diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 871ab08..7105da1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,6 +33,24 @@ jobs:
         with:
           node-version: '24'
 
+      - name: Cache npm (Linux/macOS)
+        if: runner.os != 'Windows'
+        uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: npm-${{ runner.os }}-node-24-${{ hashFiles('package.json') }}
+          restore-keys: |
+            npm-${{ runner.os }}-node-24-
+
+      - name: Cache npm (Windows)
+        if: runner.os == 'Windows'
+        uses: actions/cache@v4
+        with:
+          path: ~\AppData\Local\npm-cache
+          key: npm-${{ runner.os }}-node-24-${{ hashFiles('package.json') }}
+          restore-keys: |
+            npm-${{ runner.os }}-node-24-
+
       - name: Install root deps (no scripts)
         run: npm install --ignore-scripts --no-audit --no-fund