diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0277c62..a538ea2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,17 +16,17 @@ jobs:
       matrix:
         include:
           - elixir: 1.4.x
-            otp: 18
-            os: ubuntu-18.04
+            otp: 20
+            os: ubuntu-20.04
           - elixir: 1.5.x
-            otp: 18
-            os: ubuntu-18.04
+            otp: 20
+            os: ubuntu-20.04
           - elixir: 1.6.x
-            otp: 19
-            os: ubuntu-18.04
+            otp: 20
+            os: ubuntu-20.04
           - elixir: 1.7.x
-            otp: 19
-            os: ubuntu-18.04
+            otp: 20
+            os: ubuntu-20.04
           - elixir: 1.8.x
             otp: 20
             os: ubuntu-20.04