diff --git a/configure.ac b/configure.ac
index 846924727d03..11c2a3400f37 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,7 +13,7 @@ dnl
 # see what flags are available. (Better yet, read the documentation!)
 #
 
-AC_INIT([The Glorious Glasgow Haskell Compilation System], [8.6.3], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
+AC_INIT([The Glorious Glasgow Haskell Compilation System], [8.6.4], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
 
 # Set this to YES for a released version, otherwise NO
 : ${RELEASE=YES}