diff --git a/src/Microsoft.AspNet.Hosting/project.json b/src/Microsoft.AspNet.Hosting/project.json
index 3bc77a7eb6..562e25d619 100644
--- a/src/Microsoft.AspNet.Hosting/project.json
+++ b/src/Microsoft.AspNet.Hosting/project.json
@@ -16,17 +16,17 @@
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
-                "System.Collections": "4.0.10.0",
-                "System.ComponentModel": "4.0.0.0",
-                "System.Console": "4.0.0.0",
-                "System.Diagnostics.Debug": "4.0.10.0",
-                "System.IO": "4.0.10.0",
-                "System.Linq": "4.0.0.0",
-                "System.Reflection": "4.0.10.0",
-                "System.Runtime": "4.0.20.0",
-                "System.Runtime.Extensions": "4.0.10.0",
-                "System.Threading": "4.0.0.0",
-                "System.Threading.Tasks": "4.0.10.0"
+                "System.Collections": "4.0.10-beta-*",
+                "System.ComponentModel": "4.0.0-beta-*",
+                "System.Console": "4.0.0-beta-*",
+                "System.Diagnostics.Debug": "4.0.10-beta-*",
+                "System.IO": "4.0.10-beta-*",
+                "System.Linq": "4.0.0-beta-*",
+                "System.Reflection": "4.0.10-beta-*",
+                "System.Runtime": "4.0.20-beta-*",
+                "System.Runtime.Extensions": "4.0.10-beta-*",
+                "System.Threading": "4.0.0-beta-*",
+                "System.Threading.Tasks": "4.0.10-beta-*"
             }
         }
     }
diff --git a/src/Microsoft.AspNet.RequestContainer/project.json b/src/Microsoft.AspNet.RequestContainer/project.json
index d381b0bb3d..2f81f60c6c 100644
--- a/src/Microsoft.AspNet.RequestContainer/project.json
+++ b/src/Microsoft.AspNet.RequestContainer/project.json
@@ -9,17 +9,17 @@
     "aspnet50": {},
     "aspnetcore50": {
       "dependencies": {
-        "System.Collections": "4.0.10.0",
-        "System.ComponentModel": "4.0.0.0",
-        "System.Diagnostics.Debug": "4.0.10.0",
-        "System.Linq": "4.0.0.0",
-        "System.Reflection": "4.0.10.0",
-        "System.Reflection.Extensions": "4.0.0.0",
-        "System.Reflection.TypeExtensions": "4.0.0.0",
-        "System.Runtime": "4.0.20.0",
-        "System.Runtime.Extensions": "4.0.10.0",
-        "System.Threading": "4.0.0.0",
-        "System.Threading.Tasks": "4.0.10.0"
+        "System.Collections": "4.0.10-beta-*",
+        "System.ComponentModel": "4.0.0-beta-*",
+        "System.Diagnostics.Debug": "4.0.10-beta-*",
+        "System.Linq": "4.0.0-beta-*",
+        "System.Reflection": "4.0.10-beta-*",
+        "System.Reflection.Extensions": "4.0.0-beta-*",
+        "System.Reflection.TypeExtensions": "4.0.0-beta-*",
+        "System.Runtime": "4.0.20-beta-*",
+        "System.Runtime.Extensions": "4.0.10-beta-*",
+        "System.Threading": "4.0.0-beta-*",
+        "System.Threading.Tasks": "4.0.10-beta-*"
       }
     }
   }
diff --git a/src/Microsoft.AspNet.TestHost/project.json b/src/Microsoft.AspNet.TestHost/project.json
index 0364f0bf2c..97cfef7de5 100644
--- a/src/Microsoft.AspNet.TestHost/project.json
+++ b/src/Microsoft.AspNet.TestHost/project.json
@@ -6,23 +6,23 @@
     "frameworks": {
         "aspnet50": {
             "frameworkAssemblies": {
-                "System.Net.Http": "4.0.0.0"
+                "System.Net.Http": "4.0.0-beta-*"
             }
         },
         "aspnetcore50": {
             "dependencies": {
-                "System.Collections": "4.0.10.0",
-                "System.ComponentModel": "4.0.0.0",
-                "System.Globalization": "4.0.10.0",
-                "System.Linq": "4.0.0.0",
-                "System.Reflection": "4.0.10.0",
-                "System.Runtime": "4.0.20.0",
-                "System.Runtime.Extensions": "4.0.10.0",
-                "System.Runtime.Serialization.Primitives": "4.0.0.0",
-                "System.Threading": "4.0.0.0",
-                "System.Threading.Tasks": "4.0.10.0",
-                "System.Threading.Thread": "4.0.0.0",
-                "System.Net.Http": "4.0.0.0"
+                "System.Collections": "4.0.10-beta-*",
+                "System.ComponentModel": "4.0.0-beta-*",
+                "System.Globalization": "4.0.10-beta-*",
+                "System.Linq": "4.0.0-beta-*",
+                "System.Reflection": "4.0.10-beta-*",
+                "System.Runtime": "4.0.20-beta-*",
+                "System.Runtime.Extensions": "4.0.10-beta-*",
+                "System.Runtime.Serialization.Primitives": "4.0.0-beta-*",
+                "System.Threading": "4.0.0-beta-*",
+                "System.Threading.Tasks": "4.0.10-beta-*",
+                "System.Threading.Thread": "4.0.0-beta-*",
+                "System.Net.Http": "4.0.0-beta-*"
             }
         }
     }