diff --git a/src/Microsoft.AspNet.Server.WebListener/project.json b/src/Microsoft.AspNet.Server.WebListener/project.json
index 20b22d72eb..59de096b54 100644
--- a/src/Microsoft.AspNet.Server.WebListener/project.json
+++ b/src/Microsoft.AspNet.Server.WebListener/project.json
@@ -16,7 +16,7 @@
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
-                "Microsoft.Win32.Primitives": "4.0.0.0",
+                "Microsoft.Win32.Primitives": "4.0.0-beta-*",
                 "System.Collections": "4.0.10-beta-*",
                 "System.Collections.Concurrent": "4.0.0-beta-*",
                 "System.Diagnostics.Contracts": "4.0.0-beta-*",
diff --git a/src/Microsoft.Net.Http.Server/project.json b/src/Microsoft.Net.Http.Server/project.json
index acdb4219bb..6be4acb186 100644
--- a/src/Microsoft.Net.Http.Server/project.json
+++ b/src/Microsoft.Net.Http.Server/project.json
@@ -13,7 +13,7 @@
         "aspnetcore50": {
             "dependencies": {
                 "Microsoft.Net.WebSocketAbstractions": "1.0.0-*",
-                "Microsoft.Win32.Primitives": "4.0.0.0",
+                "Microsoft.Win32.Primitives": "4.0.0-beta-*",
                 "System.Collections": "4.0.10-beta-*",
                 "System.Collections.Concurrent": "4.0.0-beta-*",
                 "System.Diagnostics.Contracts": "4.0.0-beta-*",
diff --git a/src/Microsoft.Net.WebSockets/project.json b/src/Microsoft.Net.WebSockets/project.json
index b4cfc74b59..6280518ea0 100644
--- a/src/Microsoft.Net.WebSockets/project.json
+++ b/src/Microsoft.Net.WebSockets/project.json
@@ -8,7 +8,7 @@
         "net45": { },
         "aspnetcore50": {
             "dependencies": {
-                "Microsoft.Win32.Primitives": "4.0.0.0",
+                "Microsoft.Win32.Primitives": "4.0.0-beta-*",
                 "System.Collections": "4.0.10-beta-*",
                 "System.Collections.Concurrent": "4.0.0-beta-*",
                 "System.Diagnostics.Contracts": "4.0.0-beta-*",