diff --git a/HISTORY.md b/HISTORY.md
index 03964db1e808d18bbe7edcf5d47ac104678512d3..9457c0d8eaf4db84835ebc45b30734bb90834bfc 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,7 +1,6 @@
 # Rocksdb Change Log
 
-## Unreleased
-
+## 4.0.0 (9/9/2015)
 ### New Features
 * Added support for transactions.  See include/rocksdb/utilities/transaction.h for more info.
 * DB::GetProperty() now accept "rocksdb.aggregated-table-properties" and "rocksdb.aggregated-table-properties-at-levelN", in which case it returns aggregated table properties of the target column family, or the aggregated table properties of the specified level N if the "at-level" version is used.
diff --git a/include/rocksdb/version.h b/include/rocksdb/version.h
index b00de56fce034bbe1342bb98356c11e0264781bc..e84e91974e084fcba4a5c0cd7c5bb55ffd0ee1c9 100644
--- a/include/rocksdb/version.h
+++ b/include/rocksdb/version.h
@@ -4,8 +4,8 @@
 // of patent rights can be found in the PATENTS file in the same directory.
 #pragma once
 
-#define ROCKSDB_MAJOR 3
-#define ROCKSDB_MINOR 14
+#define ROCKSDB_MAJOR 4
+#define ROCKSDB_MINOR 0
 #define ROCKSDB_PATCH 0
 
 // Do not use these. We made the mistake of declaring macros starting with