diff --git a/src/Microsoft.OpenApi.OData.Reader/OpenApiConvertSettings.cs b/src/Microsoft.OpenApi.OData.Reader/OpenApiConvertSettings.cs
index a7021c44..4ea0a38e 100644
--- a/src/Microsoft.OpenApi.OData.Reader/OpenApiConvertSettings.cs
+++ b/src/Microsoft.OpenApi.OData.Reader/OpenApiConvertSettings.cs
@@ -337,6 +337,15 @@ public string? PathPrefix
     /// </summary>
     public int ComposableFunctionsExpansionDepth { get; set; } = 1;
 
+    /// <summary>
+    /// Gets/sets a value indicating whether to use HTTP PUT method for update operations by default
+    /// instead of PATCH when no UpdateRestrictions annotation is present in the CSDL.
+    /// If false (default), PATCH will be used for updates.
+    /// If true, PUT will be used for updates.
+    /// This setting is ignored when UpdateRestrictions annotations are present in the CSDL.
+    /// </summary>
+    public bool UseHttpPutForUpdate { get; set; } = false;
+
     internal OpenApiConvertSettings Clone()
     {
         var newSettings = new OpenApiConvertSettings
@@ -392,7 +401,8 @@ internal OpenApiConvertSettings Clone()
             SemVerVersion = this.SemVerVersion,
             EnableAliasForOperationSegments = this.EnableAliasForOperationSegments,
             UseStringArrayForQueryOptionsSchema = this.UseStringArrayForQueryOptionsSchema,
-            ComposableFunctionsExpansionDepth = this.ComposableFunctionsExpansionDepth
+            ComposableFunctionsExpansionDepth = this.ComposableFunctionsExpansionDepth,
+            UseHttpPutForUpdate = this.UseHttpPutForUpdate
         };
 
         return newSettings;
diff --git a/src/Microsoft.OpenApi.OData.Reader/PathItem/ComplexPropertyItemHandler.cs b/src/Microsoft.OpenApi.OData.Reader/PathItem/ComplexPropertyItemHandler.cs
index 6596750e..1e4e7a83 100644
--- a/src/Microsoft.OpenApi.OData.Reader/PathItem/ComplexPropertyItemHandler.cs
+++ b/src/Microsoft.OpenApi.OData.Reader/PathItem/ComplexPropertyItemHandler.cs
@@ -99,7 +99,16 @@ public void AddUpdateOperation(OpenApiPathItem item)
             }
             else
             {
-                AddOperation(item, HttpMethod.Patch);
+                // When no explicit update method is specified in UpdateRestrictions,
+                // use the UseHttpPutForUpdate setting to determine the default method
+                if (Context?.Settings?.UseHttpPutForUpdate == true)
+                {
+                    AddOperation(item, HttpMethod.Put);
+                }
+                else
+                {
+                    AddOperation(item, HttpMethod.Patch);
+                }
             }
         }
     }
diff --git a/src/Microsoft.OpenApi.OData.Reader/PathItem/EntityPathItemHandler.cs b/src/Microsoft.OpenApi.OData.Reader/PathItem/EntityPathItemHandler.cs
index 0487f787..0d4dbdbd 100644
--- a/src/Microsoft.OpenApi.OData.Reader/PathItem/EntityPathItemHandler.cs
+++ b/src/Microsoft.OpenApi.OData.Reader/PathItem/EntityPathItemHandler.cs
@@ -67,7 +67,16 @@ protected override void SetOperations(OpenApiPathItem item)
                 }
                 else
                 {
-                    AddOperation(item, HttpMethod.Patch);
+                    // When no explicit update method is specified in UpdateRestrictions,
+                    // use the UseHttpPutForUpdate setting to determine the default method
+                    if (Context?.Settings?.UseHttpPutForUpdate == true)
+                    {
+                        AddOperation(item, HttpMethod.Put);
+                    }
+                    else
+                    {
+                        AddOperation(item, HttpMethod.Patch);
+                    }
                 }
             }
 
diff --git a/src/Microsoft.OpenApi.OData.Reader/PathItem/NavigationPropertyPathItemHandler.cs b/src/Microsoft.OpenApi.OData.Reader/PathItem/NavigationPropertyPathItemHandler.cs
index a1c33b15..a86fc5da 100644
--- a/src/Microsoft.OpenApi.OData.Reader/PathItem/NavigationPropertyPathItemHandler.cs
+++ b/src/Microsoft.OpenApi.OData.Reader/PathItem/NavigationPropertyPathItemHandler.cs
@@ -279,7 +279,16 @@ private void AddUpdateOperation(OpenApiPathItem item, UpdateRestrictionsType? up
                 }
                 else
                 {
-                    AddOperation(item, HttpMethod.Patch);
+                    // When no explicit update method is specified in UpdateRestrictions,
+                    // use the UseHttpPutForUpdate setting to determine the default method
+                    if (Context?.Settings?.UseHttpPutForUpdate == true)
+                    {
+                        AddOperation(item, HttpMethod.Put);
+                    }
+                    else
+                    {
+                        AddOperation(item, HttpMethod.Patch);
+                    }
                 }
             }
 
