diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 
 This package provides Haskell bindings for [libcmark], the reference
 parser for [CommonMark], a fully specified variant of Markdown.
-It includes sources for [libcmark] (version 0.27.0, implementing
+It includes sources for [libcmark] (version 0.27.1, implementing
 version 0.27 of the spec) and does not require prior installation of
 the C library.
 
diff --git a/cbits/cmark_version.h b/cbits/cmark_version.h
--- a/cbits/cmark_version.h
+++ b/cbits/cmark_version.h
@@ -1,7 +1,7 @@
 #ifndef CMARK_VERSION_H
 #define CMARK_VERSION_H
 
-#define CMARK_VERSION ((0 << 16) | (27 << 8)  | 0)
-#define CMARK_VERSION_STRING "0.27.0"
+#define CMARK_VERSION ((0 << 16) | (27 << 8)  | 1)
+#define CMARK_VERSION_STRING "0.27.1"
 
 #endif
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,12 @@
+cmark 0.5.5 (31 Jan 2017)
+
+  * Update to cmark 0.27.1.
+  * Update version bounds for dependencies.
+
+cmark 0.5.4 (18 Nov 2016)
+
+  * Update to cmark 0.27.0.
+
 cmark 0.5.3.1 (16 Jul 2016)
 
   * Remove unnecessary typedef that caused problems with the build
diff --git a/cmark.cabal b/cmark.cabal
--- a/cmark.cabal
+++ b/cmark.cabal
@@ -1,12 +1,12 @@
 name:                cmark
-version:             0.5.4
+version:             0.5.5
 synopsis:            Fast, accurate CommonMark (Markdown) parser and renderer
 description:
   This package provides Haskell bindings for
   <https://github.com/jgm/cmark libcmark>, the reference
   parser for <http://commonmark.org CommonMark>, a fully
   specified variant of Markdown. It includes sources for
-  libcmark (0.26.0) and does not require prior installation of the
+  libcmark (0.27.1) and does not require prior installation of the
   C library.
 
 homepage:            https://github.com/jgm/cmark-hs
@@ -96,7 +96,7 @@
                     cheapskate >= 0.1 && < 0.2,
                     markdown >= 0.1 && < 0.2,
                     discount >= 0.1 && < 0.2,
-                    blaze-html >= 0.7 && < 0.9
+                    blaze-html >= 0.7 && < 0.10
   ghc-options:      -O2
   default-language: Haskell2010