diff --git a/Minio.Examples/Cases/SetBucketTags.cs b/Minio.Examples/Cases/SetBucketTags.cs
index 45777291..4211c5a3 100644
--- a/Minio.Examples/Cases/SetBucketTags.cs
+++ b/Minio.Examples/Cases/SetBucketTags.cs
@@ -1,4 +1,4 @@
-/*
+/*
  * MinIO .NET Library for Amazon S3 Compatible Cloud Storage, (C) 2020, 2021 MinIO, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -24,7 +24,7 @@ public static class SetBucketTags
     // Set Tags to the bucket
     public static async Task Run(IMinioClient minio,
         string bucketName = "my-bucket-name",
-        IDictionary<string, string> tags = null)
+        IReadOnlyDictionary<string, string> tags = null)
     {
         if (minio is null) throw new ArgumentNullException(nameof(minio));
 
diff --git a/Minio.Examples/Cases/SetObjectTags.cs b/Minio.Examples/Cases/SetObjectTags.cs
index 2c151ba3..c9ee8b35 100644
--- a/Minio.Examples/Cases/SetObjectTags.cs
+++ b/Minio.Examples/Cases/SetObjectTags.cs
@@ -1,4 +1,4 @@
-/*
+/*
  * MinIO .NET Library for Amazon S3 Compatible Cloud Storage, (C) 2020, 2021 MinIO, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -25,7 +25,7 @@ public static class SetObjectTags
     public static async Task Run(IMinioClient minio,
         string bucketName = "my-bucket-name",
         string objectName = "my-object-name",
-        IDictionary<string, string> tags = null,
+        IReadOnlyDictionary<string, string> tags = null,
         string versionId = null)
     {
         if (minio is null) throw new ArgumentNullException(nameof(minio));
diff --git a/Minio/DataModel/ILM/AndOperator.cs b/Minio/DataModel/ILM/AndOperator.cs
index a50ce35a..39d3242b 100644
--- a/Minio/DataModel/ILM/AndOperator.cs
+++ b/Minio/DataModel/ILM/AndOperator.cs
@@ -42,7 +42,7 @@ public AndOperator(string prefix, IList<Tag> tag)
             Tags = new Collection<Tag>(tag);
     }
 
-    public AndOperator(string prefix, IDictionary<string, string> tags)
+    public AndOperator(string prefix, IReadOnlyDictionary<string, string> tags)
     {
         Prefix = prefix;
         if (tags is null || tags.Count == 0)
diff --git a/Minio/DataModel/Replication/AndOperator.cs b/Minio/DataModel/Replication/AndOperator.cs
index ebc66965..50848b4f 100644
--- a/Minio/DataModel/Replication/AndOperator.cs
+++ b/Minio/DataModel/Replication/AndOperator.cs
@@ -50,7 +50,7 @@ public AndOperator(string prefix, ICollection<Tag> tag)
         Tags = tag;
     }
 
-    public AndOperator(string prefix, IDictionary<string, string> tags)
+    public AndOperator(string prefix, IReadOnlyDictionary<string, string> tags)
     {
         if (tags is null) throw new ArgumentNullException(nameof(tags));
 
diff --git a/Minio/DataModel/Tags/TagSet.cs b/Minio/DataModel/Tags/TagSet.cs
index d546ee8f..de89494a 100644
--- a/Minio/DataModel/Tags/TagSet.cs
+++ b/Minio/DataModel/Tags/TagSet.cs
@@ -1,4 +1,4 @@
-/*
+/*
  * MinIO .NET Library for Amazon S3 Compatible Cloud Storage, (C) 2020 MinIO, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -28,7 +28,7 @@ public TagSet()
         Tag = null;
     }
 
-    public TagSet(IDictionary<string, string> tags)
+    public TagSet(IReadOnlyDictionary<string, string> tags)
     {
         if (tags is null || tags.Count == 0) return;
         Tag = new Collection<Tag>();
diff --git a/Minio/DataModel/Tags/Tagging.cs b/Minio/DataModel/Tags/Tagging.cs
index 90539488..329c49d8 100644
--- a/Minio/DataModel/Tags/Tagging.cs
+++ b/Minio/DataModel/Tags/Tagging.cs
@@ -40,7 +40,7 @@ public Tagging()
         TaggingSet = null;
     }
 
-    public Tagging(IDictionary<string, string> tags, bool isObjects)
+    public Tagging(IReadOnlyDictionary<string, string> tags, bool isObjects)
     {
         if (tags is null)
         {
@@ -67,7 +67,7 @@ public Tagging(IDictionary<string, string> tags, bool isObjects)
     [XmlElement("TagSet")] public TagSet TaggingSet { get; set; }
 
     [XmlIgnore]
-    public IDictionary<string, string> Tags
+    public IReadOnlyDictionary<string, string> Tags
     {
         get
         {
@@ -133,12 +133,12 @@ public string MarshalXML()
         return str;
     }
 
-    public static Tagging GetBucketTags(IDictionary<string, string> tags)
+    public static Tagging GetBucketTags(IReadOnlyDictionary<string, string> tags)
     {
         return new Tagging(tags, false);
     }
 
-    public static Tagging GetObjectTags(IDictionary<string, string> tags)
+    public static Tagging GetObjectTags(IReadOnlyDictionary<string, string> tags)
     {
         return new Tagging(tags, true);
     }