Update CONTRIBUTING.md (#4730)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b18ab6f..a72ff2d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,7 +8,7 @@
* Linux or Mac OS X. (Windows is not yet supported.)
* git (used for source version control).
- * An IDE. We recommend [Atom](https://github.com/flutter/engine/wiki/Using-Atom-with-Flutter).
+ * An IDE. We recommend [Atom](http://dart-atom.github.io/dartlang/).
* An ssh client (used to authenticate with GitHub).
* Python (used by some of our tools).
* The Android platform tools (see [Issue #55](https://github.com/flutter/flutter/issues/55)