diff --git a/Sources/ZcashLightClientKit/Service/LightWalletGRPCService.swift b/Sources/ZcashLightClientKit/Service/LightWalletGRPCService.swift
index b023a30d..3dbcfbbc 100644
--- a/Sources/ZcashLightClientKit/Service/LightWalletGRPCService.swift
+++ b/Sources/ZcashLightClientKit/Service/LightWalletGRPCService.swift
@@ -10,6 +10,7 @@ import Foundation
 import GRPC
 import NIO
 import NIOHPACK
+import NIOTransportServices
 
 public typealias Channel = GRPC.GRPCChannel
 
@@ -127,8 +128,8 @@ public class LightWalletGRPCService {
         self.singleCallTimeout = TimeLimit.timeout(.milliseconds(singleCallTimeout))
 
         let connectionBuilder = secure ?
-        ClientConnection.usingPlatformAppropriateTLS(for: MultiThreadedEventLoopGroup(numberOfThreads: 1)) :
-        ClientConnection.insecure(group: MultiThreadedEventLoopGroup(numberOfThreads: 1))
+        ClientConnection.usingPlatformAppropriateTLS(for: NIOTSEventLoopGroup(loopCount: 1, defaultQoS: .default)) :
+        ClientConnection.insecure(group: NIOTSEventLoopGroup(loopCount: 1, defaultQoS: .default))
 
         let channel = connectionBuilder
             .withConnectivityStateDelegate(connectionManager, executingOn: queue)
diff --git a/Tests/TestUtils/Tests+Utils.swift b/Tests/TestUtils/Tests+Utils.swift
index 4d110bc1..d86f11e0 100644
--- a/Tests/TestUtils/Tests+Utils.swift
+++ b/Tests/TestUtils/Tests+Utils.swift
@@ -11,6 +11,7 @@ import GRPC
 import ZcashLightClientKit
 import XCTest
 import NIO
+import NIOTransportServices
 
 enum Environment {
     static let lightwalletdKey = "LIGHTWALLETD_ADDRESS"
@@ -40,8 +41,8 @@ class ChannelProvider {
         let endpoint = LightWalletEndpointBuilder.default
 
         let connectionBuilder = secure ?
-        ClientConnection.usingPlatformAppropriateTLS(for: MultiThreadedEventLoopGroup(numberOfThreads: 1)) :
-        ClientConnection.insecure(group: MultiThreadedEventLoopGroup(numberOfThreads: 1))
+        ClientConnection.usingPlatformAppropriateTLS(for: NIOTSEventLoopGroup(loopCount: 1, defaultQoS: .default)) :
+        ClientConnection.insecure(group: NIOTSEventLoopGroup(loopCount: 1, defaultQoS: .default))
 
         let channel = connectionBuilder
             .withKeepalive(