diff --git a/stack.yaml b/stack.yaml
index b1f3b2c..d7152d4 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,7 +1,7 @@
 # For more information, see: http://docs.haskellstack.org/en/stable/yaml_configuration.html
 
 # Specifies the GHC version and set of packages available (e.g., lts-3.5, nightly-2015-09-21, ghc-7.10.2)
-resolver: lts-5.1
+resolver: lts-6.10
 
 # Local packages, usually specified by relative directory name
 packages: