diff --git a/commands/service_platform_search_test.go b/commands/service_platform_search_test.go
index 0e98b28fe59..8fd78e540f8 100644
--- a/commands/service_platform_search_test.go
+++ b/commands/service_platform_search_test.go
@@ -70,7 +70,7 @@ func TestPlatformSearch(t *testing.T) {
 			Releases: map[string]*rpc.PlatformRelease{
 				"1.0.5": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.5",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -79,7 +79,7 @@ func TestPlatformSearch(t *testing.T) {
 				},
 				"1.0.6": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.6",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -110,7 +110,7 @@ func TestPlatformSearch(t *testing.T) {
 			Releases: map[string]*rpc.PlatformRelease{
 				"1.0.5": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.5",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -119,7 +119,7 @@ func TestPlatformSearch(t *testing.T) {
 				},
 				"1.0.6": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.6",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -150,7 +150,7 @@ func TestPlatformSearch(t *testing.T) {
 			Releases: map[string]*rpc.PlatformRelease{
 				"1.0.5": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.5",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -159,7 +159,7 @@ func TestPlatformSearch(t *testing.T) {
 				},
 				"1.0.6": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.6",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -190,7 +190,7 @@ func TestPlatformSearch(t *testing.T) {
 			Releases: map[string]*rpc.PlatformRelease{
 				"1.0.5": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.5",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -199,7 +199,7 @@ func TestPlatformSearch(t *testing.T) {
 				},
 				"1.0.6": {
 					Name:       "RK002",
-					Type:       []string{"Contributed"},
+					Types:      []string{"Contributed"},
 					Installed:  false,
 					Version:    "1.0.6",
 					Boards:     []*rpc.Board{{Name: "RK002"}},
@@ -230,7 +230,7 @@ func TestPlatformSearch(t *testing.T) {
 			Releases: map[string]*rpc.PlatformRelease{
 				"1.8.3": {
 					Name:      "Arduino AVR Boards",
-					Type:      []string{"Arduino"},
+					Types:     []string{"Arduino"},
 					Installed: false,
 					Version:   "1.8.3",
 					Boards: []*rpc.Board{
@@ -288,7 +288,7 @@ func TestPlatformSearch(t *testing.T) {
 			Releases: map[string]*rpc.PlatformRelease{
 				"1.8.3": {
 					Name:      "Arduino AVR Boards",
-					Type:      []string{"Arduino"},
+					Types:     []string{"Arduino"},
 					Installed: false,
 					Version:   "1.8.3",
 					Boards: []*rpc.Board{
diff --git a/commands/utility_core.go b/commands/utility_core.go
index b5a57ad509d..32f32709d46 100644
--- a/commands/utility_core.go
+++ b/commands/utility_core.go
@@ -72,7 +72,7 @@ func platformReleaseToRPC(platformRelease *cores.PlatformRelease) *rpc.PlatformR
 		Version:         platformRelease.Version.String(),
 		Installed:       platformRelease.IsInstalled(),
 		MissingMetadata: missingMetadata,
-		Type:            []string{platformRelease.Category},
+		Types:           []string{platformRelease.Category},
 		Deprecated:      platformRelease.Deprecated,
 		Compatible:      platformRelease.IsCompatible(),
 	}
diff --git a/docs/UPGRADING.md b/docs/UPGRADING.md
index b41ecd30076..8d57833900c 100644
--- a/docs/UPGRADING.md
+++ b/docs/UPGRADING.md
@@ -181,6 +181,42 @@ func main() {
 
 The `yaml` option of the `--format` flag is no more supported. Use `--format json` if machine parsable output is needed.
 
