diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c3613d75..c8fd6af9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -25,7 +25,17 @@ jobs:
 
       # Build and test Multinet server.
       - run: pip install pipenv
-      - run: pipenv install --dev --deploy
+
+      - uses: actions/cache@v1
+        id: multinet-cache
+        with:
+          path: /home/runner/.local/share/virtualenvs/
+          key: ${{ runner.os }}-${{ hashFiles('/home/runner/work/multinet/multinet/Pipfile.lock') }}-pipenv-cache-1
+      
+      - name: Install pipenv packages
+        if: steps.multinet-cache.outputs.cache-hit != 'true'
+        run: pipenv install --dev --deploy
+
       - run: pipenv run lint
       - run: pipenv run format
       - run: pipenv run typecheck
@@ -35,7 +45,17 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           node-version: '10.x'
-      - run: cd client && yarn install
+
+      - uses: actions/cache@v1
+        id: client-cache
+        with:
+          path: /home/runner/work/multinet/multinet/client/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('/home/runner/work/multinet/multinet/client/yarn.lock') }}-client-cache
+
+      - name: Install yarn packages
+        if: steps.client-cache.outputs.cache-hit != 'true'
+        run: cd client && yarn install
+
       - run: cd client && yarn lint
       - run: cd client && yarn lint:test
       - run: pipenv run test-server-up
@@ -44,7 +64,16 @@ jobs:
       - run: cd client && yarn build
 
       # Build and test Multinet client library.
-      - run: cd multinetjs && yarn install
+      - uses: actions/cache@v1
+        id: multinetjs-cache
+        with:
+          path: /home/runner/work/multinet/multinet/multinetjs/node_modules
+          key: ${{ runner.os }}-${{ hashFiles('/home/runner/work/multinet/multinet/multinetjs/yarn.lock') }}-multinetjs-cache
+
+      - name: Install yarn packages
+        if: steps.multinetjs-cache.outputs.cache-hit != 'true'
+        run: cd multinetjs && yarn install
+
       - run: cd multinetjs && yarn build
       - run: cd multinetjs && yarn lint
       - run: cd multinetjs && yarn test