diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,5 +1,8 @@
 -*-change-log-*-
 
+0.5.1.0 Ross Paterson <R.Paterson@city.ac.uk> Jan 2016
+	* Bump minor version number, required by added instances
+
 0.5.0.2 Ross Paterson <R.Paterson@city.ac.uk> Jan 2016
 	* Backported extra instances for Identity
 
diff --git a/transformers.cabal b/transformers.cabal
--- a/transformers.cabal
+++ b/transformers.cabal
@@ -1,5 +1,5 @@
 name:         transformers
-version:      0.5.0.2
+version:      0.5.1.0
 license:      BSD3
 license-file: LICENSE
 author:       Andy Gill, Ross Paterson