+### gRPC: The `type` field has been renamed to `types` in the `cc.arduino.cli.commands.v1.PlatformRelease` message.
+
+Rebuilding the gRPC bindings from the proto files requires to rename all access to `type` field as `types`.
+
+By the way, the wire protocol is not affected by this change, existing clients should work fine without modification.
+
+### The `type` field has been renamed to `types` in the JSON output including a platform release.
+
+Since the `type` field may contain multiple values has been renamed to `types` to better express this aspect.
+
+Previously:
+
+```
+$ arduino-cli core list --json | jq '.platforms[4].releases."1.8.13"'
+{
+  "name": "Arduino SAMD (32-bits ARM Cortex-M0+) Boards",
+  "version": "1.8.13",
+  "type": [
+    "Arduino"
+  ],
+  ...
+```
+
+Now:
+
+```
+$ arduino-cli core list --json | jq '.platforms[4].releases."1.8.13"'
+{
+  "name": "Arduino SAMD (32-bits ARM Cortex-M0+) Boards",
+  "version": "1.8.13",
+  "types": [
+    "Arduino"
+  ],
+  ...
+```
+
 ### The gRPC `cc.arduino.cli.commands.v1.CompileRequest.export_binaries` changed type.
 
 Previously the field `export_binaries` was a `google.protobuf.BoolValue`. We used this type because it expresses this
diff --git a/internal/cli/feedback/result/rpc.go b/internal/cli/feedback/result/rpc.go
index f5178a6382c..a1b464a89b1 100644
--- a/internal/cli/feedback/result/rpc.go
+++ b/internal/cli/feedback/result/rpc.go
@@ -117,7 +117,7 @@ func NewPlatformRelease(in *rpc.PlatformRelease) *PlatformRelease {
 	res := &PlatformRelease{
 		Name:            in.GetName(),
 		Version:         in.GetVersion(),
-		Type:            in.GetType(),
+		Types:           in.GetTypes(),
 		Installed:       in.GetInstalled(),
 		Boards:          boards,
 		Help:            help,
@@ -132,7 +132,7 @@ func NewPlatformRelease(in *rpc.PlatformRelease) *PlatformRelease {
 type PlatformRelease struct {
 	Name            string        `json:"name,omitempty"`
 	Version         string        `json:"version,omitempty"`
-	Type            []string      `json:"type,omitempty"`
+	Types           []string      `json:"types,omitempty"`
 	Installed       bool          `json:"installed,omitempty"`
 	Boards          []*Board      `json:"boards,omitempty"`
 	Help            *HelpResource `json:"help,omitempty"`
diff --git a/rpc/cc/arduino/cli/commands/v1/common.pb.go b/rpc/cc/arduino/cli/commands/v1/common.pb.go
index 97093536331..e11f43b7f0e 100644
--- a/rpc/cc/arduino/cli/commands/v1/common.pb.go
+++ b/rpc/cc/arduino/cli/commands/v1/common.pb.go
@@ -785,7 +785,7 @@ type PlatformRelease struct {
 	// Version of the platform release
 	Version string `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
 	// Type of the platform.
-	Type []string `protobuf:"bytes,3,rep,name=type,proto3" json:"type,omitempty"`
+	Types []string `protobuf:"bytes,3,rep,name=types,proto3" json:"types,omitempty"`
 	// True if the platform is installed
 	Installed bool `protobuf:"varint,4,opt,name=installed,proto3" json:"installed,omitempty"`
 	// List of boards provided by the platform. If the platform is installed,
@@ -856,9 +856,9 @@ func (x *PlatformRelease) GetVersion() string {
 	return ""
 }
 
-func (x *PlatformRelease) GetType() []string {
+func (x *PlatformRelease) GetTypes() []string {
 	if x != nil {
-		return x.Type
+		return x.Types
 	}
 	return nil
 }
@@ -1392,86 +1392,86 @@ var file_cc_arduino_cli_commands_v1_common_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/rpc/cc/arduino/cli/commands/v1/common.proto b/rpc/cc/arduino/cli/commands/v1/common.proto
index f25f8a92cdf..1c92e0f2a21 100644
--- a/rpc/cc/arduino/cli/commands/v1/common.proto
+++ b/rpc/cc/arduino/cli/commands/v1/common.proto
@@ -129,7 +129,7 @@ message PlatformRelease {
   // Version of the platform release
   string version = 2;
   // Type of the platform.
-  repeated string type = 3;
+  repeated string types = 3;
   // True if the platform is installed
   bool installed = 4;
   // List of boards provided by the platform. If the platform is installed,