diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5f7e284..c3de839c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.3.5] - 2023-10-05
+
+### Changed
+
+- Uses headers try add when setting the content type.
+
 ## [1.3.4] - 2023-10-04
 
 ### Changed
diff --git a/src/Microsoft.Kiota.Abstractions.csproj b/src/Microsoft.Kiota.Abstractions.csproj
index 0cd3dfca..31466815 100644
--- a/src/Microsoft.Kiota.Abstractions.csproj
+++ b/src/Microsoft.Kiota.Abstractions.csproj
@@ -14,7 +14,7 @@
     <PackageProjectUrl>https://aka.ms/kiota/docs</PackageProjectUrl>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <Deterministic>true</Deterministic>
-    <VersionPrefix>1.3.4</VersionPrefix>
+    <VersionPrefix>1.3.5</VersionPrefix>
     <VersionSuffix></VersionSuffix>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <SignAssembly>false</SignAssembly>
diff --git a/src/RequestInformation.cs b/src/RequestInformation.cs
index b9485a91..70b4ab18 100644
--- a/src/RequestInformation.cs
+++ b/src/RequestInformation.cs
@@ -195,7 +195,7 @@ public void SetStreamContent(Stream content)
             using var activity = _activitySource?.StartActivity(nameof(SetStreamContent));
             SetRequestType(content, activity);
             Content = content;
-            Headers.Add(ContentTypeHeader, BinaryContentType);
+            Headers.TryAdd(ContentTypeHeader, BinaryContentType);
         }
         private static ActivitySource _activitySource = new(typeof(RequestInformation).Namespace!);
         /// <summary>
@@ -211,7 +211,7 @@ public void SetContentFromParsable<T>(IRequestAdapter requestAdapter, string con
             using var writer = GetSerializationWriter(requestAdapter, contentType, items);
             SetRequestType(items.FirstOrDefault(static x => x != null), activity);
             writer.WriteCollectionOfObjectValues(null, items);
-            Headers.Add(ContentTypeHeader, contentType);
+            Headers.TryAdd(ContentTypeHeader, contentType);
             Content = writer.GetSerializedContent();
         }
         /// <summary>
@@ -232,7 +232,7 @@ public void SetContentFromParsable<T>(IRequestAdapter requestAdapter, string con
                 mpBody.RequestAdapter = requestAdapter;
             }
             writer.WriteObjectValue(null, item);
-            Headers.Add(ContentTypeHeader, contentType);
+            Headers.TryAdd(ContentTypeHeader, contentType);
             Content = writer.GetSerializedContent();
         }
         private static void SetRequestType(object? result, Activity? activity)
@@ -261,7 +261,7 @@ public void SetContentFromScalarCollection<T>(IRequestAdapter requestAdapter, st
             using var writer = GetSerializationWriter(requestAdapter, contentType, items);
             SetRequestType(items.FirstOrDefault(static x => x != null), activity);
             writer.WriteCollectionOfPrimitiveValues(null, items);
-            Headers.Add(ContentTypeHeader, contentType);
+            Headers.TryAdd(ContentTypeHeader, contentType);
             Content = writer.GetSerializedContent();
         }
         /// <summary>
@@ -323,7 +323,7 @@ public void SetContentFromScalar<T>(IRequestAdapter requestAdapter, string conte
                 default:
                     throw new InvalidOperationException($"error serialization data value with unknown type {item?.GetType()}");
             }
-            Headers.Add(ContentTypeHeader, contentType);
+            Headers.TryAdd(ContentTypeHeader, contentType);
             Content = writer.GetSerializedContent();
         }
     }