diff --git a/Package.swift b/Package.swift
index 47da793..c0dec9a 100644
--- a/Package.swift
+++ b/Package.swift
@@ -43,7 +43,7 @@ let dependencies: [Package.Dependency] = [
   ),
   .package(
     url: "https://github.com/apple/swift-nio-http2.git",
-    from: "1.38.0"
+    from: "1.42.0"
   ),
   .package(
     url: "https://github.com/apple/swift-nio-transport-services.git",
diff --git a/Sources/GRPCNIOTransportCore/Internal/NIOChannelPipeline+GRPC.swift b/Sources/GRPCNIOTransportCore/Internal/NIOChannelPipeline+GRPC.swift
index 12e9dbb..c4e02f2 100644
--- a/Sources/GRPCNIOTransportCore/Internal/NIOChannelPipeline+GRPC.swift
+++ b/Sources/GRPCNIOTransportCore/Internal/NIOChannelPipeline+GRPC.swift
@@ -65,6 +65,7 @@ extension ChannelPipeline.SynchronousOperations {
     let clampedMaxFrameSize = self.clampMaxFrameSize(http2Config.maxFrameSize)
 
     var http2HandlerConnectionConfiguration = NIOHTTP2Handler.ConnectionConfiguration()
+    http2HandlerConnectionConfiguration.targetWindowSize = clampedTargetWindowSize
     var http2HandlerHTTP2Settings = HTTP2Settings([
       HTTP2Setting(parameter: .initialWindowSize, value: clampedTargetWindowSize),
       HTTP2Setting(parameter: .maxFrameSize, value: clampedMaxFrameSize),
@@ -137,6 +138,7 @@ extension ChannelPipeline.SynchronousOperations {
     // Use NIOs defaults as a starting point.
     var http2 = NIOHTTP2Handler.Configuration()
     http2.stream.targetWindowSize = clampedTargetWindowSize
+    http2.connection.targetWindowSize = clampedTargetWindowSize
     http2.connection.initialSettings = [
       // Disallow servers from creating push streams.
       HTTP2Setting(parameter: .enablePush, value: 0),