diff --git a/go.mod b/go.mod
index 1b5e2e1d..33adbb2c 100644
--- a/go.mod
+++ b/go.mod
@@ -33,7 +33,7 @@ require (
 	github.com/go-ping/ping v1.1.0
 	github.com/gogo/status v1.1.1
 	github.com/jpillora/backoff v1.0.0
-	github.com/mccutchen/go-httpbin/v2 v2.12.0
+	github.com/mccutchen/go-httpbin/v2 v2.13.1
 	github.com/quasilyte/go-ruleguard/dsl v0.3.22
 	github.com/spf13/afero v1.11.0
 	golang.org/x/exp v0.0.0-20231206192017-f3f8817b8deb
diff --git a/go.sum b/go.sum
index 0f2cde60..97045d43 100644
--- a/go.sum
+++ b/go.sum
@@ -89,8 +89,8 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 h1:jWpvCLoY8Z/e3VKvlsiIGKtc+UG6U5vzxaoagmhXfyg=
 github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0/go.mod h1:QUyp042oQthUoa9bqDv0ER0wrtXnBruoNd7aNjkbP+k=
-github.com/mccutchen/go-httpbin/v2 v2.12.0 h1:MPrFw/Avug0E83SN/j5SYDuD9By0GDAJ9hNTR4RwjyU=
-github.com/mccutchen/go-httpbin/v2 v2.12.0/go.mod h1:f4DUXYlU6yH0V81O4lJIwqpmYdTXXmYwzxMnYEimFPk=
+github.com/mccutchen/go-httpbin/v2 v2.13.1 h1:mDTz2RTD3tugs1BKZM7o6YJsXODYWNvjKZko30B/aWk=
+github.com/mccutchen/go-httpbin/v2 v2.13.1/go.mod h1:f4DUXYlU6yH0V81O4lJIwqpmYdTXXmYwzxMnYEimFPk=
 github.com/miekg/dns v1.1.57 h1:Jzi7ApEIzwEPLHWRcafCN9LZSBbqQpxjt/wpgvg7wcM=
 github.com/miekg/dns v1.1.57/go.mod h1:uqRjCRUuEAA6qsOiJvDd+CFo/vW+y5WR6SNmHE55hZk=
 github.com/mmcloughlin/geohash v0.10.0 h1:9w1HchfDfdeLc+jFEf/04D27KP7E2QmpDu52wPbJWRE=