diff --git a/package.json b/package.json
index cb3cae49..eade3965 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "estraverse": "^5.0.0",
     "extend": "^3.0.0",
     "gm-papandreou": "^1.23.0-patch1",
-    "impro": "~0.11.0",
+    "impro": "~0.13.0",
     "jpegtran": "^2.0.0",
     "lodash": "^4.14.1",
     "memoizesync": "^1.1.1",