diff --git a/stack.yaml b/stack.yaml
index 16b093cf2..04a55c949 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -4,7 +4,7 @@ nix:
   pure: false
   packages: [perl gmp ncurses zlib]
 
-resolver: lts-17.4
+resolver: lts-18.0
 
 packages:
 - hledger-lib
@@ -33,4 +33,4 @@ packages:
 #  "$targets": -Werror
 #  "$everything": -O2
 #  some-package: -DSOME_CPP_FLAG
-  
\ No newline at end of file
+