diff --git a/wai-middleware-prometheus.cabal b/wai-middleware-prometheus.cabal
--- a/wai-middleware-prometheus.cabal
+++ b/wai-middleware-prometheus.cabal
@@ -1,5 +1,5 @@
 name:                wai-middleware-prometheus
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:
     WAI middlware for exposing http://prometheus.io metrics.
 description:
@@ -24,7 +24,7 @@
   exposed-modules:
       Network.Wai.Middleware.Prometheus
   build-depends:
-      base               >=4.6 && <4.8
+      base               >=4.7 && <5
     , bytestring         >=0.9
     , data-default
     , http-types
@@ -41,6 +41,6 @@
   ghc-options:          -Wall
   main-is:              doctest.hs
   build-depends:
-      base
+      base               >=4.7 && <5
     , doctest
     , prometheus-client