diff --git a/stack.yaml b/stack.yaml
index 4fb928842..a1a49ac9d 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -6,7 +6,8 @@ nix:
 
 # stack seems to enable this by default now, basically disabling bounds checks. Force it off.
 #allow-newer: false
-resolver: nightly-2020-01-31
+#resolver: nightly-2020-01-31
+resolver: lts-15.2
 
 packages:
 - hledger-lib