diff --git a/generators/protoc-gen-go-googlecetypes/go.mod b/generators/protoc-gen-go-googlecetypes/go.mod
index dd1f3eb..399fb8a 100644
--- a/generators/protoc-gen-go-googlecetypes/go.mod
+++ b/generators/protoc-gen-go-googlecetypes/go.mod
@@ -1,5 +1,7 @@
 module github.com/googleapis/google-cloudevents-go/generators/protoc-gen-go-googlecetypes
 
-go 1.20
+go 1.21
 
-require google.golang.org/protobuf v1.34.2
+toolchain go1.21.13
+
+require google.golang.org/protobuf v1.36.2
diff --git a/generators/protoc-gen-go-googlecetypes/go.sum b/generators/protoc-gen-go-googlecetypes/go.sum
index 4e4778a..9a315ed 100644
--- a/generators/protoc-gen-go-googlecetypes/go.sum
+++ b/generators/protoc-gen-go-googlecetypes/go.sum
@@ -4,3 +4,5 @@ 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 v1.36.2 h1:R8FeyR1/eLmkutZOM5CWghmo5itiG9z0ktFlTVLuTmU=
+google.golang.org/protobuf v1.36.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
diff --git a/go.mod b/go.mod
index 80b0dd2..537086f 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,11 @@
 module github.com/googleapis/google-cloudevents-go
 
-go 1.20
+go 1.21
+
+toolchain go1.21.13
 
 require (
 	google.golang.org/genproto v0.0.0-20240805194559-2c9e96a0b5d4
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1
-	google.golang.org/protobuf v1.34.2
+	google.golang.org/protobuf v1.36.2
 )
diff --git a/go.sum b/go.sum
index ca9f6a5..bea1b9f 100644
--- a/go.sum
+++ b/go.sum
@@ -7,3 +7,5 @@ google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 h1:
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
 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 v1.36.2 h1:R8FeyR1/eLmkutZOM5CWghmo5itiG9z0ktFlTVLuTmU=
+google.golang.org/protobuf v1.36.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=