diff --git a/stack.yaml b/stack.yaml
index 64e598fa0..b437bdc96 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -9,7 +9,7 @@ packages:
 
 #compiler-check: match-exact
 resolver: lts-11.9
-compiler: ghc-8.0.1
+compiler: ghc-8.4.3
 
 extra-deps:
 #  - applicative-extras-0.1.8