diff --git a/go.mod b/go.mod
index 69c5d63..40c2a3a 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,6 @@ module github.com/mna/pigeon
 
 go 1.20
 
-require golang.org/x/tools v0.20.0
+require golang.org/x/tools v0.21.0
 
 require golang.org/x/mod v0.17.0 // indirect
diff --git a/go.sum b/go.sum
index cc0bd8a..3c47213 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
 golang.org/x/mod v0.17.0 h1:zY54UmvipHiNd+pm+m0x9KhZ9hl1/7QNMyxXbc6ICqA=
 golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
-golang.org/x/tools v0.20.0 h1:hz/CVckiOxybQvFw6h7b/q80NTr9IUQb4s1IIzW7KNY=
-golang.org/x/tools v0.20.0/go.mod h1:WvitBU7JJf6A4jOdg4S1tviW9bhUxkgeCui/0JHctQg=
+golang.org/x/tools v0.21.0 h1:qc0xYgIbsSDt9EyWz05J5wfa7LOVW0YTLOXrqdLAWIw=
+golang.org/x/tools v0.21.0/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=