diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 440f0b8..efe4a9f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,60 +7,41 @@ on:
       - master
 
 jobs:
-  mix_test:
-    name: mix test (Elixir ${{matrix.elixir}} | Erlang/OTP ${{matrix.otp}})
-    runs-on: ubuntu-latest
+  test:
+    runs-on: ubuntu-16.04
+    env:
+      MIX_ENV: test
     strategy:
       fail-fast: false
       matrix:
         include:
-          - elixir: 1.5.3
-            otp: 20.3.8.26
-          - elixir: 1.6.6
-            otp: 20.3.8.26
-          - elixir: 1.7.4
-            otp: 20.3.8.26
-          - elixir: 1.8.2
-            otp: 20.3.8.26
-          - elixir: 1.9.4
-            otp: 20.3.8.26
-          - elixir: 1.10.4
-            otp: 23.0.3
+          - pair:
+              elixir: 1.5.3
+              otp: 19.3.6.13
+          - pair:
+              elixir: 1.11.3
+              otp: 23.2.5
+            lint: lint
     steps:
       - uses: actions/checkout@v2
+
       - uses: erlef/setup-elixir@v1
         with:
-          otp-version: ${{matrix.otp}}
-          elixir-version: ${{matrix.elixir}}
+          otp-version: ${{matrix.pair.otp}}
+          elixir-version: ${{matrix.pair.elixir}}
+
       - name: Install Dependencies
-        run: |
-          mix local.hex --force
-          mix deps.get --only test
-      - run: mix test
+        run: mix deps.get --only test
 
-  check_formatted:
-    name: Check formatted
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: erlef/setup-elixir@v1
-        with:
-          otp-version: 23.0.3
-          elixir-version: 1.10.4
       - run: mix format --check-formatted
+        if: ${{ matrix.lint }}
 
-  compile_without_warnings:
-    name: Compile without warnings
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: erlef/setup-elixir@v1
-        with:
-          otp-version: 22.3.4.5
-          elixir-version: 1.9.4 # not 1.10 as its --warnigs-as-errors has bugs https://github.com/elixir-lang/elixir/issues/10073
-      - name: Install Dependencies
-        run: |
-          mix local.hex --force
-          mix deps.get
-      - name: Compile without warnings
-        run: mix compile --warnings-as-errors
+      - run: mix deps.get && mix deps.unlock --check-unused
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.compile
+
+      - run: mix compile --warnings-as-errors
+        if: ${{ matrix.lint }}
+
+      - run: mix test
diff --git a/mix.lock b/mix.lock
index 95b5c79..347c063 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,5 +1,4 @@
 %{
-  "earmark": {:hex, :earmark, "1.4.3", "364ca2e9710f6bff494117dbbd53880d84bebb692dafc3a78eb50aa3183f2bfd", [:mix], [], "hexpm", "8cf8a291ebf1c7b9539e3cddb19e9cef066c2441b1640f13c34c1d3cfc825fec"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.10", "6603d7a603b9c18d3d20db69921527f82ef09990885ed7525003c7fe7dc86c56", [:mix], [], "hexpm", "8e2d5370b732385db2c9b22215c3f59c84ac7dda7ed7e544d7c459496ae519c0"},
   "ex_doc": {:hex, :ex_doc, "0.22.6", "0fb1e09a3e8b69af0ae94c8b4e4df36995d8c88d5ec7dbd35617929144b62c00", [:mix], [{:earmark_parser, "~> 1.4.0", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm", "1e0aceda15faf71f1b0983165e6e7313be628a460e22a031e32913b98edbd638"},
   "makeup": {:hex, :makeup, "1.0.3", "e339e2f766d12e7260e6672dd4047405963c5ec99661abdc432e6ec67d29ef95", [:mix], [{:nimble_parsec, "~> 0.5", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "2e9b4996d11832947731f7608fed7ad2f9443011b3b479ae288011265cdd3dad"},