diff --git a/index.js b/index.js
index 503e105..377a704 100644
--- a/index.js
+++ b/index.js
@@ -67,7 +67,7 @@ GHash.prototype.calculate = function(callback) {
         return hash.then(function(hash) {
             callback(null, hash);
         })
-        .error(callback);
+        .catch(callback);
     }
     
     return hash;
diff --git a/package.json b/package.json
index 6946083..327db7f 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,6 @@
   },
   "dependencies": {
     "bluebird": "^3.4.1",
-    "sharp": "^0.15.0"
+    "sharp": "^0.17.3"
   }
 }