diff --git a/.gitignore b/.gitignore
index 18e627d..205e69a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
-tools/
-
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 ##
@@ -289,6 +287,5 @@ __pycache__/
 *.odx.cs
 *.xsd.cs
 
-# Unity libraries
-lib/UnityEngine.dll
-lib/UnityEngine.CoreModule.dll
+# Cake binaries
+tools/
diff --git a/lib/UnityEngine.dll b/lib/UnityEngine.dll
new file mode 100644
index 0000000..b129406
Binary files /dev/null and b/lib/UnityEngine.dll differ