diff --git a/client_options.go b/client_options.go
index 7ee277d..9653d1b 100644
--- a/client_options.go
+++ b/client_options.go
@@ -18,6 +18,9 @@ type TransportOptions struct {
 	MaxResponseHeaderBytes int64 // Zero means to use a default limit.
 	WriteBufferSize        int   // If zero, a default (currently 4KB) is used.
 	ReadBufferSize         int   // If zero, a default (currently 4KB) is used.
+	// IdleConnTimeout is the maximum amount of time an idle (keep-alive)
+	// connection will remain idle before closing itself. Zero means no limit.
+	IdleConnTimeout time.Duration
 }
 
 type BadPinHandlerFunc func(req *http.Request)
diff --git a/go.mod b/go.mod
index 95ebb63..8a4db1b 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/bogdanfinn/tls-client
 go 1.18
 
 require (
-	github.com/bogdanfinn/fhttp v0.5.20
+	github.com/bogdanfinn/fhttp v0.5.21-public-test
 	github.com/bogdanfinn/utls v1.5.16
 	github.com/google/uuid v1.3.0
 	github.com/stretchr/testify v1.8.0
diff --git a/go.sum b/go.sum
index 5cdb0e3..1722417 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=
 github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/bogdanfinn/fhttp v0.5.20 h1:joQrA0tVFBQNQ8BbKRmIM972GfawXA+qbCRQlX6dauQ=
-github.com/bogdanfinn/fhttp v0.5.20/go.mod h1:brqi5woc5eSCVHdKYBV8aZLbO7HGqpwyDLeXW+fT18I=
+github.com/bogdanfinn/fhttp v0.5.21-public-test h1:3/NtlIawWB+9zaekAF8ZVcLd9jFqiQi8g07ycUiKo0s=
+github.com/bogdanfinn/fhttp v0.5.21-public-test/go.mod h1:brqi5woc5eSCVHdKYBV8aZLbO7HGqpwyDLeXW+fT18I=
 github.com/bogdanfinn/utls v1.5.16 h1:NhhWkegEcYETBMj9nvgO4lwvc6NcLH+znrXzO3gnw4M=
 github.com/bogdanfinn/utls v1.5.16/go.mod h1:mHeRCi69cUiEyVBkKONB1cAbLjRcZnlJbGzttmiuK4o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
diff --git a/roundtripper.go b/roundtripper.go
index 3fd130d..cbc701f 100644
--- a/roundtripper.go
+++ b/roundtripper.go
@@ -7,6 +7,7 @@ import (
 	"net"
 	"strings"
 	"sync"
+	"time"
 
 	http "github.com/bogdanfinn/fhttp"
 	"github.com/bogdanfinn/fhttp/http2"
@@ -141,7 +142,19 @@ func (rt *roundTripper) dialTLS(ctx context.Context, network, addr string) (net.
 			utlsConfig.ServerName = rt.serverNameOverwrite
 		}
 
-		t2 := http2.Transport{DialTLS: rt.dialTLSHTTP2, TLSClientConfig: utlsConfig, ConnectionFlow: rt.connectionFlow, HeaderPriority: rt.headerPriority}
+		idleConnectionTimeout := 90 * time.Second
+
+		if rt.transportOptions != nil {
+			idleConnectionTimeout = rt.transportOptions.IdleConnTimeout
+		}
+
+		t2 := http2.Transport{
+			DialTLS:         rt.dialTLSHTTP2,
+			TLSClientConfig: utlsConfig,
+			ConnectionFlow:  rt.connectionFlow,
+			HeaderPriority:  rt.headerPriority,
+			IdleConnTimeout: idleConnectionTimeout,
+		}
 
 		if rt.transportOptions != nil {
 			t1 := t2.GetT1()
@@ -154,6 +167,7 @@ func (rt *roundTripper) dialTLS(ctx context.Context, network, addr string) (net.
 				t1.MaxResponseHeaderBytes = rt.transportOptions.MaxResponseHeaderBytes
 				t1.WriteBufferSize = rt.transportOptions.WriteBufferSize
 				t1.ReadBufferSize = rt.transportOptions.ReadBufferSize
+				t1.IdleConnTimeout = rt.transportOptions.IdleConnTimeout
 			}
 		}
 
@@ -221,6 +235,7 @@ func (rt *roundTripper) buildHttp1Transport() *http.Transport {
 		t.MaxResponseHeaderBytes = rt.transportOptions.MaxResponseHeaderBytes
 		t.WriteBufferSize = rt.transportOptions.WriteBufferSize
 		t.ReadBufferSize = rt.transportOptions.ReadBufferSize
+		t.IdleConnTimeout = rt.transportOptions.IdleConnTimeout
 	}
 
 	return t