diff --git a/glue-core.cabal b/glue-core.cabal
--- a/glue-core.cabal
+++ b/glue-core.cabal
@@ -1,5 +1,5 @@
 name:                   glue-core
-version:                0.6.2
+version:                0.6.3
 synopsis:               Make better services and clients.
 description:            Combinator library to enhance the general functionality of services and clients.
 license:                BSD3
@@ -25,7 +25,7 @@
                         Glue.Preload
                         Glue.Switching
   -- other-extensions:
-  build-depends:        base >=4.6 && <4.12,
+  build-depends:        base >=4.6 && <5,
                         glue-common,
                         transformers,
                         transformers-base,
@@ -40,7 +40,7 @@
   default-language:     Haskell2010
 
 test-suite glue-core-tests
-  build-depends:        base >=4.6 && <4.12,
+  build-depends:        base >=4.6 && <5,
                         glue-common ,
                         glue-core,
                         QuickCheck -any,