diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index a609795..38c7363 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -135,6 +135,12 @@ jobs:
           persist-credentials: false
           ref: ${{ inputs.ref || github.ref }}
 
+      - name: Cache npm
+        uses: actions/cache@v5
+        with:
+          path: ~/.npm
+          key: npm-${{ runner.os }}-markdownlint-cli2-${{ env.MARKDOWNLINT_CLI2_VERSION }}
+
       - name: Lint Markdown
         run: npx --yes "markdownlint-cli2@${MARKDOWNLINT_CLI2_VERSION}"