diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index 7c74fb66..4ca1ebe5 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -26,6 +26,10 @@ jobs:
         run: yarn install
         working-directory: "front"
 
+      - name: "Install messages dependencies"
+        run: yarn install
+        working-directory: "messages"
+
       - name: "Build"
         run: yarn run build
         env:
@@ -58,6 +62,10 @@ jobs:
         run: yarn install
         working-directory: "back"
 
+      - name: "Install messages dependencies"
+        run: yarn install
+        working-directory: "messages"
+
       - name: "Build"
         run: yarn run tsc
         working-directory: "back"
diff --git a/messages/messages.proto b/messages/messages.proto
index 7d8cb0a8..9cf6de8a 100644
--- a/messages/messages.proto
+++ b/messages/messages.proto
@@ -15,6 +15,11 @@ message PositionMessage {
   bool moving = 4;
 }
 
+message PointMessage {
+  int32 x = 1;
+  int32 y = 2;
+}
+
 message ViewportMessage {
   int32 left = 1;
   int32 top = 2;
@@ -52,3 +57,12 @@ message BatchMessage {
   string event = 1;
   repeated SubMessage payload = 2;
 }
+
+message GroupUpdateMessage {
+  int32 groupId = 1;
+  PointMessage position = 2;
+}
+
+message GroupDeleteMessage {
+  int32 groupId = 1;
+}