diff --git a/R/pkg/DESCRIPTION b/R/pkg/DESCRIPTION
index f237df1fb854db4049eafa867f02c259cbfba00d..7e9fd2df13dbe266f6a76a29a07ffa53b62f7214 100644
--- a/R/pkg/DESCRIPTION
+++ b/R/pkg/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: SparkR
 Type: Package
 Title: R frontend for Spark
-Version: 1.6.4
+Version: 1.6.3
 Date: 2013-09-09
 Author: The Apache Software Foundation
 Maintainer: Shivaram Venkataraman <shivaram@cs.berkeley.edu>
diff --git a/assembly/pom.xml b/assembly/pom.xml
index 13cf555a5f7fc55ce4347babf42cdf24f7854066..8e9747efd4b2d777b4861484fe461b1be0048565 100644
--- a/assembly/pom.xml
+++ b/assembly/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/bagel/pom.xml b/bagel/pom.xml
index e080625a82ab8e58ee342d3e1313c0f87665b48f..a73a18ad651c34dd40b334a7c9cc6649303e6291 100644
--- a/bagel/pom.xml
+++ b/bagel/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/core/pom.xml b/core/pom.xml
index f60bd000362277a623ad7b2d772227a6f92d848d..c232046fb56fced192e5f1e61569a266419abe67 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/docker-integration-tests/pom.xml b/docker-integration-tests/pom.xml
index 8d5eb4096d1e2537f1a0bb1bf22a3301b16d6f27..8514b48c638edd952bd11f7b178770505b890183 100644
--- a/docker-integration-tests/pom.xml
+++ b/docker-integration-tests/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/docs/_config.yml b/docs/_config.yml
index ee235bcfa3edbf18b2b6bcdfb2c37839ccd7d9ef..81dcb2c71fa1bc7a3b9d68208180b503e067794a 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -14,8 +14,8 @@ include:
 
 # These allow the documentation to be updated with newer releases
 # of Spark, Scala, and Mesos.
-SPARK_VERSION: 1.6.4-SNAPSHOT
-SPARK_VERSION_SHORT: 1.6.4
+SPARK_VERSION: 1.6.3
+SPARK_VERSION_SHORT: 1.6.3
 SCALA_BINARY_VERSION: "2.10"
 SCALA_VERSION: "2.10.5"
 MESOS_VERSION: 0.21.0
diff --git a/examples/pom.xml b/examples/pom.xml
index 4df369ba335c8dd26d660e65517e283cd0652680..87850fec0549754fb4276a764cb08b184150bdc3 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/external/flume-assembly/pom.xml b/external/flume-assembly/pom.xml
index 048009752b4d1bf80ad8578f56c183076a99b8d6..0173c0873201c100ab9843cddd8195ade5d88b45 100644
--- a/external/flume-assembly/pom.xml
+++ b/external/flume-assembly/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/flume-sink/pom.xml b/external/flume-sink/pom.xml
index 3046fad8c01cbd3c13e1eeaa573273c052ab6df9..c513404b2e1391a5f3383a2bb651c0a07f332856 100644
--- a/external/flume-sink/pom.xml
+++ b/external/flume-sink/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/flume/pom.xml b/external/flume/pom.xml
index ce0bc7303e02fdec358170686d6fee086ec49412..bbd62159991135e7277798eb405aad0084d59473 100644
--- a/external/flume/pom.xml
+++ b/external/flume/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/kafka-assembly/pom.xml b/external/kafka-assembly/pom.xml
index 536d198aa909e4555e50b74d31f4380faf4cbfab..bb86e2ce643534e83b920436a21d70b154265012 100644
--- a/external/kafka-assembly/pom.xml
+++ b/external/kafka-assembly/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/kafka/pom.xml b/external/kafka/pom.xml
index 8a0f69eda5c536a3e2ba9ff511309b233c921418..82ed3373548c8cdea4cf5dd740c395fdac137af8 100644
--- a/external/kafka/pom.xml
+++ b/external/kafka/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/mqtt-assembly/pom.xml b/external/mqtt-assembly/pom.xml
index 2ee76f79309734e7e82beea2eba0fd7869e9b98d..c528bc11c3b67103db49aa6c3c7493535e8f22f0 100644
--- a/external/mqtt-assembly/pom.xml
+++ b/external/mqtt-assembly/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/mqtt/pom.xml b/external/mqtt/pom.xml
index 4b549d3efe864b453369d9f00de0d99540d94f11..fa27970a61c6d3a80a5b4f1c8b9147d0d5b703d5 100644
--- a/external/mqtt/pom.xml
+++ b/external/mqtt/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/twitter/pom.xml b/external/twitter/pom.xml
index 851e4ca8439b9d978c395c210865b294d7f0d6b5..270d078e60b15aa6e6e9e558844c240aad9d1bca 100644
--- a/external/twitter/pom.xml
+++ b/external/twitter/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/external/zeromq/pom.xml b/external/zeromq/pom.xml
index 0d9868fb444e13e78bd3092d87d200a37575cda1..0160b058fbffbe0ab41a3c4911bc2f7e7f866073 100644
--- a/external/zeromq/pom.xml
+++ b/external/zeromq/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/java8-tests/pom.xml b/extras/java8-tests/pom.xml
index 65375b4c2c121f9a408ca6ea9150666fc848dfcf..aaf2973fb67ee0cc8cc429dc83e8fe2e02dc1fb7 100644
--- a/extras/java8-tests/pom.xml
+++ b/extras/java8-tests/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/kinesis-asl-assembly/pom.xml b/extras/kinesis-asl-assembly/pom.xml
index c4a829d26754454e0aef5047954dfb80dc4792cc..2de3837b79d0e9f22488367e15ac234848106e2b 100644
--- a/extras/kinesis-asl-assembly/pom.xml
+++ b/extras/kinesis-asl-assembly/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/kinesis-asl/pom.xml b/extras/kinesis-asl/pom.xml
index cd1d9101791f5b93cba959460780412b435bcb89..3a604fae56133a84f6c0a03a30e6acb285b57498 100644
--- a/extras/kinesis-asl/pom.xml
+++ b/extras/kinesis-asl/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/extras/spark-ganglia-lgpl/pom.xml b/extras/spark-ganglia-lgpl/pom.xml
index 9d8f0f367b547dedf59718df73907e3dc4434c83..40ea8816188ef1f79a50bb5d6ac8034474adcf0a 100644
--- a/extras/spark-ganglia-lgpl/pom.xml
+++ b/extras/spark-ganglia-lgpl/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/graphx/pom.xml b/graphx/pom.xml
index 59f33c16aa4fccf65e69f3d19466b53f11231f0c..7ad15a95ca598a4a3a2f949b8cde16642f672c09 100644
--- a/graphx/pom.xml
+++ b/graphx/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/launcher/pom.xml b/launcher/pom.xml
index 0a3d23d3c0b0362a7ade80e2ab0452727a23281a..d0aa350a6b752ff1b5dbac906b2e25f8521581b2 100644
--- a/launcher/pom.xml
+++ b/launcher/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/mllib/pom.xml b/mllib/pom.xml
index 0cbc26060f74b9f46b657c209c529a24f26d516c..d4c7a4013c3c2ee45d660048c5074a41e6c2f718 100644
--- a/mllib/pom.xml
+++ b/mllib/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/network/common/pom.xml b/network/common/pom.xml
index ad6ebfb3c5772faf5b1d4212612a9bd54f2214f6..7d1f76efdc039a69a90098a15cf0f2a51682884c 100644
--- a/network/common/pom.xml
+++ b/network/common/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/network/shuffle/pom.xml b/network/shuffle/pom.xml
index 0c1883611114fa99a4e3a33f3165bf6a6f04b039..6775324e0fdbbfd01d9f5d6b7f1a9a2106715670 100644
