diff --git a/Changes.txt b/Changes.txt
index 88f702a5..ad786e38 100644
--- a/Changes.txt
+++ b/Changes.txt
@@ -2,6 +2,15 @@
 @page changes Changes
 
 
+## 0.6.6 January 22 2017
+
+- Added functions to set chart Up-Down bars: see `chart_set_up_down_bars()`
+  and `chart_set_up_down_bars_format()` and @ref chart_data_tools.c.
+
+- Added functions to handle blank and hidden data in charts: see
+  `chart_show_blanks_as()` and `chart_show_hidden_data()`.
+
+
 ## 0.6.5 January 21 2017
 
 - Added functions to set the overlap and gap between series: see
diff --git a/include/xlsxwriter.h b/include/xlsxwriter.h
index b896b637..ac6a9210 100644
--- a/include/xlsxwriter.h
+++ b/include/xlsxwriter.h
@@ -18,6 +18,6 @@
 #include "xlsxwriter/format.h"
 #include "xlsxwriter/utility.h"
 
-#define LXW_VERSION "0.6.5"
+#define LXW_VERSION "0.6.6"
 
 #endif /* __LXW_XLSXWRITER_H__ */
diff --git a/libxlsxwriter.podspec b/libxlsxwriter.podspec
index c6fbaca1..2253be2b 100644
--- a/libxlsxwriter.podspec
+++ b/libxlsxwriter.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name                  = "libxlsxwriter"
-  s.version               = "0.6.5"
+  s.version               = "0.6.6"
   s.summary               = "Libxlsxwriter: A C library for creating Excel XLSX files."
   s.ios.deployment_target = "6.0"
   s.osx.deployment_target = "10.8"