diff --git a/packages/core/package.json b/packages/core/package.json
index c5765a8..2005d3d 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -22,6 +22,6 @@
   "types": "lib/index.d.ts",
   "author": "Tony Garnock-Jones <tonyg@leastfixedpoint.com>",
   "dependencies": {
-    "preserves": "0.4.0"
+    "preserves": "0.5.1"
   }
 }