diff --git a/Documentation/gen_licenses.py b/Documentation/gen_licenses.py
index 47a132c1a2..f0f45dd43f 100755
--- a/Documentation/gen_licenses.py
+++ b/Documentation/gen_licenses.py
@@ -56,16 +56,18 @@ def parse_graph():
       if target in KNOWN_PROVIDED_DEPS:
         continue
 
-      if args.partial:
-        if dep == '//lib/codemirror:js_minifier':
-          if target == '//lib/codemirror:js':
-            continue
-          if target.startswith('//lib/codemirror:mode_'):
-            continue
-        if (target == '//gerrit-gwtui:ui_module'
-            and dep == '//gerrit-gwtexpui:CSS'):
+      # js_minifier is only used by the build process.
+      # Skip it, even if --partial is not passed.
+      if dep == '//lib/codemirror:js_minifier':
+        if (target == '//lib/codemirror:js'
+            or target.startswith('//lib/codemirror:mode_')):
           continue
 
+      if (args.partial
+          and dep == '//gerrit-gwtexpui:CSS'
+          and target == '//gerrit-gwtui:ui_module'):
+        continue
+
       graph[target].append(dep)
   r = p.wait()
   if r != 0:
diff --git a/lib/codemirror/BUCK b/lib/codemirror/BUCK
index 6187b3b35a..d55428ceb7 100644
--- a/lib/codemirror/BUCK
+++ b/lib/codemirror/BUCK
@@ -16,7 +16,7 @@ else:
   ZIP = 'codemirror-%s.zip' % VERSION
 
 
-CLOSURE_VERSION = 'v20141120'
+CLOSURE_VERSION = 'v20151216'
 
 CLOSURE_COMPILER_ARGS = [
   '--compilation_level SIMPLE_OPTIMIZATIONS',
@@ -131,22 +131,17 @@ java_binary(
 maven_jar(
   name = 'compiler-jar',
   id = 'com.google.javascript:closure-compiler:' + CLOSURE_VERSION,
-  sha1 = '369618bf5a96f73e32655dc48919c0f97558d3b1',
-  license = 'Apache2.0',
-  deps = [
-    ':closure-compiler-externs',
-    '//lib:args4j',
-    '//lib:gson',
-    '//lib:guava',
-    '//lib:protobuf',
-  ],
+  sha1 = 'b5cd14a356cd9079791ba10b6d9623ef4ae4df6e',
+  license = 'DO_NOT_DISTRIBUTE',
+  deps = [':closure-compiler-externs'],
   visibility = [],
 )
 
 maven_jar(
   name = 'closure-compiler-externs',
   id = 'com.google.javascript:closure-compiler-externs:' + CLOSURE_VERSION,
-  sha1 = '247eff337e2737de43c8d963aaaef15bd8cda132',
+  sha1 = 'c2787d9927cb0825e8389e83fd3e1a798aae09cc',
   license = 'Apache2.0',
   visibility = [],
+  attach_source = False,
 )