diff --git a/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj b/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj
index 3fdbf2b6d..a3227eac0 100644
--- a/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj
+++ b/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj
@@ -10,7 +10,7 @@
         <Company>Microsoft</Company>
         <Title>Microsoft.OpenApi.Readers</Title>
         <PackageId>Microsoft.OpenApi.Readers</PackageId>
-        <Version>1.4.0</Version>
+        <Version>1.4.1</Version>
         <Description>OpenAPI.NET Readers for JSON and YAML documents</Description>
         <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
         <PackageTags>OpenAPI .NET</PackageTags>
diff --git a/src/Microsoft.OpenApi.Readers/OpenApiYamlDocumentReader.cs b/src/Microsoft.OpenApi.Readers/OpenApiYamlDocumentReader.cs
index 3aedafbf1..37113578a 100644
--- a/src/Microsoft.OpenApi.Readers/OpenApiYamlDocumentReader.cs
+++ b/src/Microsoft.OpenApi.Readers/OpenApiYamlDocumentReader.cs
@@ -71,11 +71,11 @@ public OpenApiDocument Read(YamlDocument input, out OpenApiDiagnostic diagnostic
             if (_settings.RuleSet != null && _settings.RuleSet.Rules.Count > 0)
             {
                 var openApiErrors = document.Validate(_settings.RuleSet);
-                foreach (var item in openApiErrors.Where(e => e is OpenApiValidatorError))
+                foreach (var item in openApiErrors.OfType<OpenApiValidatorError>())
                 {
                     diagnostic.Errors.Add(item);
                 }
-                foreach (var item in openApiErrors.Where(e => e is OpenApiValidatorWarning))
+                foreach (var item in openApiErrors.OfType<OpenApiValidatorWarning>())
                 {
                     diagnostic.Warnings.Add(item);
                 }
@@ -114,11 +114,15 @@ public async Task<ReadResult> ReadAsync(YamlDocument input)
             // Validate the document
             if (_settings.RuleSet != null && _settings.RuleSet.Rules.Count > 0)
             {
-                var errors = document.Validate(_settings.RuleSet);
-                foreach (var item in errors)
+                var openApiErrors = document.Validate(_settings.RuleSet);
+                foreach (var item in openApiErrors.OfType<OpenApiValidatorError>())
                 {
                     diagnostic.Errors.Add(item);
                 }
+                foreach (var item in openApiErrors.OfType<OpenApiValidatorWarning>())
+                {
+                    diagnostic.Warnings.Add(item);
+                }
             }
 
             return new ReadResult()