diff --git a/ubuntu.json b/ubuntu.json
index 1acb82c..155c9c7 100644
--- a/ubuntu.json
+++ b/ubuntu.json
@@ -214,6 +214,11 @@
     "sourceline": "deb http://apt.llvm.org/precise/ llvm-toolchain-precise-3.9 main",
     "key_url": "http://apt.llvm.org/llvm-snapshot.gpg.key"
   },
+  {
+    "alias": "llvm-toolchain-precise-4.0",
+    "sourceline": "deb http://apt.llvm.org/precise/ llvm-toolchain-precise-4.0 main",
+    "key_url": "http://apt.llvm.org/llvm-snapshot.gpg.key"
+  },
   {
     "alias": "llvm-toolchain-trusty",
     "sourceline": "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty main",