diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index dd7aeb28..5caf8d1f 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -10,9 +10,20 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: "11.x"
+          node-version: "12.x"
+      - name: Cache node modules
+        uses: actions/cache@v1
+        env:
+          cache-name: cache-solidity-node-modules
+        with:
+          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
       - name: Install dependencies
-        run: npm install
+        run: npm ci
       - name: Run JS linter
         run: npm run lint:js
 
@@ -23,8 +34,19 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: "11.x"
+          node-version: "12.x"
+      - name: Cache node modules
+        uses: actions/cache@v1
+        env:
+          cache-name: cache-solidity-node-modules
+        with:
+          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
       - name: Install dependencies
-        run: npm install
+        run: npm ci
       - name: Run Solidity linter
         run: npm run lint:sol
diff --git a/.github/workflows/solidity-test.yml b/.github/workflows/solidity-test.yml
index 4c865d50..483bc86e 100644
--- a/.github/workflows/solidity-test.yml
+++ b/.github/workflows/solidity-test.yml
@@ -10,9 +10,20 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: "11.x"
+          node-version: "12.x"
+      - name: Cache node modules
+        uses: actions/cache@v1
+        env:
+          cache-name: cache-solidity-node-modules
+        with:
+          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
       - name: Install dependencies
-        run: npm install
+        run: npm ci
       - name: Run tests
         # Runs ganache in background
         run: |