diff --git a/iridium.yaml b/iridium.yaml
index 7636457..77061b6 100644
--- a/iridium.yaml
+++ b/iridium.yaml
@@ -26,7 +26,7 @@ checks:
       - compiler: "ghc"
         version: "8.2.2"
       - compiler: "ghc"
-        version: "8.4.1"
+        version: "8.4.3"
     compilers-help: |
       for this to work, cabal will need the paths to the actual
       compilers to be configured; see the note about the user-global