diff --git a/src/Methods.cs b/src/Methods.cs
index 9e94edf..b139b19 100644
--- a/src/Methods.cs
+++ b/src/Methods.cs
@@ -77,6 +77,11 @@ public enum EnumHandlingMode
         /// <summary>
         /// Convert to lowercase string form
         /// </summary>
-        StringLower
+        StringLower,
+
+        /// <summary>
+        /// Convert to uppercase string form
+        /// </summary>
+        StringUpper
     }
 }
diff --git a/src/Utils/ParameterUtils.cs b/src/Utils/ParameterUtils.cs
index d4f8ce8..d6123f8 100644
--- a/src/Utils/ParameterUtils.cs
+++ b/src/Utils/ParameterUtils.cs
@@ -67,6 +67,7 @@ internal static IEnumerable<KeyValuePair<string, string>> GetParameter<T>(object
                     {
                         EnumHandlingMode.Numeric => ((int)propertyValue).ToKeyValuePair(keyName, culture),
                         EnumHandlingMode.StringLower => propertyValue.ToString().ToLower(culture).ToKeyValuePair(keyName, culture),
+                        EnumHandlingMode.StringUpper => propertyValue.ToString().ToUpper(culture).ToKeyValuePair(keyName, culture),
 
                         // default includes string handling
                         _ => propertyValue.ToKeyValuePair(keyName, culture)