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: 0.2.0.5
+version: 0.2.0.6
 
 build-type: Simple
 cabal-version: >= 1.21
@@ -50,9 +50,9 @@
     , http-api-data >= 0.3 && < 0.4
     , http-client >= 0.5 && < 0.6
     , http-client-tls >= 0.3 && < 0.4
-    , servant >= 0.12 && < 0.14
-    , servant-client >= 0.12 && < 0.14
-    , servant-client-core >= 0.12 && < 0.14
+    , servant >= 0.12 && < 0.15
+    , servant-client >= 0.12 && < 0.15
+    , servant-client-core >= 0.12 && < 0.15
     , text >= 1.2 && < 1.3
     , transformers
     , mtl