1 files changed, 1 insertions, 1 deletions

diff --git a/stack.yaml b/stack.yaml
index 1079fe8..bd72f13 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-4.1
+resolver: lts-9.0
 packages:
 - lambdacube-ir.haskell
 extra-deps: []