diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+0.3.1
+-----
+* Add a library dependency on the `doctests` test suite
+
 0.3
 ---
 * Replace use of `Hashable1` from `hashable-extras` in favor of `Hashable` from
diff --git a/approximate.cabal b/approximate.cabal
--- a/approximate.cabal
+++ b/approximate.cabal
@@ -1,6 +1,6 @@
 name:          approximate
 category:      Numeric
-version:       0.3
+version:       0.3.1
 license:       BSD3
 cabal-version: >= 1.8
 license-file:  LICENSE
@@ -93,6 +93,7 @@
     buildable: False
   else
     build-depends:
+      approximate,
       base,
       directory      >= 1.0,
       doctest        >= 0.9.1,