diff --git a/.github/actions/setup-ci/action.yaml b/.github/actions/setup-ci/action.yaml
index 975bc3c483..f9b714e6ca 100644
--- a/.github/actions/setup-ci/action.yaml
+++ b/.github/actions/setup-ci/action.yaml
@@ -1,6 +1,6 @@
 ---
-name: "Setup CI environment"
-description: "Setup Cloudserver CI environment"
+name: 'Setup CI environment'
+description: 'Setup Cloudserver CI environment'
 
 runs:
   using: composite
@@ -28,12 +28,23 @@ runs:
     - uses: actions/setup-node@v4
       with:
         node-version: '22.23.1'
-        cache: 'yarn'
+    # Cache node_modules directly (not the yarn download cache) so the git
+    # dependencies' TypeScript compilation and relink are skipped on a hit.
+    # Key includes runner.os because node_modules can hold native addons; all
+    # CI runners are Linux/ubuntu, so the cache stays homogeneous.
+    - name: Cache node_modules
+      id: cache-node-modules
+      uses: actions/cache@v4
+      with:
+        path: node_modules
+        key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock') }}
     - name: install typescript
       shell: bash
+      if: steps.cache-node-modules.outputs.cache-hit != 'true'
       run: yarn global add typescript@4.9.5
     - name: install dependencies
       shell: bash
+      if: steps.cache-node-modules.outputs.cache-hit != 'true'
       run: yarn install --ignore-engines --frozen-lockfile --network-concurrency 1
     - uses: actions/cache@v3
       with:
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index d775a2b8d1..de269449ef 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -86,11 +86,18 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: '22.23.1'
-          cache: yarn
+      - name: Cache node_modules
+        id: cache-node-modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock') }}
       - name: install typescript
         shell: bash
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: yarn global add typescript@4.9.5
       - name: install dependencies
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: yarn install --frozen-lockfile --network-concurrency 1
       - uses: actions/setup-python@v5
         with:
@@ -127,8 +134,14 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: '22.23.1'
-          cache: yarn
+      - name: Cache node_modules
+        id: cache-node-modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock') }}
       - name: install dependencies
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: yarn install --frozen-lockfile --network-concurrency 1
       - name: Count async/await migration progress
         run: yarn run count-async
@@ -141,11 +154,18 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: '22.23.1'
-          cache: yarn
+      - name: Cache node_modules
+        id: cache-node-modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock') }}
       - name: install typescript
         shell: bash
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: yarn global add typescript@4.9.5
       - name: install dependencies
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: yarn install --frozen-lockfile --network-concurrency 1
       - name: Unit Coverage
         run: |
@@ -1089,8 +1109,14 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: '22.23.1'
-          cache: yarn
+      - name: Cache node_modules
+        id: cache-node-modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock') }}
       - name: Install dependencies
+        if: steps.cache-node-modules.outputs.cache-hit != 'true'
         run: yarn install --frozen-lockfile --network-concurrency 1
       - name: Delete stale GCP CI buckets
         run: yarn run cleanup_gcp_buckets