diff --git a/package.json b/package.json
index 9ff55af0..a5655ae3 100644
--- a/package.json
+++ b/package.json
@@ -38,13 +38,11 @@
     "babel-polyfill": "^6.23.0",
     "brace": "0.7.0",
     "btoa": "^1.1.2",
-    "debounce": "1.0.0",
     "deep-extend": "0.4.1",
     "expect": "1.20.2",
     "getbase": "^2.8.2",
     "immutable": "^3.x.x",
     "js-yaml": "^3.5.5",
-    "jsonschema": "^1.1.0",
     "less": "2.7.1",
     "lodash": "4.17.2",
     "matcher": "^0.1.2",
@@ -74,8 +72,7 @@
     "whatwg-fetch": "0.11.1",
     "worker-loader": "^0.7.1",
     "xml": "1.0.1",
-    "yaml-js": "^0.1.3",
-    "yaml-worker": "^2.1.0"
+    "yaml-js": "^0.1.3"
   },
   "devDependencies": {
     "autoprefixer": "6.6.1",
diff --git a/src/core/components/online-validator-badge.jsx b/src/core/components/online-validator-badge.jsx
index 25e57375..7988ea98 100644
--- a/src/core/components/online-validator-badge.jsx
+++ b/src/core/components/online-validator-badge.jsx
@@ -48,43 +48,48 @@ export default class OnlineValidatorBadge extends React.Component {
 
 
 class ValidatorImage extends React.Component {
+  static propTypes = {
+    src: PropTypes.string,
+    alt: PropTypes.string
+  }
+
   constructor(props) {
-    super(props);
+    super(props)
     this.state = {
       loaded: false,
       error: false
-    };
+    }
   }
 
   componentDidMount() {
-    const img = new Image();
+    const img = new Image()
     img.onload = () => {
       this.setState({
         loaded: true
-      });
+      })
     }
     img.onerror = () => {
       this.setState({
         error: true
-      });
+      })
     }
-    img.src = this.props.src;
+    img.src = this.props.src
   }
 
   componentWillReceiveProps(nextProps) {
     if (nextProps.src !== this.props.src) {
-      const img = new Image();
+      const img = new Image()
       img.onload = () => {
         this.setState({
           loaded: true
-        });
+        })
       }
       img.onerror = () => {
         this.setState({
           error: true
-        });
+        })
       }
-      img.src = nextProps.src;
+      img.src = nextProps.src
     }
   }