diff --git a/stack.yaml b/stack.yaml
index f82da9d..013a54b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-16.17
+resolver: lts-18.12
 
 packages:
 - .
diff --git a/stack.yaml.lock b/stack.yaml.lock
index ff5b410..7adbaad 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 532386
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/17.yaml
-    sha256: d3ee1ae797cf63189c95cf27f00700304946c5cb3c1e6a82001cd6584a221e1b
-  original: lts-16.17
+    size: 586041
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/12.yaml
+    sha256: 80fc6391195ff00c36f2a605ecbb07de909bfaa2eaa9722a27e486a6ecf8ecb0
+  original: lts-18.12