diff --git a/prometheus.cabal b/prometheus.cabal
--- a/prometheus.cabal
+++ b/prometheus.cabal
@@ -1,5 +1,5 @@
 name:                prometheus
-version:             0.4.0
+version:             0.4.1
 synopsis:            Prometheus Haskell Client
 homepage:            http://github.com/LukeHoersten/prometheus#readme
 bug-reports:         http://github.com/LukeHoersten/prometheus/issues
@@ -77,7 +77,7 @@
                , base           >= 4.7  && < 4.10
                , bytestring     >= 0.10 && < 0.11
                , containers     >= 0.5  && < 0.6
-               , http-types     >= 0.9  && < 0.10
+               , http-types     >= 0.8  && < 0.10
                , text           >= 1.2  && < 1.3
                , transformers   >= 0.4  && < 0.6
                , wai            >= 3.2  && < 3.3