diff --git a/go.mod b/go.mod
index 59b2a6488..ac45b4f44 100644
--- a/go.mod
+++ b/go.mod
@@ -24,7 +24,7 @@ require (
 	golang.org/x/crypto v0.14.0
 	golang.org/x/net v0.17.0
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1
-	google.golang.org/grpc v1.54.0
+	google.golang.org/grpc v1.56.3
 	google.golang.org/protobuf v1.30.0
 	gopkg.in/yaml.v2 v2.4.0
 )
diff --git a/go.sum b/go.sum
index c43110251..260300617 100644
--- a/go.sum
+++ b/go.sum
@@ -657,8 +657,8 @@ google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
 google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.54.0 h1:EhTqbhiYeixwWQtAEZAxmV9MGqcjEU2mFx52xCzNyag=
-google.golang.org/grpc v1.54.0/go.mod h1:PUSEXI6iWghWaB6lXM4knEgpJNu2qUcKfDtNci3EC2g=
+google.golang.org/grpc v1.56.3 h1:8I4C0Yq1EjstUzUJzpcRVbuYA2mODtEmpWiQoN/b2nc=
+google.golang.org/grpc v1.56.3/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
diff --git a/server/rpc/grpchelper/status.go b/server/rpc/grpchelper/status.go
index a75a8a1b3..723f2a49d 100644
--- a/server/rpc/grpchelper/status.go
+++ b/server/rpc/grpchelper/status.go
@@ -59,6 +59,7 @@ var errorToCode = map[error]codes.Code{
 	// AlreadyExists means the requested resource already exists.
 	database.ErrProjectAlreadyExists:     codes.AlreadyExists,
 	database.ErrProjectNameAlreadyExists: codes.AlreadyExists,
+	database.ErrUserAlreadyExists:        codes.AlreadyExists,
 
 	// FailedPrecondition means the request is rejected because the state of the
 	// system is not the desired state.
diff --git a/server/rpc/server_test.go b/server/rpc/server_test.go
index faad247e8..b52e60f5f 100644
--- a/server/rpc/server_test.go
+++ b/server/rpc/server_test.go
@@ -718,7 +718,7 @@ func TestAdminRPCServerBackend(t *testing.T) {
 				Password: adminPassword,
 			},
 		)
-		assert.Equal(t, codes.Unknown, status.Convert(err).Code())
+		assert.Equal(t, codes.AlreadyExists, status.Convert(err).Code())
 	})
 
 	t.Run("admin login test", func(t *testing.T) {