diff --git a/stack.yaml b/stack.yaml
index ce1968904..62e15607a 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -8,8 +8,7 @@ packages:
 - parser-typechecker
 
 #compiler-check: match-exact
-resolver: lts-11.9
-compiler: ghc-8.4.2
+resolver: nightly-2018-06-25
 
 extra-deps:
 #  - applicative-extras-0.1.8