diff --git a/DotnetToolset.Patterns/Dddd/Enums/RuleType.cs b/DotnetToolset.Patterns/Dddd/Enums/RuleType.cs
index 43e6416..efceeeb 100644
--- a/DotnetToolset.Patterns/Dddd/Enums/RuleType.cs
+++ b/DotnetToolset.Patterns/Dddd/Enums/RuleType.cs
@@ -1,4 +1,4 @@
-namespace DotnetToolset.Patterns.Dddd.Interfaces
+namespace DotnetToolset.Patterns.Dddd.Enums
 {
 	/// <summary>
 	/// Types of rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/CurrencyRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/CurrencyRule.cs
index 07d739b..4785f62 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/CurrencyRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/CurrencyRule.cs
@@ -1,6 +1,7 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
@@ -11,8 +12,7 @@ public class CurrencyRule : IRule
 		/// <summary>
 		/// Constructor to set the rule value
 		/// </summary>
-		/// <param name="amount"></param>
-		public CurrencyRule()
+        public CurrencyRule()
 		{
 			Rule = new KeyValuePair<RuleType, object>(RuleType.Currency, null);
 		}
@@ -28,13 +28,15 @@ public CurrencyRule()
 		/// <param name="value">Data to be validated</param>
 		/// <returns>True if rule passed and an optional error message</returns>
 		public (bool isValid, string errorMessage) Validate(object value)
-		{
-			if (value != null && (decimal)value >= 0)
+        {
+            if (value != null && (decimal)value >= 0)
 			{
 				return (true, null);
 			}
 
-			return (false, Res.p_RuleCurrencyNotPassed.ParseParameters(new object[] { value?.ToString(), (decimal)value }));
-		}
+            if (value != null)
+                return (false,
+                    Res.p_RuleCurrencyNotPassed.ParseParameters(new object[] { value?.ToString(), (decimal)value }));
+        }
 	}
 }
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/GreaterThanSubjectRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/GreaterThanSubjectRule.cs
index e225d2f..d83d6d6 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/GreaterThanSubjectRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/GreaterThanSubjectRule.cs
@@ -1,5 +1,6 @@
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
 {
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsIntegerRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsIntegerRule.cs
index 98ee67c..4286589 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsIntegerRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsIntegerRule.cs
@@ -1,5 +1,6 @@
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
@@ -27,7 +28,7 @@ public IsIntegerRule()
 		/// <returns>True if rule passed and an optional error message</returns>
 		public (bool isValid, string errorMessage) Validate(object value)
 		{
-			if (value != null && int.TryParse(value.ToString(), out int parsedValue))
+			if (value != null && int.TryParse(value.ToString(), out _))
 			{
 				return (true, null);
 			}
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsNotNullRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsNotNullRule.cs
index 245656e..e41f586 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsNotNullRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/IsNotNullRule.cs
@@ -1,5 +1,6 @@
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/LowerThanSubjectRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/LowerThanSubjectRule.cs
index 241f5aa..903208e 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/LowerThanSubjectRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/LowerThanSubjectRule.cs
@@ -1,5 +1,6 @@
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
 {
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxLengthRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxLengthRule.cs
index a42782c..72f1352 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxLengthRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxLengthRule.cs
@@ -1,6 +1,7 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxRule.cs
index 43e9219..e02209a 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MaxRule.cs
@@ -1,6 +1,7 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinLengthRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinLengthRule.cs
index 764b921..74ce8ba 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinLengthRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinLengthRule.cs
@@ -1,6 +1,7 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinRule.cs
index 2290992..2675e30 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/MinRule.cs
@@ -1,6 +1,7 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/RangeRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/RangeRule.cs
index d9d0ee5..602e8f8 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/RangeRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/RangeRule.cs
@@ -1,6 +1,7 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
diff --git a/DotnetToolset.Patterns/Dddd/Implementations/Rules/RegexRule.cs b/DotnetToolset.Patterns/Dddd/Implementations/Rules/RegexRule.cs
index a87bd65..a081888 100644
--- a/DotnetToolset.Patterns/Dddd/Implementations/Rules/RegexRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Implementations/Rules/RegexRule.cs
@@ -1,8 +1,8 @@
 using DotnetToolset.ExtensionMethods;
 using DotnetToolset.Patterns.Dddd.Interfaces;
-using System;
 using System.Collections.Generic;
 using System.Text.RegularExpressions;
+using DotnetToolset.Patterns.Dddd.Enums;
 using Res = DotnetToolset.Patterns.Resources.Literals;
 
