diff --git a/go/go.mod b/go/go.mod
index 21935eb79..95b8add4c 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -1,6 +1,8 @@
 module github.com/ueckoken/chofu-race-course/go
 
-go 1.19
+go 1.21
+
+toolchain go1.23.3
 
 require (
 	github.com/bufbuild/connect-go v1.10.0
@@ -11,7 +13,7 @@ require (
 	github.com/rs/cors v1.11.1
 	github.com/stretchr/testify v1.9.0
 	golang.org/x/net v0.31.0
-	google.golang.org/protobuf v1.34.2
+	google.golang.org/protobuf v1.35.2
 )
 
 require (
diff --git a/go/go.sum b/go/go.sum
index 10b15065d..076c372a3 100644
--- a/go/go.sum
+++ b/go/go.sum
@@ -599,6 +599,8 @@ google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGm
 google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
 google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=