diff --git a/hailgun.cabal b/hailgun.cabal
--- a/hailgun.cabal
+++ b/hailgun.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             0.4.0.0
+version:             0.4.0.1
 
 -- A short (one-line) description of the package.
 synopsis:            Mailgun REST api interface for Haskell.
@@ -71,14 +71,14 @@
 
    build-depends:         base               >= 4.6 && < 5
                         , bytestring         >= 0.10.4 && <= 0.11
-                        , aeson              == 0.7.*
-                        , text               == 1.1.*
-                        , transformers       == 0.3.*
-                        , http-client        == 0.3.*
+                        , aeson              == 0.8.*
+                        , text               == 1.2.*
+                        , transformers       == 0.4.*
+                        , http-client        == 0.4.*
                         , http-client-tls    == 0.2.*
-                        , email-validate     == 2.0.*
+                        , email-validate     == 2.1.*
                         , http-types         == 0.8.*
-                        , exceptions         >= 0.4
+                        , exceptions         == 0.8.*
                         , tagsoup            == 0.13.*
                         , filepath           >= 1 && < 2