diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index c6dcf9a..843547f 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [ "master" ]
   pull_request:
-    branches: [ "main" ]
+    branches: [ "master" ]
 
 permissions:
   contents: read