diff --git a/src/Microsoft.OpenApi.Readers/ParseNodes/MapNode.cs b/src/Microsoft.OpenApi.Readers/ParseNodes/MapNode.cs
index 034a3e70c..7611eec2d 100644
--- a/src/Microsoft.OpenApi.Readers/ParseNodes/MapNode.cs
+++ b/src/Microsoft.OpenApi.Readers/ParseNodes/MapNode.cs
@@ -30,7 +30,7 @@ public MapNode(ParsingContext context, string yamlString) :
         public MapNode(ParsingContext context, YamlNode node) : base(
             context)
         {
-            if (!(node is YamlMappingNode mapNode))
+            if (node is not YamlMappingNode mapNode)
             {
                 throw new OpenApiReaderException("Expected map.", Context);
             }
diff --git a/src/Microsoft.OpenApi.Readers/ParseNodes/ParseNode.cs b/src/Microsoft.OpenApi.Readers/ParseNodes/ParseNode.cs
index f57f4927c..be39e0602 100644
--- a/src/Microsoft.OpenApi.Readers/ParseNodes/ParseNode.cs
+++ b/src/Microsoft.OpenApi.Readers/ParseNodes/ParseNode.cs
@@ -22,7 +22,7 @@ protected ParseNode(ParsingContext parsingContext)
 
         public MapNode CheckMapNode(string nodeName)
         {
-            if (!(this is MapNode mapNode))
+            if (this is not MapNode mapNode)
             {
                 throw new OpenApiReaderException($"{nodeName} must be a map/object", Context);
             }
diff --git a/src/Microsoft.OpenApi.Readers/ParseNodes/ValueNode.cs b/src/Microsoft.OpenApi.Readers/ParseNodes/ValueNode.cs
index bbce7a7d3..16bbee41d 100644
--- a/src/Microsoft.OpenApi.Readers/ParseNodes/ValueNode.cs
+++ b/src/Microsoft.OpenApi.Readers/ParseNodes/ValueNode.cs
@@ -15,7 +15,7 @@ internal class ValueNode : ParseNode
         public ValueNode(ParsingContext context, YamlNode node) : base(
             context)
         {
-            if (!(node is YamlScalarNode scalarNode))
+            if (node is not YamlScalarNode scalarNode)
             {
                 throw new OpenApiReaderException("Expected a value.", node);
             }
diff --git a/src/Microsoft.OpenApi/Validations/Rules/RuleHelpers.cs b/src/Microsoft.OpenApi/Validations/Rules/RuleHelpers.cs
index dc4b6d6c9..504938d75 100644
--- a/src/Microsoft.OpenApi/Validations/Rules/RuleHelpers.cs
+++ b/src/Microsoft.OpenApi/Validations/Rules/RuleHelpers.cs
@@ -135,7 +135,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "integer" && format == "int32")
             {
-                if (!(value is OpenApiInteger))
+                if (value is not OpenApiInteger)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -147,7 +147,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "integer" && format == "int64")
             {
-                if (!(value is OpenApiLong))
+                if (value is not OpenApiLong)
                 {
                     context.CreateWarning(
                        ruleName,
@@ -157,9 +157,9 @@ public static void ValidateDataTypeMismatch(
                 return;
             }
 
-            if (type == "integer" && !(value is OpenApiInteger))
+            if (type == "integer" && value is not OpenApiInteger)
             {
-                if (!(value is OpenApiInteger))
+                if (value is not OpenApiInteger)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -171,7 +171,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "number" && format == "float")
             {
-                if (!(value is OpenApiFloat))
+                if (value is not OpenApiFloat)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -183,7 +183,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "number" && format == "double")
             {
-                if (!(value is OpenApiDouble))
+                if (value is not OpenApiDouble)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -195,7 +195,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "number")
             {
-                if (!(value is OpenApiDouble))
+                if (value is not OpenApiDouble)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -207,7 +207,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "string" && format == "byte")
             {
-                if (!(value is OpenApiByte))
+                if (value is not OpenApiByte)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -219,7 +219,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "string" && format == "date")
             {
-                if (!(value is OpenApiDate))
+                if (value is not OpenApiDate)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -231,7 +231,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "string" && format == "date-time")
             {
-                if (!(value is OpenApiDateTime))
+                if (value is not OpenApiDateTime)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -243,7 +243,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "string" && format == "password")
             {
-                if (!(value is OpenApiPassword))
+                if (value is not OpenApiPassword)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -255,7 +255,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "string")
             {
-                if (!(value is OpenApiString))
+                if (value is not OpenApiString)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -267,7 +267,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type == "boolean")
             {
-                if (!(value is OpenApiBoolean))
+                if (value is not OpenApiBoolean)
                 {
                     context.CreateWarning(
                         ruleName,
diff --git a/src/Microsoft.OpenApi/Validations/ValidationRule.cs b/src/Microsoft.OpenApi/Validations/ValidationRule.cs
index fdbf5c330..97a66034d 100644
--- a/src/Microsoft.OpenApi/Validations/ValidationRule.cs
+++ b/src/Microsoft.OpenApi/Validations/ValidationRule.cs
@@ -59,7 +59,7 @@ internal override void Evaluate(IValidationContext context, object item)
                 return;
             }
 
-            if (!(item is T))
+            if (item is not T)
             {
                 throw Error.Argument(string.Format(SRResource.InputItemShouldBeType, typeof(T).FullName));
             }
diff --git a/test/Microsoft.OpenApi.SmokeTests/ApiGurus.cs b/test/Microsoft.OpenApi.SmokeTests/ApiGurus.cs
index 55a32ff71..8c084eae0 100644
--- a/test/Microsoft.OpenApi.SmokeTests/ApiGurus.cs
+++ b/test/Microsoft.OpenApi.SmokeTests/ApiGurus.cs
@@ -61,7 +61,7 @@ public static IEnumerable<object[]> GetSchemas()
 
             JToken GetProp(JToken obj, string prop)
             {
-                if (!(obj is JObject jObj))
+                if (obj is not JObject jObj)
                     return null;
                 if (!jObj.TryGetValue(prop, out var jToken))
                     return null;