diff --git a/package.json b/package.json
index 061427f0..6a112def 100755
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "buffer"
   ],
   "dependencies": {
-    "nan": "^1.2.0",
+    "nan": "^1.3.0",
     "bluebird": "^2.2.2"
   },
   "devDependencies": {
diff --git a/src/sharp.cc b/src/sharp.cc
index 5d27950a..a47c27c9 100755
--- a/src/sharp.cc
+++ b/src/sharp.cc
@@ -425,6 +425,9 @@ class ResizeWorker : public NanAsyncWorker {
       (baton->err).append("Unsupported output " + baton->file_out);
     }
     g_object_unref(output);
+
+    // Clean up libvips' per-request data and threads
+    vips_error_clear();
     vips_thread_shutdown();
   }