diff --git a/src/Microsoft.AspNetCore.Server.Testing/project.json b/src/Microsoft.AspNetCore.Server.Testing/project.json
index bf07662e9f..5f0795ce3a 100644
--- a/src/Microsoft.AspNetCore.Server.Testing/project.json
+++ b/src/Microsoft.AspNetCore.Server.Testing/project.json
@@ -32,7 +32,7 @@
         "System.Net.Http": "4.0.1-*",
         "System.Net.Primitives": "4.0.11-*",
         "System.Runtime.Extensions": "4.1.0-*",
-        "System.Text.RegularExpressions": "4.0.11-*",
+        "System.Text.RegularExpressions": "4.0.12-*",
         "System.Threading": "4.0.11-*",
         "System.Threading.Thread": "4.0.0-*"
       },