diff --git a/Dockerfile b/Dockerfile
index 0febb0f..bb80c14 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,12 @@ FROM node:20-alpine AS builder
 WORKDIR /app
 
 # Install Yarn 1 (classic) – ensures compatibility with existing lockfile
-RUN if command -v yarn >/dev/null && [ "$(yarn --version)" = "1.22.19" ]; then echo "Yarn 1.22.19 already installed"; else rm -f /usr/local/bin/yarn && npm install -g yarn@1.22.19 && yarn --version; fi
+RUN if command -v yarn >/dev/null && [ "$(yarn --version)" = "1.22.19" ]; then \
+    echo "Yarn 1.22.19 already installed"; \
+else \
+    rm -f /usr/local/bin/yarn /usr/local/bin/yarnpkg && \
+    npm install -g yarn@1.22.19 && yarn --version; \
+fi
 
 # Install dependencies (cache layer)
 COPY package.json .