diff --git a/go.mod b/go.mod
index 77ad417..d2b8c40 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	golang.org/x/sync v0.7.0
 )
 
-require github.com/creachadair/mds v0.15.2
+require github.com/creachadair/mds v0.15.5
 
 go 1.21
 
diff --git a/go.sum b/go.sum
index d9d4697..30381d3 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/creachadair/mds v0.15.2 h1:es1qGKgRGSaztpvrSQcZ0B9I6NsHYJ1Sa9naD/3OfCM=
-github.com/creachadair/mds v0.15.2/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
+github.com/creachadair/mds v0.15.5 h1:dhCbq/OzF4LiVkmmfy6Wm47w60CBF9iLU1J26ruCaE4=
+github.com/creachadair/mds v0.15.5/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
 github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
diff --git a/tools/go.mod b/tools/go.mod
index 0f864dc..d3b0299 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -10,7 +10,7 @@ require (
 )
 
 require (
-	github.com/creachadair/mds v0.15.2 // indirect
+	github.com/creachadair/mds v0.15.5 // indirect
 	golang.org/x/sync v0.7.0 // indirect
 	nhooyr.io/websocket v1.8.11 // indirect
 )
diff --git a/tools/go.sum b/tools/go.sum
index 5d606f6..892530e 100644
--- a/tools/go.sum
+++ b/tools/go.sum
@@ -1,7 +1,7 @@
 github.com/creachadair/jrpc2 v1.2.0 h1:SXr0OgnwM0X18P+HccJP0uT3KGSDk/BCSRlJBvE2bMY=
 github.com/creachadair/jrpc2 v1.2.0/go.mod h1:66uKSdr6tR5ZeNvkIjDSbbVUtOv0UhjS/vcd8ECP7Iw=
-github.com/creachadair/mds v0.15.2 h1:es1qGKgRGSaztpvrSQcZ0B9I6NsHYJ1Sa9naD/3OfCM=
-github.com/creachadair/mds v0.15.2/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
+github.com/creachadair/mds v0.15.5 h1:dhCbq/OzF4LiVkmmfy6Wm47w60CBF9iLU1J26ruCaE4=
+github.com/creachadair/mds v0.15.5/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
 github.com/creachadair/wschannel v0.0.0-20240419143920-8a0c643c57cc h1:qum791hcmLtoBv26ID7y/Z8ZhooVHgsRwE+GQhfo5Ks=
 github.com/creachadair/wschannel v0.0.0-20240419143920-8a0c643c57cc/go.mod h1:4v2wftOqKNLbhuuZocaXeLehdf9rmvNJtUkenv0AYZw=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=