diff --git a/crypto/keyspb/keyspb.pb.go b/crypto/keyspb/keyspb.pb.go
index 793c16a822..10f2d62a55 100644
--- a/crypto/keyspb/keyspb.pb.go
+++ b/crypto/keyspb/keyspb.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: crypto/keyspb/keyspb.proto
 
diff --git a/go.mod b/go.mod
index d293b3397e..703d181563 100644
--- a/go.mod
+++ b/go.mod
@@ -37,5 +37,5 @@ require (
 	google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6
 	google.golang.org/grpc v1.45.0
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.2.0
-	google.golang.org/protobuf v1.27.1
+	google.golang.org/protobuf v1.28.0
 )
diff --git a/go.sum b/go.sum
index e06b5c3301..fe9f2b56d0 100644
--- a/go.sum
+++ b/go.sum
@@ -1440,8 +1440,9 @@ google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlba
 google.golang.org/protobuf v1.25.1-0.20200805231151-a709e31e5d12/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
+google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/quota/etcd/quotapb/quotapb.pb.go b/quota/etcd/quotapb/quotapb.pb.go
index 53ac673ad8..b75b203ede 100644
--- a/quota/etcd/quotapb/quotapb.pb.go
+++ b/quota/etcd/quotapb/quotapb.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: quotapb.proto
 
diff --git a/quota/etcd/storagepb/storagepb.pb.go b/quota/etcd/storagepb/storagepb.pb.go
index 349b527719..56be2861d8 100644
--- a/quota/etcd/storagepb/storagepb.pb.go
+++ b/quota/etcd/storagepb/storagepb.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: storagepb.proto
 
diff --git a/storage/cloudspanner/spannerpb/spanner.pb.go b/storage/cloudspanner/spannerpb/spanner.pb.go
index e8d2a39151..04a2130d98 100644
--- a/storage/cloudspanner/spannerpb/spanner.pb.go
+++ b/storage/cloudspanner/spannerpb/spanner.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: spanner.proto
 
diff --git a/storage/storagepb/storage.pb.go b/storage/storagepb/storage.pb.go
index 69408e23d7..292ac18bda 100644
--- a/storage/storagepb/storage.pb.go
+++ b/storage/storagepb/storage.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: storage.proto
 
diff --git a/trillian.pb.go b/trillian.pb.go
index 50d58e099f..28a40f549e 100644
--- a/trillian.pb.go
+++ b/trillian.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: trillian.proto
 
diff --git a/trillian_admin_api.pb.go b/trillian_admin_api.pb.go
index 1aff3a4ec6..6d58920385 100644
--- a/trillian_admin_api.pb.go
+++ b/trillian_admin_api.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: trillian_admin_api.proto
 
diff --git a/trillian_log_api.pb.go b/trillian_log_api.pb.go
index 891e616892..ca1ef53385 100644
--- a/trillian_log_api.pb.go
+++ b/trillian_log_api.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
+// 	protoc-gen-go v1.28.0
 // 	protoc        v3.12.4
 // source: trillian_log_api.proto