diff --git a/ArchiSteamFarm/ArchiSteamFarm.csproj b/ArchiSteamFarm/ArchiSteamFarm.csproj
index 51547b462..2fe3340bf 100644
--- a/ArchiSteamFarm/ArchiSteamFarm.csproj
+++ b/ArchiSteamFarm/ArchiSteamFarm.csproj
@@ -78,6 +78,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net48'">
+    <PackageReference Include="IndexRange" Version="1.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Cors" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.HttpOverrides" Version="2.2.0" />
diff --git a/ArchiSteamFarm/Bot.cs b/ArchiSteamFarm/Bot.cs
index 4e9b0fed5..7ccf2c637 100755
--- a/ArchiSteamFarm/Bot.cs
+++ b/ArchiSteamFarm/Bot.cs
@@ -929,7 +929,7 @@ namespace ArchiSteamFarm {
 						}
 
 						string name = parsedArgs[0];
-						string key = parsedArgs[parsedArgs.Length - 1];
+						string key = parsedArgs[^1];
 
 						gamesToRedeemInBackground[key] = name;
 					}
@@ -1634,7 +1634,7 @@ namespace ArchiSteamFarm {
 						continue;
 					}
 
-					string key = parsedArgs[parsedArgs.Length - 1];
+					string key = parsedArgs[^1];
 
 					if (!Utilities.IsValidCdKey(key)) {
 						ArchiLogger.LogGenericWarning(string.Format(Strings.ErrorIsInvalid, key));
diff --git a/ArchiSteamFarm/MobileAuthenticator.cs b/ArchiSteamFarm/MobileAuthenticator.cs
index 79de7c09b..d54e7f034 100644
--- a/ArchiSteamFarm/MobileAuthenticator.cs
+++ b/ArchiSteamFarm/MobileAuthenticator.cs
@@ -387,7 +387,7 @@ namespace ArchiSteamFarm {
 			}
 
 			// The last 4 bits of the mac say where the code starts
-			int start = hash[hash.Length - 1] & 0x0f;
+			int start = hash[^1] & 0x0f;
 
 			// Extract those 4 bytes
 			byte[] bytes = new byte[4];
diff --git a/ArchiSteamFarm/Utilities.cs b/ArchiSteamFarm/Utilities.cs
index 7d0a2de07..c33a285cf 100644
--- a/ArchiSteamFarm/Utilities.cs
+++ b/ArchiSteamFarm/Utilities.cs
@@ -59,7 +59,7 @@ namespace ArchiSteamFarm {
 
 			string[] args = text.Split((char[]) null, argsToSkip + 1, StringSplitOptions.RemoveEmptyEntries);
 
-			return args[args.Length - 1];
+			return args[^1];
 		}
 
 		[PublicAPI]