diff --git a/shake.yaml b/shake.yaml
index b3698677f..e89f45704 100644
--- a/shake.yaml
+++ b/shake.yaml
@@ -1,5 +1,5 @@
 # Used to provide a different environment for the shake build script
-resolver: nightly-2018-12-15 # GHC 8.6.2
+resolver: lts-13.18 # GHC 8.6.4
 packages:
 - .