diff --git a/samples/SampleApp/project.json b/samples/SampleApp/project.json
index 53324e948f..25d10106db 100644
--- a/samples/SampleApp/project.json
+++ b/samples/SampleApp/project.json
@@ -9,7 +9,7 @@
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
-                "System.Console": "4.0.0.0"
+                "System.Console": "4.0.0-beta-*"
             }
         }
     },
diff --git a/src/Kestrel/project.json b/src/Kestrel/project.json
index 02b470341b..afc776aba1 100644
--- a/src/Kestrel/project.json
+++ b/src/Kestrel/project.json
@@ -10,7 +10,7 @@
         },
         "aspnetcore50": {
             "dependencies": {
-                "System.Runtime": "4.0.20.0"
+                "System.Runtime": "4.0.20-beta-*"
             }
         }
     }
diff --git a/src/Microsoft.AspNet.Server.Kestrel/project.json b/src/Microsoft.AspNet.Server.Kestrel/project.json
index a76c33de04..96359378c7 100644
--- a/src/Microsoft.AspNet.Server.Kestrel/project.json
+++ b/src/Microsoft.AspNet.Server.Kestrel/project.json
@@ -7,21 +7,21 @@
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
-                "System.Threading.ThreadPool": "4.0.10.0",
-                "System.Diagnostics.Debug": "4.0.10.0",
-                "System.Threading.Thread": "4.0.0.0",
-                "System.Diagnostics.TraceSource": "4.0.0.0",
-                "System.Text.Encoding": "4.0.10.0",
-                "System.Threading.Tasks": "4.0.10.0",
-                "System.Diagnostics.Tracing": "4.0.10.0",
-                "System.Collections": "4.0.10.0",
-                "System.IO": "4.0.10.0",
-                "System.Linq": "4.0.0.0",
-                "System.Net.Primitives": "4.0.10.0",
-                "System.Runtime.Extensions": "4.0.10.0",
-                "System.Threading": "4.0.0.0",
-                "System.Globalization": "4.0.10.0",
-                "System.Runtime.InteropServices": "4.0.20.0"
+                "System.Threading.ThreadPool": "4.0.10-beta-*",
+                "System.Diagnostics.Debug": "4.0.10-beta-*",
+                "System.Threading.Thread": "4.0.0-beta-*",
+                "System.Diagnostics.TraceSource": "4.0.0-beta-*",
+                "System.Text.Encoding": "4.0.10-beta-*",
+                "System.Threading.Tasks": "4.0.10-beta-*",
+                "System.Diagnostics.Tracing": "4.0.10-beta-*",
+                "System.Collections": "4.0.10-beta-*",
+                "System.IO": "4.0.10-beta-*",
+                "System.Linq": "4.0.0-beta-*",
+                "System.Net.Primitives": "4.0.10-beta-*",
+                "System.Runtime.Extensions": "4.0.10-beta-*",
+                "System.Threading": "4.0.0-beta-*",
+                "System.Globalization": "4.0.10-beta-*",
+                "System.Runtime.InteropServices": "4.0.20-beta-*"
             }
         }
     },
diff --git a/test/Microsoft.AspNet.Server.KestrelTests/project.json b/test/Microsoft.AspNet.Server.KestrelTests/project.json
index 8a4f25365e..52c53f7470 100644
--- a/test/Microsoft.AspNet.Server.KestrelTests/project.json
+++ b/test/Microsoft.AspNet.Server.KestrelTests/project.json
@@ -8,9 +8,9 @@
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
-                "System.Net.Sockets": "4.0.0.0",
-                "System.Runtime.Handles": "4.0.0.0",
-                "System.IO": "4.0.10.0"
+                "System.Net.Sockets": "4.0.0-beta-*",
+                "System.Runtime.Handles": "4.0.0-beta-*",
+                "System.IO": "4.0.10-beta-*"
             }
         }
     },