diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+4.0.7
+-----
+* Removed dependency on `constraints`. It was used in a pre-release version of 4.0 but never made it into 4.0, but the dependency had remained around complicating builds for GHC 7.4.
+
 4.0.6
 -----
 * `makeLenses` attempt to make the accessors it can under existential quantification.
diff --git a/lens.cabal b/lens.cabal
--- a/lens.cabal
+++ b/lens.cabal
@@ -1,6 +1,6 @@
 name:          lens
 category:      Data, Lenses, Generics
-version:       4.0.6
+version:       4.0.7
 license:       BSD3
 cabal-version: >= 1.8
 license-file:  LICENSE
@@ -188,7 +188,6 @@
     bifunctors                >= 4        && < 5,
     bytestring                >= 0.9.1.10 && < 0.11,
     comonad                   >= 4        && < 5,
-    constraints               >= 0.3.3    && < 1,
     contravariant             >= 0.3      && < 1,
     containers                >= 0.4.0    && < 0.6,
     distributive              >= 0.3      && < 1,