diff --git a/package.json b/package.json
index f0e58f8..ad94f1e 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "test": "make test"
   },
   "dependencies": {
-    "nan": "~1.2.0"
+    "nan": "~1.5.1"
   },
   "devDependencies": {
     "express": "3.0",
diff --git a/src/Canvas.cc b/src/Canvas.cc
index 01d3363..93f0329 100644
--- a/src/Canvas.cc
+++ b/src/Canvas.cc
@@ -353,7 +353,7 @@ streamPNG(void *c, const uint8_t *data, unsigned len) {
   Local<Value> argv[3] = {
       NanNew(NanNull())
     , buf
-    , NanNew<Integer>(len) };
+    , NanNew<Number>(len) };
   NanMakeCallback(NanGetCurrentContext()->Global(), closure->fn, 3, argv);
   return CAIRO_STATUS_SUCCESS;
 }
diff --git a/src/JPEGStream.h b/src/JPEGStream.h
index 5b1694b..95962e3 100644
--- a/src/JPEGStream.h
+++ b/src/JPEGStream.h
@@ -54,7 +54,7 @@ term_closure_destination(j_compress_ptr cinfo){
   Local<Value> data_argv[3] = {
       NanNew(NanNull())
     , NanNew(buf)
-    , NanNew<Integer>(remaining)
+    , NanNew<Number>(remaining)
   };
 
   NanMakeCallback(NanGetCurrentContext()->Global(), dest->closure->fn, 3, data_argv);