diff --git a/stack.yaml b/stack.yaml
index febfefe..0838921 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -18,7 +18,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-17.14
+resolver: lts-20.18
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.