diff --git a/.github/workflows/build-all-versions.yml b/.github/workflows/build-all-versions.yml
index 4454930659..ecbcfff99e 100644
--- a/.github/workflows/build-all-versions.yml
+++ b/.github/workflows/build-all-versions.yml
@@ -66,7 +66,7 @@ jobs:
     strategy:
       matrix:
         stack: ["latest"]
-        ghc: ["7.10.3","8.0.2", "8.2.2", "8.4.4", "8.6.5", "8.8.4", "8.10.7"]
+        ghc: ["7.10.3","8.0.2", "8.2.2", "8.4.4", "8.6.5", "8.8.4", "8.10.7", "9.0.2"]
         # ghc: ["8.8.3"]
 
     steps:
diff --git a/stack-ghc9.0.2.yaml b/stack-ghc9.0.2.yaml
index 17eb5c855b..bdfeca7421 100644
--- a/stack-ghc9.0.2.yaml
+++ b/stack-ghc9.0.2.yaml
@@ -1,4 +1,4 @@
-resolver: nightly-2022-02-19
+resolver: nightly-2022-02-19 # ghc 9.0.2
 
 extra-deps:
 # - network-2.6.3.6