diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a06c6fa..1a4400a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,9 +18,8 @@ jobs:
               #- windows-latest
         ocaml-compiler:
             - '4.08.x'
-            - '4.12.x'
             - '4.14.x'
-            - '5.1.x'
+            - '5.3.x'
 
     runs-on: ${{ matrix.os }}
     steps: