diff --git a/support/build/extensions/no-debug-non-zts-20131226/apcu b/support/build/extensions/no-debug-non-zts-20131226/apcu
index 6bac5db4f..5f8582f51 100755
--- a/support/build/extensions/no-debug-non-zts-20131226/apcu
+++ b/support/build/extensions/no-debug-non-zts-20131226/apcu
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/php/
-# Build Deps: php-5.6.0RC2
+# Build Deps: php-5.6.0RC4
 
 source $(dirname $0)/../no-debug-non-zts-20121212/$(basename $0)
diff --git a/support/build/extensions/no-debug-non-zts-20131226/imagick-bare b/support/build/extensions/no-debug-non-zts-20131226/imagick-bare
index 7d7ef5623..411b67e93 100755
--- a/support/build/extensions/no-debug-non-zts-20131226/imagick-bare
+++ b/support/build/extensions/no-debug-non-zts-20131226/imagick-bare
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/php/
-# Build Deps: php-5.6.0RC2, libraries/imagemagick
+# Build Deps: php-5.6.0RC4, libraries/imagemagick
 
 source $(dirname $0)/../no-debug-non-zts-20121212/$(basename $0)
diff --git a/support/build/extensions/no-debug-non-zts-20131226/memcached-bare b/support/build/extensions/no-debug-non-zts-20131226/memcached-bare
index b4a5a1838..48fae67f8 100755
--- a/support/build/extensions/no-debug-non-zts-20131226/memcached-bare
+++ b/support/build/extensions/no-debug-non-zts-20131226/memcached-bare
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/php/
-# Build Deps: php-5.6.0RC2, libraries/libmemcached
+# Build Deps: php-5.6.0RC4, libraries/libmemcached
 
 source $(dirname $0)/../no-debug-non-zts-20121212/$(basename $0)
diff --git a/support/build/extensions/no-debug-non-zts-20131226/mongo b/support/build/extensions/no-debug-non-zts-20131226/mongo
index 6bac5db4f..5f8582f51 100755
--- a/support/build/extensions/no-debug-non-zts-20131226/mongo
+++ b/support/build/extensions/no-debug-non-zts-20131226/mongo
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/php/
-# Build Deps: php-5.6.0RC2
+# Build Deps: php-5.6.0RC4
 
 source $(dirname $0)/../no-debug-non-zts-20121212/$(basename $0)
diff --git a/support/build/extensions/no-debug-non-zts-20131226/redis b/support/build/extensions/no-debug-non-zts-20131226/redis
index 6bac5db4f..5f8582f51 100755
--- a/support/build/extensions/no-debug-non-zts-20131226/redis
+++ b/support/build/extensions/no-debug-non-zts-20131226/redis
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/php/
-# Build Deps: php-5.6.0RC2
+# Build Deps: php-5.6.0RC4
 
 source $(dirname $0)/../no-debug-non-zts-20121212/$(basename $0)
diff --git a/support/build/php-5.6.0RC2 b/support/build/php-5.6.0RC4
similarity index 90%
rename from support/build/php-5.6.0RC2
rename to support/build/php-5.6.0RC4
index 11cffc35f..f87e7a73d 100755
--- a/support/build/php-5.6.0RC2
+++ b/support/build/php-5.6.0RC4
@@ -2,6 +2,6 @@
 # Build Path: /app/.heroku/php/
 # Build Deps: libraries/zlib, libraries/libmcrypt, libraries/icu, libraries/gettext
 
-VERSION=5.6.0RC2
+VERSION=5.6.0RC4
 
 source $(dirname $0)/php