 namespace DotnetToolset.Patterns.Dddd.Implementations.Rules
@@ -43,12 +43,12 @@ public RegexRule(string regex, bool skipWhenEmpty = false)
 				return (true, Res.p_RuleRegexSkipped.ParseParameter(value.ToString()));
 			}
 
-			if (!String.IsNullOrEmpty((string)value) && match.Success)
+			if (!string.IsNullOrEmpty((string)value) && match.Success)
 			{
 				return (true, null);
 			}
 
-			return (false, Res.p_RuleRegexNotPassed.ParseParameters(new[] { value?.ToString(), Rule.Value }));
+			return (false, Res.p_RuleRegexNotPassed.ParseParameters(new[] { value.ToString(), Rule.Value }));
 		}
 	}
 }
diff --git a/DotnetToolset.Patterns/Dddd/Interfaces/IRule.cs b/DotnetToolset.Patterns/Dddd/Interfaces/IRule.cs
index c75a30b..9b4afe3 100644
--- a/DotnetToolset.Patterns/Dddd/Interfaces/IRule.cs
+++ b/DotnetToolset.Patterns/Dddd/Interfaces/IRule.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using DotnetToolset.Patterns.Dddd.Enums;
 
 namespace DotnetToolset.Patterns.Dddd.Interfaces
 {
diff --git a/DotnetToolset.Patterns/Dddd/Interfaces/IRuleset.cs b/DotnetToolset.Patterns/Dddd/Interfaces/IRuleset.cs
index f022b71..18296c7 100644
--- a/DotnetToolset.Patterns/Dddd/Interfaces/IRuleset.cs
+++ b/DotnetToolset.Patterns/Dddd/Interfaces/IRuleset.cs
@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
+using DotnetToolset.Patterns.Dddd.Enums;
 
 namespace DotnetToolset.Patterns.Dddd.Interfaces
 {
diff --git a/DotnetToolset.Patterns/Dddd/Interfaces/IRulesetSubject.cs b/DotnetToolset.Patterns/Dddd/Interfaces/IRulesetSubject.cs
index 52b3cbf..444df6c 100644
--- a/DotnetToolset.Patterns/Dddd/Interfaces/IRulesetSubject.cs
+++ b/DotnetToolset.Patterns/Dddd/Interfaces/IRulesetSubject.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using DotnetToolset.Patterns.Dddd.Enums;
 
 namespace DotnetToolset.Patterns.Dddd.Interfaces
 {
diff --git a/DotnetToolset.Patterns/DotnetToolset.Patterns.csproj b/DotnetToolset.Patterns/DotnetToolset.Patterns.csproj
index 888738a..63d3aac 100644
--- a/DotnetToolset.Patterns/DotnetToolset.Patterns.csproj
+++ b/DotnetToolset.Patterns/DotnetToolset.Patterns.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.1</TargetFramework>
 	  <RootNamespace>DotnetToolset.Patterns</RootNamespace>
-	  <Version>0.13.0</Version>
+	  <Version>0.13.1</Version>
 	  <Authors>Ahead Labs, S.L.</Authors>
 	  <Description>Opinionated miscellaneous patterns for multilayered .NET projects.</Description>
 	  <Copyright>Ahead Labs, S.L.</Copyright>