diff --git a/deploy/anal-front/deploy.sh b/deploy/anal-front/deploy.sh
index c2db4e1..36f0bef 100755
--- a/deploy/anal-front/deploy.sh
+++ b/deploy/anal-front/deploy.sh
@@ -6,6 +6,7 @@ COMPOSE_FILE="${COMPOSE_FILE:-$APP_DIR/compose.yml}"
 ENV_FILE="${ENV_FILE:-$APP_DIR/.env}"
 IMAGE_ENV_FILE="${IMAGE_ENV_FILE:-$APP_DIR/releases/current.env}"
 HEALTH_URL="${HEALTH_URL:-http://10.10.0.124:18011/}"
+DEFAULT_BACKEND_UPSTREAM="${DEFAULT_BACKEND_UPSTREAM:-http://10.10.0.124:18010}"
 ANAL_FRONT_WEB_IMAGE="${1:-${ANAL_FRONT_WEB_IMAGE:-}}"
 
 if [[ -z "$ANAL_FRONT_WEB_IMAGE" ]]; then
@@ -18,11 +19,38 @@ install -d -m 0770 "$APP_DIR" "$APP_DIR/releases"
 if [[ ! -f "$ENV_FILE" ]]; then
   umask 077
   cat >"$ENV_FILE" <<EOF
-BACKEND_UPSTREAM=https://anal-back.dev.nii-ecos.ru
+BACKEND_UPSTREAM=$DEFAULT_BACKEND_UPSTREAM
 FRONTEND_BIND_HOST=10.10.0.124
 FRONTEND_PORT=18011
 EOF
   chmod 0600 "$ENV_FILE"
+else
+  umask 077
+  current_backend_upstream="$(
+    awk -F= '/^BACKEND_UPSTREAM=/{sub(/^BACKEND_UPSTREAM=/, ""); print; exit}' "$ENV_FILE"
+  )"
+  desired_backend_upstream="$current_backend_upstream"
+  if [[ -z "$desired_backend_upstream" || "$desired_backend_upstream" == "https://anal-back.dev.nii-ecos.ru" ]]; then
+    desired_backend_upstream="$DEFAULT_BACKEND_UPSTREAM"
+  fi
+
+  tmp_env_file="$(mktemp)"
+  backend_line_written=0
+  while IFS= read -r line || [[ -n "$line" ]]; do
+    if [[ "$line" == BACKEND_UPSTREAM=* ]]; then
+      printf 'BACKEND_UPSTREAM=%s\n' "$desired_backend_upstream" >>"$tmp_env_file"
+      backend_line_written=1
+      continue
+    fi
+    printf '%s\n' "$line" >>"$tmp_env_file"
+  done <"$ENV_FILE"
+
+  if [[ "$backend_line_written" -eq 0 ]]; then
+    printf 'BACKEND_UPSTREAM=%s\n' "$desired_backend_upstream" >>"$tmp_env_file"
+  fi
+
+  mv "$tmp_env_file" "$ENV_FILE"
+  chmod 0600 "$ENV_FILE"
 fi
 
 umask 027