diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 55b40578..3dccad38 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,99 +21,114 @@ jobs:
   integration_test:
     name: >
       Pre-release integration tests
-      (Erlang/OTP ${{matrix.pair.otp-version}},
-       Elixir ${{matrix.pair.elixir-version}},
-       rebar3 ${{matrix.pair.rebar3-version}})
-    runs-on: ubuntu-18.04
+      (Ubuntu ${{matrix.combo.os}},
+       Erlang/OTP ${{matrix.combo.otp-version}},
+       Elixir ${{matrix.combo.elixir-version}},
+       rebar3 ${{matrix.combo.rebar3-version}})
+    runs-on: ${{matrix.combo.os}}
     strategy:
       fail-fast: false
       matrix:
-        pair:
-          # Full Versions
-          - otp-version: '22.0'
-            elixir-version: '1.9.1'
-          - otp-version: '22.3.4'
-            rebar3-version: '3.14.4'
-          # Semver ranges
-          - otp-version: '21.x'
-            elixir-version: '<1.9.1'
-          - otp-version: '21.x'
-            rebar3-version: '3.14.4'
-          # Branches
-          - otp-version: '22.0'
-            elixir-version: master
-          - otp-version: 'master'
-            elixir-version: '1.11.3'
-          # Pre-releases
-          - otp-version: '23.0'
-            elixir-version: '1.11.0-rc.0'
-          # Fallback to Elixir (with no OTP)
-          - otp-version: '24.0-rc1'
-            elixir-version: '1.9.3'
-          # Miscellaneous combos
-          - elixir-version: 'master'
-            otp-version: '22.3'
-          - elixir-version: 'master'
+        combo:
+          - elixir-version: 'v1.0'
+            otp-version: '17'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.0'
+            otp-version: '17'
+            os: 'ubuntu-18.04'
+          - elixir-version: 'v1.1'
+            otp-version: '18'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.1'
+            otp-version: '18'
+            os: 'ubuntu-18.04'
+          - elixir-version: 'v1.2'
+            otp-version: '19'
+            rebar3-version: '3.10'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.2'
+            otp-version: '19'
+            rebar3-version: '3.10'
+            os: 'ubuntu-18.04'
+          - elixir-version: 'v1.4'
+            otp-version: '20'
+            rebar3-version: '3.11'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.4'
+            otp-version: '20'
+            rebar3-version: '3.11'
+            os: 'ubuntu-18.04'
+          - elixir-version: 'v1.4'
+            otp-version: '20'
+            rebar3-version: '3.11'
+            os: 'ubuntu-20.04'
+          - elixir-version: 'v1.6'
+            otp-version: '21'
+            rebar3-version: '3.12'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.6'
+            otp-version: '21'
+            rebar3-version: '3.12'
+            os: 'ubuntu-18.04'
+          - elixir-version: 'v1.6'
+            otp-version: '21'
+            rebar3-version: '3.12'
+            os: 'ubuntu-20.04'
+          - elixir-version: 'v1.7'
             otp-version: '22'
-          - elixir-version: 'master'
-            otp-version: '^22'
-          - elixir-version: 'master'
+            rebar3-version: '3.13'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.7'
             otp-version: '22'
-          - elixir-version: '1.6.5'
-            otp-version: 'maint-21'
-          - elixir-version: 'v1.6.5'
-            otp-version: 'maint-21'
-          - elixir-version: 'v1.9.x'
-            otp-version: '21.1'
-          - elixir-version: '1.9.x'
-            otp-version: '21'
-          - elixir-version: 'v1.8.x'
+            rebar3-version: '3.13'
+            os: 'ubuntu-18.04'
+          - elixir-version: 'v1.7'
             otp-version: '22'
-          - elixir-version: 'v1.8.x'
-            otp-version: '23.1'
-          - elixir-version: 'v1.8'
-            otp-version: '^22.3'
+            rebar3-version: '3.13'
+            os: 'ubuntu-20.04'
+          - elixir-version: 'v1.10'
+            otp-version: '23'
+            rebar3-version: '3.14'
+            os: 'ubuntu-16.04'
+          - elixir-version: 'v1.10'
+            otp-version: '23'
+            rebar3-version: '3.14'
+            os: 'ubuntu-18.04'
           - elixir-version: 'v1.10'
-            otp-version: '21.x'
-          - elixir-version: 'v1.x'
-            otp-version: 'master'
-          - elixir-version: 'v1.11.0-rc.0'
             otp-version: '23'
-          - elixir-version: 'v1.11.0-rc.0'
-            otp-version: '23.0'
-          - elixir-version: 'v1.11.0-rc.0'
-            otp-version: 'master'
+            rebar3-version: '3.14'
+            os: 'ubuntu-20.04'
     steps:
       - uses: actions/checkout@v2
       - name: Use erlef/setup-beam
         id: setup-beam
         uses: ./
         with:
-          otp-version: ${{matrix.pair.otp-version}}
-          elixir-version: ${{matrix.pair.elixir-version}}
-          rebar3-version: ${{matrix.pair.rebar3-version}}
+          otp-version: ${{matrix.combo.otp-version}}
+          elixir-version: ${{matrix.combo.elixir-version}}
+          rebar3-version: ${{matrix.combo.rebar3-version}}
       - name: Erlang/OTP version (action)
         run: echo "Erlang/OTP ${{steps.setup-beam.outputs.otp-version}}"
       - name: Elixir version (action)
         run: echo "Elixir ${{steps.setup-beam.outputs.elixir-version}}"
-        if: ${{matrix.pair.elixir-version}}
+        if: ${{matrix.combo.elixir-version}}
       - name: rebar3 version (action)
         run: echo "rebar3 ${{steps.setup-beam.outputs.rebar3-version}}"
-        if: ${{matrix.pair.rebar3-version}}
+        if: ${{matrix.combo.rebar3-version}}
       - name: mix version and help (CLI)
         run: |
           mix -v
           mix help local.rebar
           mix help local.hex
-        if: ${{matrix.pair.elixir-version}}
+        if: ${{matrix.combo.elixir-version}}
       - name: Run Mix project tests
         run: |
           cd test-projects/mix
           mix deps.get
           mix test
-        if: ${{matrix.pair.elixir-version}}
+        if: ${{matrix.combo.elixir-version}}
       - name: Run rebar3 project tests
         run: |
           cd test-projects/rebar3
-          rebar3 as test do xref,dialyzer,ct,cover
-        if: ${{matrix.pair.rebar3-version}}
+          rebar3 ct
+        if: ${{matrix.combo.rebar3-version}}
diff --git a/README.md b/README.md
index 100ba563..6903a80d 100644
--- a/README.md
+++ b/README.md
@@ -37,12 +37,12 @@ not match a pre-release.
 ### Compatibility between Ubuntu and Erlang/OTP
 
