diff --git a/gem/Manifest.txt b/gem/Manifest.txt
index ff43bf3e3f8..28ca36a6b15 100644
--- a/gem/Manifest.txt
+++ b/gem/Manifest.txt
@@ -3,5 +3,5 @@ Manifest.txt
 README.txt
 lib/jruby-jars.rb
 lib/jruby-jars/version.rb
-lib/jruby-core-1.6.3.jar
-lib/jruby-stdlib-1.6.3.jar
+lib/jruby-core-1.7.0.dev.jar
+lib/jruby-stdlib-1.7.0.dev.jar