diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 94eeb9db..7b8d6b27 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,12 +5,12 @@ on: [push, pull_request]
 jobs:
   format:
     name: Format
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
 
       - name: Install OTP and Elixir
-        uses: erlef/setup-beam@v1.7
+        uses: erlef/setup-beam@v1
         with:
           otp-version: 24
           elixir-version: 1.12
@@ -23,7 +23,7 @@ jobs:
 
   test:
     name: Test
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     services:
       postgres:
@@ -40,10 +40,6 @@ jobs:
       fail-fast: false
       matrix:
         pair:
-          - erlang: master
-            elixir: 1.11.3
-          - erlang: 23.1
-            elixir: master
           - erlang: 23.1
             elixir: 1.11.3
           - erlang: 23.1
@@ -56,18 +52,6 @@ jobs:
             elixir: 1.7.2
           - erlang: 21.3
             elixir: 1.6.6
-          - erlang: 20.3
-            elixir: 1.5.3
-          - erlang: 20.2
-            elixir: 1.4.5
-          - erlang: 19.3
-            elixir: 1.3.4
-          - erlang: 19.3
-            elixir: 1.2.6
-          - erlang: 18.3
-            elixir: 1.1.1
-          - erlang: 17.5
-            elixir: 1.0.5
 
     env:
       HEXPM_OTP: OTP-23.1
@@ -82,18 +66,18 @@ jobs:
       - uses: actions/checkout@v1
 
       - name: Install OTP and Elixir
-        uses: erlef/setup-beam@v1.7
+        uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.pair.erlang}}
           elixir-version: ${{matrix.pair.elixir}}
 
       - name: Install OTP and Elixir for hexpm
         run: |
-          wget https://repo.hex.pm/builds/otp/ubuntu-16.04/${HEXPM_OTP}.tar.gz
+          wget https://builds.hex.pm/builds/otp/ubuntu-20.04/${HEXPM_OTP}.tar.gz
           mkdir -p ${HEXPM_OTP_PATH}
           tar -xf ${HEXPM_OTP}.tar.gz -C ${HEXPM_OTP_PATH} --strip-components=1
           ${HEXPM_OTP_PATH}/Install -minimal $(pwd)/${HEXPM_OTP_PATH}
-          wget https://repo.hex.pm/builds/elixir/${HEXPM_ELIXIR}.zip
+          wget https://builds.hex.pm/builds/elixir/${HEXPM_ELIXIR}.zip
           unzip -d ${HEXPM_ELIXIR_PATH} ${HEXPM_ELIXIR}.zip
           mkdir -p ${HEXPM_MIX_HOME}
           PATH=$(pwd)/${HEXPM_ELIXIR_PATH}/bin:$(pwd)/${HEXPM_OTP_PATH}/bin:${PATH} MIX_HOME=$(pwd)/${HEXPM_MIX_HOME} MIX_ARCHIVES=$(pwd)/${HEXPM_MIX_HOME} mix local.hex --force