diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+0.5
+-----------------------------------------------------------------------------
+- Update dependencies constraints.
+
 0.4
 -----------------------------------------------------------------------------
 - Use `singletons` library instead of `GHC.TypeLits` from base.
diff --git a/wai-predicates.cabal b/wai-predicates.cabal
--- a/wai-predicates.cabal
+++ b/wai-predicates.cabal
@@ -1,11 +1,13 @@
 name:                wai-predicates
-version:             0.4
+version:             0.5
 synopsis:            WAI request predicates
 license:             OtherLicense
 license-file:        LICENSE
 author:              Toralf Wittner
 maintainer:          Toralf Wittner <tw@dtex.org>
 copyright:           (c) 2014 Toralf Wittner
+homepage:            https://github.com/twittner/wai-predicates/
+bug-reports:         https://github.com/twittner/wai-predicates/issues
 stability:           experimental
 category:            Web
 build-type:          Simple
@@ -58,8 +60,8 @@
       , cookie           == 0.4.*
       , case-insensitive >= 1.1    && < 1.3
       , http-types       == 0.8.*
-      , singletons       == 0.10.*
-      , transformers     == 0.3.*
+      , singletons       >= 0.10   && < 1.1
+      , transformers     >= 0.3    && < 0.5
       , vault            == 0.3.*
       , vector           == 0.10.*
       , wai              >= 2.0    && < 2.2
