diff --git a/Chart-diagrams.cabal b/Chart-diagrams.cabal
--- a/Chart-diagrams.cabal
+++ b/Chart-diagrams.cabal
@@ -1,5 +1,5 @@
 Name: Chart-diagrams
-Version: 1.9.4
+Version: 1.9.5
 License: BSD3
 License-file: LICENSE
 Copyright: Jan Bracker, 2006-2014
@@ -39,9 +39,9 @@
                , svg-builder >= 0.1 && < 0.2
                , bytestring >= 0.9 && < 1.0
                , operational >= 0.2.2 && < 0.3
-               , containers >= 0.4 && < 0.7
+               , containers >= 0.4 && < 0.8
                , data-default-class < 0.2
-               , lens >= 3.9 && < 5.2
+               , lens >= 3.9 && < 5.3
                , Chart >= 1.9 && < 1.10
                , text
   other-modules: Paths_Chart_diagrams
diff --git a/Graphics/Rendering/Chart/Backend/Diagrams.hs b/Graphics/Rendering/Chart/Backend/Diagrams.hs
--- a/Graphics/Rendering/Chart/Backend/Diagrams.hs
+++ b/Graphics/Rendering/Chart/Backend/Diagrams.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE GADTs #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE CPP #-}