diff --git a/slack-web.cabal b/slack-web.cabal
--- a/slack-web.cabal
+++ b/slack-web.cabal
@@ -1,5 +1,5 @@
 name: slack-web
-version: 0.2.0.8
+version: 0.2.0.9
 
 build-type: Simple
 cabal-version: 1.21
@@ -45,14 +45,14 @@
       Web.Slack.Util
   build-depends:
       aeson >= 1.0 && < 1.5
-    , base >= 4.9 && < 4.13
+    , base >= 4.11 && < 4.13
     , containers
-    , http-api-data >= 0.3 && < 0.4
+    , http-api-data >= 0.3 && < 0.5
     , http-client >= 0.5 && < 0.6
     , http-client-tls >= 0.3 && < 0.4
-    , servant >= 0.12 && < 0.15
-    , servant-client >= 0.12 && < 0.15
-    , servant-client-core >= 0.12 && < 0.15
+    , servant >= 0.12 && < 0.16
+    , servant-client >= 0.12 && < 0.16
+    , servant-client-core >= 0.12 && < 0.16
     , text >= 1.2 && < 1.3
     , transformers
     , mtl
@@ -79,7 +79,7 @@
       Web.Slack.MessageParserSpec
       Web.Slack.Types
   build-depends:
-      base >= 4.9 && < 4.13
+      base >= 4.11 && < 4.13
     , containers
     , aeson
     , errors