diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,8 @@
+cmark 0.5.2.1 (22 May 2016)
+
+  * New .travis.yml - test with stack, cabal on many versions.
+  * Increase upper bound of base (Utku Demir).
+
 cmark 0.5.2 (26 Mar 2016)
 
   * Add flag to allow building with an installed libcmark (Jens Petersen).
diff --git a/cmark.cabal b/cmark.cabal
--- a/cmark.cabal
+++ b/cmark.cabal
@@ -1,5 +1,5 @@
 name:                cmark
-version:             0.5.2
+version:             0.5.2.1
 synopsis:            Fast, accurate CommonMark (Markdown) parser and renderer
 description:
   This package provides Haskell bindings for
@@ -54,7 +54,7 @@
 
 library
   exposed-modules:     CMark
-  build-depends:       base >=4.5 && < 4.9,
+  build-depends:       base >=4.5 && < 5.0,
                        text >= 1.0 && < 1.3,
                        bytestring
   if impl(ghc < 7.6)