diff --git a/src/Elasticsearch.Net/Connection/MetaData/MetaDataHeader.cs b/src/Elasticsearch.Net/Connection/MetaData/MetaDataHeader.cs
index 2d332817c85..367f6c70a58 100644
--- a/src/Elasticsearch.Net/Connection/MetaData/MetaDataHeader.cs
+++ b/src/Elasticsearch.Net/Connection/MetaData/MetaDataHeader.cs
@@ -20,12 +20,13 @@ public MetaDataHeader(VersionInfo version, string serviceIdentifier, bool isAsyn
 			ServiceIdentifier = serviceIdentifier;
 			RuntimeVersion = RuntimeVersionString;
 
-			// This code is expected to be called infrequently so we're not concerns with over optimising this
+			// This code is expected to be called infrequently so we're not concerned with over optimising this.
 
 			_headerValue = new StringBuilder(64)
 				.Append(serviceIdentifier).Append("=").Append(ClientVersion).Append(Separator)
-				.Append("a=").Append(isAsync ? "1" : "0").Append(Separator)
 				.Append("net=").Append(RuntimeVersion).Append(Separator)
+				.Append("t=").Append(ClientVersion).Append(Separator)
+				.Append("a=").Append(isAsync ? "1" : "0").Append(Separator)
 				.Append(HttpClientIdentifier).Append("=").Append(RuntimeVersion)
 				.ToString();
 		}
diff --git a/tests/Tests/Connection/MetaData/MetaHeaderProviderTests.cs b/tests/Tests/Connection/MetaData/MetaHeaderProviderTests.cs
index b498a16155e..fd756ec48fc 100644
--- a/tests/Tests/Connection/MetaData/MetaHeaderProviderTests.cs
+++ b/tests/Tests/Connection/MetaData/MetaHeaderProviderTests.cs
@@ -12,9 +12,8 @@ namespace Tests.Connection.MetaData
 {
 	public class MetaHeaderProviderTests
 	{
-		private readonly Regex _validHeaderRegex = new Regex(@"^[a-z]{1,}=[a-z0-9\.\-]{1,}(?:,[a-z]{1,}=[a-z0-9\.\-]+)*$");
-		private readonly Regex _validVersionRegex = new Regex(@"^[0-9]{1,2}\.[0-9]{1,2}(?:\.[0-9]{1,3})?p?$");
-		private readonly Regex _validHttpClientPart = new Regex(@"^[a-z]{2,3}=[0-9]{1,2}\.[0-9]{1,2}(?:\.[0-9]{1,3})?p?$");
+		private readonly Regex _validHeaderRegex = new(@"^[a-z]{1,}=[a-z0-9\.\-]{1,}(?:,[a-z]{1,}=[a-z0-9\.\-]+)*$");
+		private readonly Regex _validVersionRegex = new(@"^[0-9]{1,2}\.[0-9]{1,2}(?:\.[0-9]{1,3})?p?$");
 
 		[U] public void HeaderName_ReturnsExpectedValue()
 		{
@@ -54,19 +53,25 @@ [U] public void HeaderName_ReturnsExpectedValue_ForSyncRequest_WhenNotDisabled()
 			_validHeaderRegex.Match(result).Success.Should().BeTrue();
 
 			var parts = result.Split(',');
-			parts.Length.Should().Be(4);
+			parts.Length.Should().Be(5);
 
 			parts[0].Should().StartWith("es=");
 			var clientVersion = parts[0].Substring(3);
 			_validVersionRegex.Match(clientVersion).Success.Should().BeTrue();
 
-			parts[1].Should().Be("a=0");
-
-			parts[2].Should().StartWith("net=");
-			var runtimeVersion = parts[2].Substring(4);
+			parts[1].Should().StartWith("net=");
+			var runtimeVersion = parts[1].Substring(4);
 			_validVersionRegex.Match(runtimeVersion).Success.Should().BeTrue();
 
-			_validHttpClientPart.Match(parts[3]).Success.Should().BeTrue();
+			parts[2].Should().StartWith("t=");
+			clientVersion = parts[2].Substring(2);
+			_validVersionRegex.Match(clientVersion).Success.Should().BeTrue();
+
+			parts[3].Should().Be("a=0");
+
+			parts[4].Should().StartWith("so=");
+			var socketVersion = parts[4].Substring(3);
+			_validVersionRegex.Match(socketVersion).Success.Should().BeTrue();
 		}
 
 		[U] public void HeaderName_ReturnsExpectedValue_ForAsyncRequest_WhenNotDisabled()
@@ -87,19 +92,25 @@ [U] public void HeaderName_ReturnsExpectedValue_ForAsyncRequest_WhenNotDisabled(
 			_validHeaderRegex.Match(result).Success.Should().BeTrue();
 
 			var parts = result.Split(',');
-			parts.Length.Should().Be(4);
+			parts.Length.Should().Be(5);
 
 			parts[0].Should().StartWith("es=");
 			var clientVersion = parts[0].Substring(3);
 			_validVersionRegex.Match(clientVersion).Success.Should().BeTrue();
 
-			parts[1].Should().Be("a=1");
-
-			parts[2].Should().StartWith("net=");
+			parts[1].Should().StartWith("net=");
 			var runtimeVersion = parts[2].Substring(4);
 			_validVersionRegex.Match(runtimeVersion).Success.Should().BeTrue();
 
-			_validHttpClientPart.Match(parts[3]).Success.Should().BeTrue();
+			parts[2].Should().StartWith("t=");
+			clientVersion = parts[2].Substring(2);
+			_validVersionRegex.Match(clientVersion).Success.Should().BeTrue();
+
+			parts[3].Should().Be("a=1");
+
+			parts[4].Should().StartWith("so=");
+			var socketVersion = parts[4].Substring(3);
+			_validVersionRegex.Match(socketVersion).Success.Should().BeTrue();
 		}
 	}
 }