diff --git a/pkg/messaging/message.pb.go b/pkg/messaging/message.pb.go
index 64c36b42..aadd1a50 100644
--- a/pkg/messaging/message.pb.go
+++ b/pkg/messaging/message.pb.go
@@ -3,8 +3,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        v3.21.12
+// 	protoc-gen-go v1.31.0
+// 	protoc        v4.23.3
 // source: pkg/messaging/message.proto
 
 package messaging
diff --git a/scripts/ci.sh b/scripts/ci.sh
index 3933691a..6b03905c 100755
--- a/scripts/ci.sh
+++ b/scripts/ci.sh
@@ -1,9 +1,9 @@
 # This script contains commands to be executed by the CI tool.
 NPROC=$(nproc)
 GO_VERSION=1.19.4
-PROTOC_VERSION=21.12
-PROTOC_GEN_VERSION=v1.28.1
-PROTOC_GRPC_VERSION=v1.2.0
+PROTOC_VERSION=23.3
+PROTOC_GEN_VERSION=v1.31.0
+PROTOC_GRPC_VERSION=v1.3.0
 GOLANGCI_LINT_VERSION=v1.52.1
 
 function version_gt() { test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1"; }
@@ -36,7 +36,7 @@ setup_protoc() {
     unzip -o $PROTOC_ZIP -d protoc3
     sudo mv protoc3/bin/* /usr/local/bin/
     sudo mv protoc3/include/* /usr/local/include/
-    rm -f PROTOC_ZIP
+    rm -rf $PROTOC_ZIP protoc3
 
     go install google.golang.org/protobuf/cmd/protoc-gen-go@$PROTOC_GEN_VERSION
     go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@$PROTOC_GRPC_VERSION
diff --git a/things/policies/auth.pb.go b/things/policies/auth.pb.go
index de58e76e..0c744a15 100644
--- a/things/policies/auth.pb.go
+++ b/things/policies/auth.pb.go
@@ -3,8 +3,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        v3.21.12
+// 	protoc-gen-go v1.31.0
+// 	protoc        v4.23.3
 // source: things/policies/auth.proto
 
 package policies
diff --git a/things/policies/auth_grpc.pb.go b/things/policies/auth_grpc.pb.go
index a374bea8..0d62bb6a 100644
--- a/things/policies/auth_grpc.pb.go
+++ b/things/policies/auth_grpc.pb.go
@@ -1,7 +1,10 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.21.12
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.3
 // source: things/policies/auth.proto
 
 package policies
@@ -18,6 +21,11 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	ThingsService_Authorize_FullMethodName = "/mainflux.things.policies.ThingsService/Authorize"
+	ThingsService_Identify_FullMethodName  = "/mainflux.things.policies.ThingsService/Identify"
+)
+
 // ThingsServiceClient is the client API for ThingsService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -36,7 +44,7 @@ func NewThingsServiceClient(cc grpc.ClientConnInterface) ThingsServiceClient {
 
 func (c *thingsServiceClient) Authorize(ctx context.Context, in *AuthorizeReq, opts ...grpc.CallOption) (*AuthorizeRes, error) {
 	out := new(AuthorizeRes)
-	err := c.cc.Invoke(ctx, "/mainflux.things.policies.ThingsService/Authorize", in, out, opts...)
+	err := c.cc.Invoke(ctx, ThingsService_Authorize_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -45,7 +53,7 @@ func (c *thingsServiceClient) Authorize(ctx context.Context, in *AuthorizeReq, o
 
 func (c *thingsServiceClient) Identify(ctx context.Context, in *Key, opts ...grpc.CallOption) (*ClientID, error) {
 	out := new(ClientID)
-	err := c.cc.Invoke(ctx, "/mainflux.things.policies.ThingsService/Identify", in, out, opts...)
+	err := c.cc.Invoke(ctx, ThingsService_Identify_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -94,7 +102,7 @@ func _ThingsService_Authorize_Handler(srv interface{}, ctx context.Context, dec
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.things.policies.ThingsService/Authorize",
+		FullMethod: ThingsService_Authorize_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(ThingsServiceServer).Authorize(ctx, req.(*AuthorizeReq))
@@ -112,7 +120,7 @@ func _ThingsService_Identify_Handler(srv interface{}, ctx context.Context, dec f
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.things.policies.ThingsService/Identify",
+		FullMethod: ThingsService_Identify_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(ThingsServiceServer).Identify(ctx, req.(*Key))
diff --git a/users/policies/auth.pb.go b/users/policies/auth.pb.go
index 22c99470..a2b3e879 100644
--- a/users/policies/auth.pb.go
+++ b/users/policies/auth.pb.go
@@ -3,8 +3,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        v3.21.12
+// 	protoc-gen-go v1.31.0
+// 	protoc        v4.23.3
 // source: users/policies/auth.proto
 
 package policies
diff --git a/users/policies/auth_grpc.pb.go b/users/policies/auth_grpc.pb.go
index af14230b..6ed001f6 100644
--- a/users/policies/auth_grpc.pb.go
+++ b/users/policies/auth_grpc.pb.go
@@ -1,7 +1,10 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.21.12
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.3
 // source: users/policies/auth.proto
 