diff --git a/src/Microsoft.OpenApi.OData.Reader/PublicAPI.Unshipped.txt b/src/Microsoft.OpenApi.OData.Reader/PublicAPI.Unshipped.txt
index e29f3677..ee063ec9 100644
--- a/src/Microsoft.OpenApi.OData.Reader/PublicAPI.Unshipped.txt
+++ b/src/Microsoft.OpenApi.OData.Reader/PublicAPI.Unshipped.txt
@@ -221,6 +221,8 @@ Microsoft.OpenApi.OData.OpenApiConvertSettings.UseStringArrayForQueryOptionsSche
 Microsoft.OpenApi.OData.OpenApiConvertSettings.UseStringArrayForQueryOptionsSchema.set -> void
 Microsoft.OpenApi.OData.OpenApiConvertSettings.UseSuccessStatusCodeRange.get -> bool
 Microsoft.OpenApi.OData.OpenApiConvertSettings.UseSuccessStatusCodeRange.set -> void
+Microsoft.OpenApi.OData.OpenApiConvertSettings.UseHttpPutForUpdate.get -> bool
+Microsoft.OpenApi.OData.OpenApiConvertSettings.UseHttpPutForUpdate.set -> void
 Microsoft.OpenApi.OData.OpenApiConvertSettings.VerifyEdmModel.get -> bool
 Microsoft.OpenApi.OData.OpenApiConvertSettings.VerifyEdmModel.set -> void
 Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey
diff --git a/src/OoasUtil/ComLineProcessor.cs b/src/OoasUtil/ComLineProcessor.cs
index 84cb58c3..b8169d50 100644
--- a/src/OoasUtil/ComLineProcessor.cs
+++ b/src/OoasUtil/ComLineProcessor.cs
@@ -99,6 +99,11 @@ public ComLineProcessor(string[] args)
         /// </summary>
         public bool? RequireDerivedTypesConstraint { get; private set; }
 
+        /// <summary>
+        /// Use HTTP PUT method for update operations by default instead of PATCH.
+        /// </summary>
+        public bool? UseHttpPutForUpdate { get; private set; }
+
         /// <summary>
         /// Process the arguments.
         /// </summary>
@@ -227,6 +232,14 @@ public bool Process()
                             }
                             break;
 
+                        case "--useputforupdate":
+                        case "-put":
+                            if (!ProcessUseHttpPutForUpdate(true))
+                            {
+                                return false;
+                            }
+                            break;
+
                         default:
                             PrintUsage();
                             return false;
@@ -285,6 +298,11 @@ public bool Process()
                 DisableSchemaExamples = false;
             }
 
+            if (UseHttpPutForUpdate == null)
+            {
+                UseHttpPutForUpdate = false;
+            }
+
             _continue = ValidateArguments();
             return _continue;
         }
@@ -419,6 +437,19 @@ private bool ProcessDisableSchemaExamples(bool disableSchemaExamples)
             return true;
         }
 
+        private bool ProcessUseHttpPutForUpdate(bool useHttpPutForUpdate)
+        {
+            if (UseHttpPutForUpdate != null)
+            {
+                Console.WriteLine("[Error:] Multiple [--useputforupdate|-put] are not allowed.\n");
+                PrintUsage();
+                return false;
+            }
+
+            UseHttpPutForUpdate = useHttpPutForUpdate;
+            return true;
+        }
+
         private bool ProcessTarget(int version)
         {
             if (Version != null)
@@ -484,6 +515,7 @@ public static void PrintUsage()
             sb.Append("  --enablepagination|-p\t\t\tSet the output to expose pagination for collections.\n");
             sb.Append("  --enableunqualifiedcall|-u\t\t\tSet the output to use unqualified calls for bound operations.\n");
             sb.Append("  --disableschemaexamples|-x\t\t\tDisable examples in the schema.\n");
+            sb.Append("  --useputforupdate|-put\t\t\tUse HTTP PUT method for update operations instead of PATCH by default.\n");
             sb.Append("  --json|-j\t\t\tSet the output format as JSON.\n");
             sb.Append("  --yaml|-y\t\t\tSet the output format as YAML.\n");
             sb.Append("  --specversion|-s IntVersion\tSet the OpenApi Specification version of the output. Only 2 or 3 are supported.\n");
diff --git a/src/OoasUtil/Program.cs b/src/OoasUtil/Program.cs
index 211dc0f5..937abdde 100644
--- a/src/OoasUtil/Program.cs
+++ b/src/OoasUtil/Program.cs
@@ -42,6 +42,7 @@ static async System.Threading.Tasks.Task<int> Main(string[] args)
                 EnableUnqualifiedCall = processor.EnableUnqualifiedCall.Value,
                 ShowSchemaExamples = !processor.DisableSchemaExamples.Value,
                 OpenApiSpecVersion = processor.Version.Value,
+                UseHttpPutForUpdate = processor.UseHttpPutForUpdate.Value,
             };
 
             if (processor.IsLocalFile)
diff --git a/tool/versioning.props b/tool/versioning.props
index b6bd275b..5caaa033 100644
--- a/tool/versioning.props
+++ b/tool/versioning.props
@@ -29,7 +29,7 @@
     overflows the Int16. The system convert below will throw errors when this happens.
   -->
   <PropertyGroup>
-    <VersionStartYear Condition="'$(VersionStartYear)' == ''">2020</VersionStartYear>
+    <VersionStartYear Condition="'$(VersionStartYear)' == ''">2026</VersionStartYear>
 	
 	<!--  { Now.Year - 2019 + 1}{MM}{DD} -->
     <VersionDateCode>$([System.Convert]::ToInt32('$([MSBuild]::Add(1, $([MSBuild]::Subtract($([System.DateTime]::Now.Year), $(VersionStartYear)))))$([System.DateTime]::Now.ToString("MMdd"))'))</VersionDateCode>