diff --git a/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj b/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj
index 072fdcbf1..1ff5b99e9 100644
--- a/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj
+++ b/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj
@@ -10,7 +10,7 @@
         Microsoft
         
Microsoft.OpenApi.Readers
         Microsoft.OpenApi.Readers
-        1.3.2
+        1.4.0-preview1
         OpenAPI.NET Readers for JSON and YAML documents
         © Microsoft Corporation. All rights reserved.
         OpenAPI .NET
diff --git a/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj b/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj
index b30c7c1ca..a11622ec1 100644
--- a/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj
+++ b/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj
@@ -11,7 +11,7 @@
         Microsoft
         Microsoft.OpenApi
         Microsoft.OpenApi
-        1.3.2
+        1.4.0-preview1
         .NET models with JSON and YAML writers for OpenAPI specification
         © Microsoft Corporation. All rights reserved.
         OpenAPI .NET