diff --git a/tools/go.mod b/tools/go.mod
index bf851e386..8f036e311 100644
--- a/tools/go.mod
+++ b/tools/go.mod
@@ -9,4 +9,4 @@ require (
 	golang.org/x/tools v0.12.1-0.20230815132531-74c255bcf846 // indirect
 )
 
-go 1.20
+go 1.21
diff --git a/tools/go.sum b/tools/go.sum
index ce16f0521..697c65f1b 100644
--- a/tools/go.sum
+++ b/tools/go.sum
@@ -1,6 +1,9 @@
 github.com/google/go-cmdtest v0.4.1-0.20220921163831-55ab3332a786 h1:rcv+Ippz6RAtvaGgKxc+8FQIpxHgsF+HBzPyYL2cyVU=
+github.com/google/go-cmdtest v0.4.1-0.20220921163831-55ab3332a786/go.mod h1:apVn/GCasLZUVpAJ6oWAuyP7Ne7CEsQbTnc0plM3m+o=
 github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
+github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/renameio v0.1.0 h1:GOZbcHa3HfsPKPlmyPyN2KEohoMXOhdMbHrvbpl2QaA=
+github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 golang.org/x/mod v0.12.0 h1:rmsUpXtvNzj340zd98LZ4KntptpfRHwpFOHG188oHXc=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
diff --git a/zapgrpc/internal/test/go.mod b/zapgrpc/internal/test/go.mod
index 011bbede3..ea95417f7 100644
--- a/zapgrpc/internal/test/go.mod
+++ b/zapgrpc/internal/test/go.mod
@@ -1,6 +1,6 @@
 module go.uber.org/zap/zapgrpc/internal/test
 
-go 1.17
+go 1.21
 
 require (
 	github.com/stretchr/testify v1.8.1