diff --git a/appveyor.yml b/appveyor.yml
index aaf0396..d8fd49b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -36,7 +36,7 @@ environment:
     # version.
     #STACKVER: "1.6.5"
     STACK_UPGRADE: "y"
-    RESOLVER: "lts-20.14"
+    RESOLVER: "lts-22.33"
     STACK_ROOT: "c:\\sr"
     STACK_YAML: "stack.yaml"
 
diff --git a/stack.yaml b/stack.yaml
index d76d662..6e62fe5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-20.14
+resolver: lts-22.33
 packages:
 - '.'
 #extra-deps: