diff --git a/go.mod b/go.mod
index aa6dbbe..81229a2 100644
--- a/go.mod
+++ b/go.mod
@@ -3,10 +3,10 @@ module github.com/creachadair/jrpc2
 require (
 	github.com/fortytw2/leaktest v1.3.0
 	github.com/google/go-cmp v0.6.0
-	golang.org/x/sync v0.5.0
+	golang.org/x/sync v0.6.0
 )
 
-require github.com/creachadair/mds v0.5.1
+require github.com/creachadair/mds v0.7.0
 
 go 1.21
 
diff --git a/go.sum b/go.sum
index 878f871..3a0ac02 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,8 @@
-github.com/creachadair/mds v0.5.1 h1:x0CzsB0SGxrgWdRFPcBd6UnNxu5Azpc1/Beh5hgK2mo=
-github.com/creachadair/mds v0.5.1/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
+github.com/creachadair/mds v0.7.0 h1:7QoYqiPl18C0h7CLq9z9/qUH5Vr62V9677yJZHGLoQM=
+github.com/creachadair/mds v0.7.0/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=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
-golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
diff --git a/tools/go.mod b/tools/go.mod
index 5700da3..3381492 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -10,7 +10,7 @@ require (
 )
 
 require (
-	github.com/creachadair/mds v0.5.1 // indirect
-	golang.org/x/sync v0.5.0 // indirect
+	github.com/creachadair/mds v0.7.0 // indirect
+	golang.org/x/sync v0.6.0 // indirect
 	nhooyr.io/websocket v1.8.10 // indirect
 )
diff --git a/tools/go.sum b/tools/go.sum
index e639a32..ef8fec0 100644
--- a/tools/go.sum
+++ b/tools/go.sum
@@ -1,14 +1,14 @@
 github.com/creachadair/jrpc2 v1.1.2 h1:UOYMipEFYlwd5qmcvs9GZBurn3oXt1UDIX5JLjWWFzo=
 github.com/creachadair/jrpc2 v1.1.2/go.mod h1:JcCe2Eny3lIvVwZLm92WXyU+tNUgTBWFCLMsfNkjEGk=
-github.com/creachadair/mds v0.5.1 h1:x0CzsB0SGxrgWdRFPcBd6UnNxu5Azpc1/Beh5hgK2mo=
-github.com/creachadair/mds v0.5.1/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
+github.com/creachadair/mds v0.7.0 h1:7QoYqiPl18C0h7CLq9z9/qUH5Vr62V9677yJZHGLoQM=
+github.com/creachadair/mds v0.7.0/go.mod h1:4vrFYUzTXMJpMBU+OA292I6IUxKWCCfZkgXg+/kBZMo=
 github.com/creachadair/wschannel v0.0.0-20231211041550-f82e9bbfc258 h1:ylCT9u85Nxnsv6nSeye9CTWRtrzUm/nuwUMoVgW/VCw=
 github.com/creachadair/wschannel v0.0.0-20231211041550-f82e9bbfc258/go.mod h1:G2LDwAuE2B2YbCxMaxnB1qSC0Hzoy2Tf9eRel2qbRi8=
 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=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
-golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 nhooyr.io/websocket v1.8.10 h1:mv4p+MnGrLDcPlBoWsvPP7XCzTYMXP9F9eIGoKbgx7Q=
 nhooyr.io/websocket v1.8.10/go.mod h1:rN9OFWIUwuxg4fR5tELlYC04bXYowCP9GX47ivo2l+c=