 package policies
@@ -18,6 +21,15 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	AuthService_Authorize_FullMethodName    = "/mainflux.users.policies.AuthService/Authorize"
+	AuthService_Issue_FullMethodName        = "/mainflux.users.policies.AuthService/Issue"
+	AuthService_Identify_FullMethodName     = "/mainflux.users.policies.AuthService/Identify"
+	AuthService_AddPolicy_FullMethodName    = "/mainflux.users.policies.AuthService/AddPolicy"
+	AuthService_DeletePolicy_FullMethodName = "/mainflux.users.policies.AuthService/DeletePolicy"
+	AuthService_ListPolicies_FullMethodName = "/mainflux.users.policies.AuthService/ListPolicies"
+)
+
 // AuthServiceClient is the client API for AuthService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -40,7 +52,7 @@ func NewAuthServiceClient(cc grpc.ClientConnInterface) AuthServiceClient {
 
 func (c *authServiceClient) Authorize(ctx context.Context, in *AuthorizeReq, opts ...grpc.CallOption) (*AuthorizeRes, error) {
 	out := new(AuthorizeRes)
-	err := c.cc.Invoke(ctx, "/mainflux.users.policies.AuthService/Authorize", in, out, opts...)
+	err := c.cc.Invoke(ctx, AuthService_Authorize_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -49,7 +61,7 @@ func (c *authServiceClient) Authorize(ctx context.Context, in *AuthorizeReq, opt
 
 func (c *authServiceClient) Issue(ctx context.Context, in *IssueReq, opts ...grpc.CallOption) (*Token, error) {
 	out := new(Token)
-	err := c.cc.Invoke(ctx, "/mainflux.users.policies.AuthService/Issue", in, out, opts...)
+	err := c.cc.Invoke(ctx, AuthService_Issue_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -58,7 +70,7 @@ func (c *authServiceClient) Issue(ctx context.Context, in *IssueReq, opts ...grp
 
 func (c *authServiceClient) Identify(ctx context.Context, in *Token, opts ...grpc.CallOption) (*UserIdentity, error) {
 	out := new(UserIdentity)
-	err := c.cc.Invoke(ctx, "/mainflux.users.policies.AuthService/Identify", in, out, opts...)
+	err := c.cc.Invoke(ctx, AuthService_Identify_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -67,7 +79,7 @@ func (c *authServiceClient) Identify(ctx context.Context, in *Token, opts ...grp
 
 func (c *authServiceClient) AddPolicy(ctx context.Context, in *AddPolicyReq, opts ...grpc.CallOption) (*AddPolicyRes, error) {
 	out := new(AddPolicyRes)
-	err := c.cc.Invoke(ctx, "/mainflux.users.policies.AuthService/AddPolicy", in, out, opts...)
+	err := c.cc.Invoke(ctx, AuthService_AddPolicy_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -76,7 +88,7 @@ func (c *authServiceClient) AddPolicy(ctx context.Context, in *AddPolicyReq, opt
 
 func (c *authServiceClient) DeletePolicy(ctx context.Context, in *DeletePolicyReq, opts ...grpc.CallOption) (*DeletePolicyRes, error) {
 	out := new(DeletePolicyRes)
-	err := c.cc.Invoke(ctx, "/mainflux.users.policies.AuthService/DeletePolicy", in, out, opts...)
+	err := c.cc.Invoke(ctx, AuthService_DeletePolicy_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -85,7 +97,7 @@ func (c *authServiceClient) DeletePolicy(ctx context.Context, in *DeletePolicyRe
 
 func (c *authServiceClient) ListPolicies(ctx context.Context, in *ListPoliciesReq, opts ...grpc.CallOption) (*ListPoliciesRes, error) {
 	out := new(ListPoliciesRes)
-	err := c.cc.Invoke(ctx, "/mainflux.users.policies.AuthService/ListPolicies", in, out, opts...)
+	err := c.cc.Invoke(ctx, AuthService_ListPolicies_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -150,7 +162,7 @@ func _AuthService_Authorize_Handler(srv interface{}, ctx context.Context, dec fu
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.users.policies.AuthService/Authorize",
+		FullMethod: AuthService_Authorize_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(AuthServiceServer).Authorize(ctx, req.(*AuthorizeReq))
@@ -168,7 +180,7 @@ func _AuthService_Issue_Handler(srv interface{}, ctx context.Context, dec func(i
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.users.policies.AuthService/Issue",
+		FullMethod: AuthService_Issue_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(AuthServiceServer).Issue(ctx, req.(*IssueReq))
@@ -186,7 +198,7 @@ func _AuthService_Identify_Handler(srv interface{}, ctx context.Context, dec fun
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.users.policies.AuthService/Identify",
+		FullMethod: AuthService_Identify_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(AuthServiceServer).Identify(ctx, req.(*Token))
@@ -204,7 +216,7 @@ func _AuthService_AddPolicy_Handler(srv interface{}, ctx context.Context, dec fu
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.users.policies.AuthService/AddPolicy",
+		FullMethod: AuthService_AddPolicy_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(AuthServiceServer).AddPolicy(ctx, req.(*AddPolicyReq))
@@ -222,7 +234,7 @@ func _AuthService_DeletePolicy_Handler(srv interface{}, ctx context.Context, dec
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.users.policies.AuthService/DeletePolicy",
+		FullMethod: AuthService_DeletePolicy_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(AuthServiceServer).DeletePolicy(ctx, req.(*DeletePolicyReq))
@@ -240,7 +252,7 @@ func _AuthService_ListPolicies_Handler(srv interface{}, ctx context.Context, dec
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/mainflux.users.policies.AuthService/ListPolicies",
+		FullMethod: AuthService_ListPolicies_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(AuthServiceServer).ListPolicies(ctx, req.(*ListPoliciesReq))