diff --git a/.gitmodules b/.gitmodules
index 726a54405..47d156244 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "vendor/requirejs"]
 	path = vendor/requirejs
 	url = git://github.com/jrburke/requirejs.git
+[submodule "vendor/uglifyjs"]
+	path = vendor/uglifyjs
+	url = git://github.com/mishoo/UglifyJS.git
diff --git a/vendor/benchmark.js b/vendor/benchmark.js
index 73c7f6bbe..c88791308 160000
--- a/vendor/benchmark.js
+++ b/vendor/benchmark.js
@@ -1 +1 @@
-Subproject commit 73c7f6bbe569bf3c8ac8030a252e659bc7697b70
+Subproject commit c88791308bf1db4f4f0e2e9ec87ffb1026a9782e
diff --git a/vendor/uglifyjs b/vendor/uglifyjs
new file mode 160000
index 000000000..521bb0f1e
--- /dev/null
+++ b/vendor/uglifyjs
@@ -0,0 +1 @@
+Subproject commit 521bb0f1ec10bd1b52fe993f3a264746d6202c4f