diff --git a/src/Microsoft.OpenApi.Readers/V2/OpenApiV2VersionService.cs b/src/Microsoft.OpenApi.Readers/V2/OpenApiV2VersionService.cs
index 20490aca7..823a66c3d 100644
--- a/src/Microsoft.OpenApi.Readers/V2/OpenApiV2VersionService.cs
+++ b/src/Microsoft.OpenApi.Readers/V2/OpenApiV2VersionService.cs
@@ -30,7 +30,7 @@ public OpenApiV2VersionService(OpenApiDiagnostic diagnostic)
             Diagnostic = diagnostic;
         }
 
-        private IDictionary<Type, Func<ParseNode, object>> _loaders = new Dictionary<Type, Func<ParseNode, object>>
+        private Dictionary<Type, Func<ParseNode, object>> _loaders = new()
         {
             [typeof(IOpenApiAny)] = OpenApiV2Deserializer.LoadAny,
             [typeof(OpenApiContact)] = OpenApiV2Deserializer.LoadContact,
diff --git a/src/Microsoft.OpenApi.Readers/V3/OpenApiV3VersionService.cs b/src/Microsoft.OpenApi.Readers/V3/OpenApiV3VersionService.cs
index 011680d3d..5787a703b 100644
--- a/src/Microsoft.OpenApi.Readers/V3/OpenApiV3VersionService.cs
+++ b/src/Microsoft.OpenApi.Readers/V3/OpenApiV3VersionService.cs
@@ -32,7 +32,7 @@ public OpenApiV3VersionService(OpenApiDiagnostic diagnostic)
             Diagnostic = diagnostic;
         }
 
-        private IDictionary<Type, Func<ParseNode, object>> _loaders = new Dictionary<Type, Func<ParseNode, object>>
+        private Dictionary<Type, Func<ParseNode, object>> _loaders = new()
         {
             [typeof(IOpenApiAny)] = OpenApiV3Deserializer.LoadAny,
             [typeof(OpenApiCallback)] = OpenApiV3Deserializer.LoadCallback,
diff --git a/src/Microsoft.OpenApi/Validations/ValidationRuleSet.cs b/src/Microsoft.OpenApi/Validations/ValidationRuleSet.cs
index 6cc4d3a05..f8061ead3 100644
--- a/src/Microsoft.OpenApi/Validations/ValidationRuleSet.cs
+++ b/src/Microsoft.OpenApi/Validations/ValidationRuleSet.cs
@@ -17,11 +17,11 @@ namespace Microsoft.OpenApi.Validations
     /// </summary>
     public sealed class ValidationRuleSet : IEnumerable<ValidationRule>
     {
-        private IDictionary<Type, IList<ValidationRule>> _rules = new Dictionary<Type, IList<ValidationRule>>();
+        private Dictionary<Type, IList<ValidationRule>> _rules = new();
 
         private static ValidationRuleSet _defaultRuleSet;
 
-        private IList<ValidationRule> _emptyRules = new List<ValidationRule>();
+        private List<ValidationRule> _emptyRules = new();
 
         /// <summary>
         /// Retrieve the rules that are related to a specific type