diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 611fda9..6060120 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -24,6 +24,7 @@ variables:
       --destination "${IMAGE_NAME}:${CI_COMMIT_SHA}"
       --destination "${IMAGE_NAME}:latest"
       --cache=true
+      --registry-mirror=dockerhub.timeweb.cloud
 
 build_frontend:
   <<: *build-template
@@ -74,9 +75,12 @@ deploy:
     - ssh $SSH_ADDRESS "$AUTH_COMMAND"
     - scp -C -r infrastructure/ compose.yaml $SSH_ADDRESS:~/deploy/
     - ssh $SSH_ADDRESS "docker -v"
-    - ssh $SSH_ADDRESS "cd ~/deploy && \
-      docker compose pull > deploy.log 2>&1 && \
-      docker compose down >> deploy.log 2>&1 && \
-      docker compose up -d --remove-orphans >> deploy.log 2>&1 && \
-      docker compose ps >> deploy.log 2>&1"
-    - ssh $SSH_ADDRESS "docker system prune -a"
+    - |
+      ssh $SSH_ADDRESS <<'EOF'
+      cd ~/deploy
+      docker compose pull > deploy.log 2>&1
+      docker compose down >> deploy.log 2>&1
+      docker compose up -d --remove-orphans >> deploy.log 2>&1
+      docker compose ps >> deploy.log 2>&1
+      EOF
+    - ssh $SSH_ADDRESS "docker system prune -a --force"
diff --git a/services/backend/api/v1/competition/schemas.py b/services/backend/api/v1/competition/schemas.py
index 1c5aff1..079baab 100644
--- a/services/backend/api/v1/competition/schemas.py
+++ b/services/backend/api/v1/competition/schemas.py
@@ -11,7 +11,7 @@ class CompetitionOut(ModelSchema):
 
     class Meta:
         model = Competition
-        fields = "__all__"
+        exclude = ("participants",)
 
 
 class StateOut(ModelSchema):