diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4a1de5a4..1130618d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -9,6 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          key: ${{ github.job }}-${{ hashFiles('mix.lock') }}-1
+          path: _build
       - uses: erlef/setup-beam@v1
         with:
           elixir-version: 1.15.x
@@ -16,81 +20,42 @@ jobs:
       - run: mix deps.get
       - run: mix credo --strict
 
-  # dialyzer:
-  #   runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
-
-  #   steps:
-  #     - uses: actions/checkout@v2
-  #     - uses: actions/cache@v2
-  #       with:
-  #         key: ${{ github.job }}-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('mix.lock') }}-1
-  #         path: _build
-  #     - uses: erlef/setup-beam@v1
-  #       with:
-  #         elixir-version: ${{ matrix.elixir }}
-  #         otp-version: ${{ matrix.otp }}
-  #     - run: mix deps.get
-  #     - run: mix dialyzer --halt-exit-status
-
-  #   strategy:
-  #     matrix:
-  #       include:
-  #         - elixir: 1.12.x
-  #           otp: 24.x
-
-  #         - elixir: 1.12.x
-  #           otp: 25.x
-
-  #         - elixir: 1.12.x
-  #           otp: 26.x
-
-  #         - elixir: v1.13.x
-  #           otp: 24.x
-
-  #         - elixir: v1.13.x
-  #           otp: 25.x
+  dialyzer:
+    runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
 
-  #         - elixir: v1.13.x
-  #           otp: 26.x
-
-  #         - elixir: v1.14.x
-  #           otp: 24.x
-
-  #         - elixir: v1.14.x
-  #           otp: 25.x
-
-  #         - elixir: v1.14.x
-  #           otp: 26.x
-
-  #         - elixir: v1.15.x
-  #           otp: 24.x
-
-  #         - elixir: v1.15.x
-  #           otp: 25.x
-
-  #         - elixir: v1.15.x
-  #           otp: 26.x
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          key: ${{ github.job }}-${{ hashFiles('mix.lock') }}-1
+          path: _build
+      - uses: erlef/setup-beam@v1
+        with:
+          elixir-version: 1.15.x
+          otp-version: 26.x
+      - run: mix deps.get
+      - run: mix dialyzer --halt-exit-status
 
-  # test:
-  #   runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
-  #   steps:
-  #     - uses: actions/checkout@v2
-  #     - uses: actions/cache@v2
-  #       with:
-  #         key: ${{ github.job }}-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('mix.lock') }}-1
-  #         path: _build
-  #     - uses: erlef/setup-beam@v1
-  #       with:
-  #         elixir-version: ${{ matrix.elixir }}
-  #         otp-version: ${{ matrix.otp }}
-  #     - run: mix deps.get
-  #     - run: mix test
-
-  #   strategy:
-  #     matrix:
-  #       include:
-  #         - elixir: 1.12.x
-  #           otp: 24.x
+  test:
+    runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          key: ${{ github.job }}-${{ matrix.elixir }}-${{ matrix.otp }}-${{ hashFiles('mix.lock') }}-1
+          path: _build
+      - uses: erlef/setup-beam@v1
+        with:
+          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.otp }}
+      - run: mix deps.get
+      - run: mix test
+    strategy:
+      matrix:
+        include:
+          - elixir: 1.11.x
+            otp: 21.x
+            os: ubuntu-20.04
 
   #         - elixir: 1.12.x
   #           otp: 25.x