diff --git a/tools/go.mod b/tools/go.mod
index fff737c..160718e 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -2,6 +2,6 @@ module go.abhg.dev/goldmark/mermaid/tools
 
 go 1.19
 
-require golang.org/x/tools v0.18.0
+require golang.org/x/tools v0.19.0
 
-require golang.org/x/mod v0.15.0 // indirect
+require golang.org/x/mod v0.16.0 // indirect
diff --git a/tools/go.sum b/tools/go.sum
index 0c8cfcf..99fac8c 100644
--- a/tools/go.sum
+++ b/tools/go.sum
@@ -1,5 +1,5 @@
-golang.org/x/mod v0.15.0 h1:SernR4v+D55NyBH2QiEQrlBAnj1ECL6AGrA5+dPaMY8=
-golang.org/x/mod v0.15.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.16.0 h1:QX4fJ0Rr5cPQCF7O9lh9Se4pmwfwskqZfq5moyldzic=
+golang.org/x/mod v0.16.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
-golang.org/x/tools v0.18.0 h1:k8NLag8AGHnn+PHbl7g43CtqZAwG60vZkLqgyZgIHgQ=
-golang.org/x/tools v0.18.0/go.mod h1:GL7B4CwcLLeo59yx/9UWWuNOW1n3VZ4f5axWfML7Lcg=
+golang.org/x/tools v0.19.0 h1:tfGCXNR1OsFG+sVdLAitlpjAvD/I6dHDKnYrpEZUHkw=
+golang.org/x/tools v0.19.0/go.mod h1:qoJWxmGSIBmAeriMx19ogtrEPrGtDbPK634QFIcLAhc=