diff --git a/docs/HISTORY.md b/docs/HISTORY.md
index f47df6e..6e6e0b6 100644
--- a/docs/HISTORY.md
+++ b/docs/HISTORY.md
@@ -1,5 +1,12 @@
 # MongoDB Ruby Driver History
 
+### 1.5.2
+2011-12-13
+
+* Lots of fixes for replica set connection edge cases.
+* Set default op_timeout and connect_timeout to 30 seconds.
+* Support GeoHaystack indexing.
+
 ### 1.5.1
 2011-11-29
 
diff --git a/ext/cbson/version.h b/ext/cbson/version.h
index ad0ab1a..ad1aa43 100644
--- a/ext/cbson/version.h
+++ b/ext/cbson/version.h
@@ -14,4 +14,4 @@
  * limitations under the License.
  */
 
-#define VERSION "1.5.1"
+#define VERSION "1.5.2"
diff --git a/lib/bson.rb b/lib/bson.rb
index 41409d8..bd0dd4b 100644
--- a/lib/bson.rb
+++ b/lib/bson.rb
@@ -16,10 +16,10 @@
 # limitations under the License.
 # ++
 
-MINIMUM_BSON_EXT_VERSION = "1.5.1"
+MINIMUM_BSON_EXT_VERSION = "1.5.2"
 
 module BSON
-  VERSION = "1.5.1"
+  VERSION = "1.5.2"
 
   if defined? Mongo::DEFAULT_MAX_BSON_SIZE
     DEFAULT_MAX_BSON_SIZE = Mongo::DEFAULT_MAX_BSON_SIZE