--- a/network/shuffle/pom.xml
+++ b/network/shuffle/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/network/yarn/pom.xml b/network/yarn/pom.xml
index 93d9c715702a45d4a3fbb44372c1c4f6d6081b9a..27f58047e6568f051eba396a0b92cd149eeec2cb 100644
--- a/network/yarn/pom.xml
+++ b/network/yarn/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/pom.xml b/pom.xml
index 092800d5908df61c9382326f3e68e0086148c126..dd27885ec198e21da111c3b2a9bf17191668a8bd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
   </parent>
   <groupId>org.apache.spark</groupId>
   <artifactId>spark-parent_2.10</artifactId>
-  <version>1.6.4-SNAPSHOT</version>
+  <version>1.6.3</version>
   <packaging>pom</packaging>
   <name>Spark Project Parent POM</name>
   <url>http://spark.apache.org/</url>
diff --git a/repl/pom.xml b/repl/pom.xml
index c6c5c130de6f8b9d614685b276b4c9f5d7dc88f8..f11e2f1b4d09f60108e6fc07b3f93751c83f0f75 100644
--- a/repl/pom.xml
+++ b/repl/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/catalyst/pom.xml b/sql/catalyst/pom.xml
index 5652230aed9d2d1d2dd2876c539287189a6bb6ab..95b2e1e0451787aeebea0601fcbf03caa7b74025 100644
--- a/sql/catalyst/pom.xml
+++ b/sql/catalyst/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/core/pom.xml b/sql/core/pom.xml
index 7772012ec0dc5464cc8e724f2a2d4d3b941f02af..09d4ec37312df16481ef2e08b22f10e535308cb3 100644
--- a/sql/core/pom.xml
+++ b/sql/core/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/hive-thriftserver/pom.xml b/sql/hive-thriftserver/pom.xml
index 4434cc930b48efcd2f452dbce234ba0e2dfd3ade..05806a1feb38ef75bf92ea989c472b16db29575c 100644
--- a/sql/hive-thriftserver/pom.xml
+++ b/sql/hive-thriftserver/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/sql/hive/pom.xml b/sql/hive/pom.xml
index 06c2069e9cab56b73132ae91584592aabd30ad96..b07f1fea1a05826823303aa9fd60bda4ab5fb639 100644
--- a/sql/hive/pom.xml
+++ b/sql/hive/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/streaming/pom.xml b/streaming/pom.xml
index 2cef01ea953fd3832b76d662deb5d3a4215f8470..8f0ecdff5568685b764525d0f56ce89dfe7a4659 100644
--- a/streaming/pom.xml
+++ b/streaming/pom.xml
@@ -21,7 +21,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/tags/pom.xml b/tags/pom.xml
index 6db0fd315af6e6cdc9c61582774024266f7c50cf..380f10124f7b28de6c63f3429e22ff2378d3ee30 100644
--- a/tags/pom.xml
+++ b/tags/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/tools/pom.xml b/tools/pom.xml
index 9f0f3afa25104d6a97d35cdec599a5ccee3a8fee..c22d6f7497979c402f77bc8ccf1b3940829c1ecf 100644
--- a/tools/pom.xml
+++ b/tools/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/unsafe/pom.xml b/unsafe/pom.xml
index 1b0980ce1d3933868d07b313cef3a99918df4c8f..11a617fe55f615b8811669f301c5375484e4b918 100644
--- a/unsafe/pom.xml
+++ b/unsafe/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>
 
diff --git a/yarn/pom.xml b/yarn/pom.xml
index 0ca8e6283804defb71b9939dfc15f914226b8e70..cb11684f8ea2c7e6e7bfdfb4679d55ef14e41de0 100644
--- a/yarn/pom.xml
+++ b/yarn/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache.spark</groupId>
     <artifactId>spark-parent_2.10</artifactId>
-    <version>1.6.4-SNAPSHOT</version>
+    <version>1.6.3</version>
     <relativePath>../pom.xml</relativePath>
   </parent>