diff --git a/src/Microsoft.AspNetCore.Razor.Runtime/project.json b/src/Microsoft.AspNetCore.Razor.Runtime/project.json
index 73d9653645..ed9692ce41 100644
--- a/src/Microsoft.AspNetCore.Razor.Runtime/project.json
+++ b/src/Microsoft.AspNetCore.Razor.Runtime/project.json
@@ -58,7 +58,7 @@
         "System.Reflection": "4.1.0-*",
         "System.Reflection.Extensions": "4.0.1-*",
         "System.Reflection.TypeExtensions": "4.1.0-*",
-        "System.Text.RegularExpressions": "4.1.0-*",
+        "System.Text.RegularExpressions": "4.0.12-*",
         "System.Xml.XDocument": "4.0.11-*"
       }
     }
diff --git a/src/Microsoft.AspNetCore.Razor/project.json b/src/Microsoft.AspNetCore.Razor/project.json
index cf0a34f480..adb60baffc 100644
--- a/src/Microsoft.AspNetCore.Razor/project.json
+++ b/src/Microsoft.AspNetCore.Razor/project.json
@@ -35,7 +35,7 @@
         "System.Linq": "4.1.0-*",
         "System.Resources.ResourceManager": "4.0.1-*",
         "System.Runtime.Extensions": "4.1.0-*",
-        "System.Security.Cryptography.Algorithms": "4.2.0-*",
+        "System.Security.Cryptography.Algorithms": "4.1.0-*",
         "System.Threading": "4.0.11-*",
         "System.Threading.Thread": "4.0.0-*"
       }