diff --git a/CHANGELOG.md b/CHANGELOG.md
index c1563f9..aef0a95 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,11 @@ All notable changes to this project will be documented in this file.  The format
 [comment]: <> (Fixed:      any bug fixes)
 [comment]: <> (Security:   in case of vulnerabilities)
 
+## [1.1.1]
+
+### Fixed
+* Skip `block_identifier` param if `Hash` value is `null` in RPC requests to be compatible with Casper node v150.
+
 ## [1.1.0]
 
 ### Added
@@ -28,5 +33,6 @@ All notable changes to this project will be documented in this file.  The format
 ### Added
 * Initial release of Casper .NET SDK.
 
+[1.1.1]: https://github.com/make-software/casper-net-sdk/releases/tag/v1.1.1
 [1.1.0]: https://github.com/make-software/casper-net-sdk/releases/tag/v1.1.0
 [1.0.0]: https://github.com/make-software/casper-net-sdk/releases/tag/v1.0.0
diff --git a/Casper.Network.SDK/Casper.Network.SDK.csproj b/Casper.Network.SDK/Casper.Network.SDK.csproj
index 7fbcff5..699e5d0 100644
--- a/Casper.Network.SDK/Casper.Network.SDK.csproj
+++ b/Casper.Network.SDK/Casper.Network.SDK.csproj
@@ -2,9 +2,9 @@
 
     <PropertyGroup>
         <TargetFramework>net5.0</TargetFramework>
-        <AssemblyVersion>1.1.0.0</AssemblyVersion>
-        <FileVersion>1.1.0</FileVersion>
-        <PackageVersion>1.1.0</PackageVersion>
+        <AssemblyVersion>1.1.1.0</AssemblyVersion>
+        <FileVersion>1.1.1</FileVersion>
+        <PackageVersion>1.1.1</PackageVersion>
         <Title>Casper.Network.SDK</Title>
         <Authors>make-software</Authors>
         <PackageProjectUrl>https://github.com/make-software/casper-net-sdk</PackageProjectUrl>
@@ -20,7 +20,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="BouncyCastle.NetCore" Version="1.8.8" />
+      <PackageReference Include="BouncyCastle.NetCore" Version="1.9.0" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/Casper.Network.SDK/JsonRpc/CasperMethods.cs b/Casper.Network.SDK/JsonRpc/CasperMethods.cs
index dc737ec..0834a1d 100644
--- a/Casper.Network.SDK/JsonRpc/CasperMethods.cs
+++ b/Casper.Network.SDK/JsonRpc/CasperMethods.cs
@@ -10,34 +10,16 @@ public class GetStateRootHash : RpcMethod
         /// Returns a state root hash at a given Block
         /// </summary>
         /// <param name="blockHash">Block hash for which the state root is queried. Null for the most recent.</param>
-        public GetStateRootHash(string blockHash = null) : base("chain_get_state_root_hash")
+        public GetStateRootHash(string blockHash = null) : base("chain_get_state_root_hash", blockHash)
         {
-            var blockIdentifier = new Dictionary<string, string>
-            {
-                {"Hash", blockHash}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockHash != null ? blockIdentifier : null}
-            };
         }
 
         /// <summary>
         /// Returns the state root hash at a given Block
         /// </summary>
         /// <param name="height">Block height for which the state root is queried.</param>
-        public GetStateRootHash(int height) : base("chain_get_state_root_hash")
+        public GetStateRootHash(int height) : base("chain_get_state_root_hash", height)
         {
-            var blockIdentifier = new Dictionary<string, int>
-            {
-                {"Height", height}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockIdentifier}
-            };
         }
     }
 
@@ -67,34 +49,16 @@ public class GetAuctionInfo : RpcMethod
         /// Returns the bids and validators at a given block.
         /// </summary>
         /// <param name="blockHash">Block hash for which the auction info is queried. Null for the most recent auction info.</param>
-        public GetAuctionInfo(string blockHash) : base("state_get_auction_info")
+        public GetAuctionInfo(string blockHash) : base("state_get_auction_info", blockHash)
         {
-            var blockIdentifier = new Dictionary<string, string>
-            {
-                {"Hash", blockHash}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockHash != null ? blockIdentifier : null}
-            };
         }
 
         /// <summary>
         /// Returns the bids and validators at a given block.
         /// </summary>
         /// <param name="height">Block height for which the auction info is queried.</param>
-        public GetAuctionInfo(int height) : base("state_get_auction_info")
+        public GetAuctionInfo(int height) : base("state_get_auction_info", height)
         {
-            var blockIdentifier = new Dictionary<string, int>
-            {
-                {"Height", height}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockIdentifier}
-            };
         }
     }
 
@@ -105,18 +69,9 @@ public class GetAccountInfo : RpcMethod
         /// </summary>
         /// <param name="publicKey">The public key of the account.</param>
         /// <param name="blockHash">A block hash for which the information of the account is queried. Null for most recent information.</param>
-        public GetAccountInfo(string publicKey, string blockHash = null) : base("state_get_account_info")
+        public GetAccountInfo(string publicKey, string blockHash = null) : base("state_get_account_info", blockHash)
         {
-            var blockIdentifier = new Dictionary<string, string>
-            {
-                {"Hash", blockHash}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockHash != null ? blockIdentifier : null},
-                {"public_key", publicKey}
-            };
+            this.Parameters.Add("public_key", publicKey);
         }
 
         /// <summary>
@@ -124,18 +79,9 @@ public GetAccountInfo(string publicKey, string blockHash = null) : base("state_g
         /// </summary>
         /// <param name="publicKey">The public key of the account.</param>
         /// <param name="height">A block height for which the information of the account is queried.</param>
-        public GetAccountInfo(string publicKey, int height) : base("state_get_account_info")
+        public GetAccountInfo(string publicKey, int height) : base("state_get_account_info", height)
         {
-            var blockIdentifier = new Dictionary<string, int>
-            {
-                {"Height", height}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockIdentifier},
-                {"public_key", publicKey}
-            };
+            this.Parameters.Add("public_key", publicKey);
         }
     }
     
@@ -244,34 +190,16 @@ public class GetBlock : RpcMethod
         /// Retrieves a Block from the network by its hash. 
         /// </summary>
         /// <param name="blockHash">Hash of the block to retrieve. Null for the most recent block.</param>
-        public GetBlock(string blockHash) : base("chain_get_block")
+        public GetBlock(string blockHash) : base("chain_get_block", blockHash)
         {
-            var blockIdentifier = new Dictionary<string, string>
-            {
-                {"Hash", blockHash}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockHash != null ? blockIdentifier : null}
-            };
         }
 
         /// <summary>
         /// Retrieves a Block from the network by its height number.
         /// </summary>
         /// <param name="height">Height of the block to retrieve.</param>
-        public GetBlock(int height) : base("chain_get_block")
+        public GetBlock(int height) : base("chain_get_block", height)
         {
-            var blockIdentifier = new Dictionary<string, int>
-            {
-                {"Height", height}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockIdentifier}
-            };
         }
     }
 
@@ -281,34 +209,16 @@ public class GetBlockTransfers : RpcMethod
         /// Retrieves all transfers for a Block from the network
         /// </summary>
         /// <param name="blockHash">Hash of the block to retrieve the transfers from. Null for the most recent block</param>
-        public GetBlockTransfers(string blockHash) : base("chain_get_block_transfers")
+        public GetBlockTransfers(string blockHash) : base("chain_get_block_transfers", blockHash)
         {
-            var blockIdentifier = new Dictionary<string, string>
-            {
-                {"Hash", blockHash}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockHash != null ? blockIdentifier : null}
-            };
         }
 
         /// <summary>
         /// Retrieves all transfers for a Block from the network
         /// </summary>
         /// <param name="height">Height of the block to retrieve the transfers from.</param>
-        public GetBlockTransfers(int height) : base("chain_get_block_transfers")
+        public GetBlockTransfers(int height) : base("chain_get_block_transfers", height)
         {
-            var blockIdentifier = new Dictionary<string, int>
-            {
-                {"Height", height}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockIdentifier}
-            };
         }
     }
 
@@ -318,34 +228,16 @@ public class GetEraInfoBySwitchBlock : RpcMethod
         /// Retrieves an EraInfo from the network given a switch block 
         /// </summary>
         /// <param name="blockHash">Block hash of a switch block.</param>
-        public GetEraInfoBySwitchBlock(string blockHash) : base("chain_get_era_info_by_switch_block")
+        public GetEraInfoBySwitchBlock(string blockHash) : base("chain_get_era_info_by_switch_block", blockHash)
         {
-            var blockIdentifier = new Dictionary<string, string>
-            {
-                {"Hash", blockHash}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockHash != null ? blockIdentifier : null}
-            };
         }
 
         /// <summary>
         /// Retrieves an EraInfo from the network given a switch block.
         /// </summary>
         /// <param name="height">Block height of a switch block.</param>
-        public GetEraInfoBySwitchBlock(int height) : base("chain_get_era_info_by_switch_block")
+        public GetEraInfoBySwitchBlock(int height) : base("chain_get_era_info_by_switch_block", height)
         {
-            var blockIdentifier = new Dictionary<string, int>
-            {
-                {"Height", height}
-            };
-
-            this.Parameters = new Dictionary<string, object>
-            {
-                {"block_identifier", blockIdentifier}
-            };
         }
     }
 
@@ -476,4 +368,4 @@ public GetRpcSchema() : base("rpc.discover")
         {
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Casper.Network.SDK/JsonRpc/RpcMethod.cs b/Casper.Network.SDK/JsonRpc/RpcMethod.cs
index 75c03f1..3e17c8d 100644
--- a/Casper.Network.SDK/JsonRpc/RpcMethod.cs
+++ b/Casper.Network.SDK/JsonRpc/RpcMethod.cs
@@ -57,6 +57,40 @@ public RpcMethod(string method)
             this.Method = method;
         }
 
+        public RpcMethod(string method, string blockHash)
+        {
+            this.Method = method;
+
+            this.Parameters = blockHash switch
+            {
+                null => new Dictionary<string, object>(),
+                _ => new Dictionary<string, object>
+                {
+                    {
+                        "block_identifier", new Dictionary<string, string>
+                        {
+                            {"Hash", blockHash}
+                        }
+                    }
+                }
+            };
+        }
+
+        public RpcMethod(string method, int blockHeight)
+        {
+            this.Method = method;
+
+            var blockIdentifier = new Dictionary<string, int>
+            {
+                {"Height", blockHeight}
+            };
+
+            this.Parameters = new Dictionary<string, object>
+            {
+                {"block_identifier", blockIdentifier}
+            };
+        }
+
         /// <summary>
         /// Converts an RpcMethod derived object a JSON string that can be sent to the network  
         /// </summary>
@@ -65,4 +99,4 @@ public string Serialize()
             return JsonSerializer.Serialize(this, typeof(RpcMethod), SerializerOptions);
         }
     }
-}
\ No newline at end of file
+}