helm/chart-testing-action@e6669bcd63d7cb57cb4380c33043eebe5d111992 # v2.6.1
         with: