diff --git a/lens.cabal b/lens.cabal
--- a/lens.cabal
+++ b/lens.cabal
@@ -1,6 +1,6 @@
 name:          lens
 category:      Data, Lenses
-version:       3.6
+version:       3.6.0.1
 license:       BSD3
 cabal-version: >= 1.8
 license-file:  LICENSE
@@ -288,9 +288,11 @@
   main-is: doctests.hs
   build-depends:
     base,
+    containers,
     directory >= 1.0 && < 1.3,
     doctest >= 0.9.1 && <= 0.10,
-    filepath
+    filepath,
+    unordered-containers
   ghc-options: -Wall -threaded
   if impl(ghc<7.6.1)
     ghc-options: -Werror