diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ef8453..004d1d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,11 @@ jobs:
       matrix:
         os: [ ubuntu-latest, macOS-latest ]
         ghc: [ 8.0.2, 8.2.2, 8.4.4, 8.6.5, 8.8.3, 8.10.2, 9.0.1 ]
+        include:
+          - os: ubuntu-20.04
+            ghc: 8.0.2
+          - os: ubuntu-20.04
+            ghc: 8.2.2
         exclude:
           - os: macOS-latest
             ghc: 8.0.2