diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+0.2.0.1
+-------
+* Fixed an overly conservative bound on `containers`.
+
 0.2
 ---
 * Converted to `Control.Lens` internally.
diff --git a/ersatz.cabal b/ersatz.cabal
--- a/ersatz.cabal
+++ b/ersatz.cabal
@@ -1,5 +1,5 @@
 name:           ersatz
-version:        0.2
+version:        0.2.0.1
 license:        BSD3
 license-file:   LICENSE
 author:         Edward A. Kmett, Johan Kiviniemi
@@ -115,7 +115,7 @@
     blaze-builder        == 0.3.*,
     blaze-textual        == 0.2.*,
     bytestring           >= 0.9     && < 0.12,
-    containers           >= 0.2.0.1 && < 0.5,
+    containers           >= 0.2.0.1 && < 0.6,
     data-default         >= 0.5     && < 0.6,
     ghc-prim,
     lens                 >= 3.8     && < 4.0,