 This list presents the known working version combos between Ubuntu
-and Erlang/OTP. Non-listed combos are not guaranteed to work.
+and Erlang/OTP.
 
 | Ubuntu       | Erlang/OTP | Status
 |-             |-           |-
 | ubuntu-16.04 | 17 - 23    | ✅
-| ubuntu-18.04 | 20 - 23    | ✅
+| ubuntu-18.04 | 17 - 23    | ✅
 | ubuntu-20.04 | 20 - 23    | ✅
 
 ### Basic example (Elixir)
diff --git a/test-projects/mix/test/test_test.exs b/test-projects/mix/test/test_test.exs
index 1ac58e8c..9acacdcd 100644
--- a/test-projects/mix/test/test_test.exs
+++ b/test-projects/mix/test/test_test.exs
@@ -6,4 +6,8 @@ defmodule TestTest do
     out = Logfmt.encode(foo: "bar")
     assert out == "foo=bar"
   end
+
+  test "ensures ssl" do
+    assert {:ok, _} = Application.ensure_all_started(:ssl)
+  end
 end
diff --git a/test-projects/rebar3/test/mylib_SUITE.erl b/test-projects/rebar3/test/mylib_SUITE.erl
index d783e497..37d8374b 100644
--- a/test-projects/rebar3/test/mylib_SUITE.erl
+++ b/test-projects/rebar3/test/mylib_SUITE.erl
@@ -5,7 +5,10 @@
 -compile([export_all, nowarn_export_all]).
 
 all() ->
-    [hello_world].
+    [hello_world, ssl_ok].
 
 hello_world(_Config) ->
     ?assertEqual(world, mylib:hello()).
+
+ssl_ok(_Config) ->
+    {ok, _} = application:ensure_all_started(ssl).