diff --git a/go.mod b/go.mod
index 34331e0..49da446 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/int128/oauth2cli
 
 go 1.24.0
 
-toolchain go1.25.5
+toolchain go1.25.6
 
 require (
 	github.com/google/go-cmp v0.7.0
diff --git a/tools/go.mod b/tools/go.mod
index 38f6991..4b2dc13 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -1,6 +1,6 @@
 module github.com/int128/oauth2cli/tools
 
-go 1.25.5
+go 1.25.6
 
 tool github.com/golangci/golangci-lint/v2/cmd/golangci-lint