diff --git a/package.json b/package.json
index 65265dc..fb40c33 100644
--- a/package.json
+++ b/package.json
@@ -35,16 +35,16 @@
   "author": "Flickr Open Source <flickr-open-source@yahoo-inc.com>",
   "license": "ISC",
   "devDependencies": {
-    "browserify": "~11.1.0",
-    "coveralls": "^2.11.9",
-    "eslint": "^2.13.1",
-    "eslint-config-flickr": "~1.1.8",
-    "expect": "1.14.0",
+    "browserify": "^16.2.3",
+    "coveralls": "^3.0.2",
+    "eslint": "^5.10.0",
+    "eslint-config-flickr": "^1.3.1",
+    "expect": "^23.6.0",
     "istanbul": "^0.4.2",
-    "mocha": "2.4.5",
-    "uglify-js": "2.6.2"
+    "mocha": "^5.2.0",
+    "uglify-js": "^3.4.9"
   },
   "dependencies": {
-    "merge": "1.2.0"
+    "merge": "^1.2.1"
   }
 }
diff --git a/test/test.js b/test/test.js
index 11e8b33..b987549 100644
--- a/test/test.js
+++ b/test/test.js
@@ -128,7 +128,7 @@ describe('justified-layout', function () {
 					{ width: 10 }
 				]);
 			} catch (e) {
-				expect(e.message, "Item 0 has an invalid aspect ratio");
+				expect(e.message).toBe("Item 0 has an invalid aspect ratio");
 			}
 
 		});
@@ -140,7 +140,7 @@ describe('justified-layout', function () {
 					{ height: 10 }
 				]);
 			} catch (e) {
-				expect(e.message, "Item 0 has an invalid aspect ratio");
+				expect(e.message).toBe("Item 0 has an invalid aspect ratio");
 			}
 
 		});
@@ -150,7 +150,7 @@ describe('justified-layout', function () {
 			try {
 				justifiedLayout(['NaN']);
 			} catch (e) {
-				expect(e.message, "Item 0 has an invalid aspect ratio");
+				expect(e.message).toBe("Item 0 has an invalid aspect ratio");
 			}
 
 		});