diff --git a/blank-canvas.cabal b/blank-canvas.cabal
--- a/blank-canvas.cabal
+++ b/blank-canvas.cabal
@@ -1,5 +1,5 @@
 Name:                blank-canvas
-Version:             0.2.2
+Version:             0.2.3
 Synopsis:            HTML5 Canvas Graphics Library
 Description:         A Haskell port of the HTML5 Canvas API.
                      blank-canvas works by providing a web service that
@@ -42,12 +42,12 @@
   default-language:    Haskell2010
   build-depends:       base             >= 4.3.1        && < 5,
                        aeson            == 0.6.*,
-                       containers       == 0.4.*,
-                       scotty           >= 0.4.5,
+                       containers       >  0.5,
+                       scotty           >= 0.4.6,
                        text             == 0.11.*,
                        transformers     >= 0.2.2,
-                       wai-extra        >= 1.2.0.6      && < 1.4,
-                       warp             >= 1.2.0.1      && < 1.4,
+                       wai-extra        == 1.3.*,
+                       warp             >= 1.3.1        && < 1.4,
                        stm              == 2.2.*
 
   GHC-options:  -Wall -fno-warn-orphans