diff --git a/wct.conf.json b/wct.conf.json
index 76bbae9..124ed69 100644
--- a/wct.conf.json
+++ b/wct.conf.json
@@ -10,27 +10,17 @@
 			"browsers": [
 				{
 					"browserName": "chrome",
-					"platform": "OS X 10.12",
-					"version": ""
-				},
-				{
-					"browserName": "chrome",
-					"platform": "Windows 10",
+					"platform": "OS X 10.13",
 					"version": ""
 				},
 				{
 					"browserName": "firefox",
-					"platform": "OS X 10.12",
-					"version": ""
-				},
-				{
-					"browserName": "firefox",
-					"platform": "Windows 10",
+					"platform": "OS X 10.13",
 					"version": ""
 				},
 				{
 					"browserName": "safari",
-					"platform": "OS X 10.12",
+					"platform": "OS X 10.13",
 					"version": ""
 				},
 				{