diff --git a/stack.yaml b/stack.yaml
index f96cc90..e35a340 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-16.28
+resolver: lts-16.31
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 58f65cd..e16b210 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -13,7 +13,7 @@ packages:
     hackage: implicit-hie-0.1.2.5
 snapshots:
 - completed:
-    size: 533053
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/28.yaml
-    sha256: a9c01d860ac8dfb3a1b6f7ec4a36dd9504a95392b89c99b0877da63fa36a8e97
-  original: lts-16.28
+    size: 534126
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/31.yaml
+    sha256: 637fb77049b25560622a224845b7acfe81a09fdb6a96a3c75997a10b651667f6
+  original: lts-16.31