diff --git a/go.mod b/go.mod
index f01c384b..6411b3b0 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module cloud.google.com/go/cloudsqlconn
 
 go 1.24.0
 
-toolchain go1.25.3
+toolchain go1.25.5
 
 require (
 	cloud.google.com/go/auth v0.17.0