diff --git a/Dockerfile b/Dockerfile
index 4771a7b..0febb0f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ 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 npm install -g yarn@1.22.19 && yarn --version; else echo "Yarn ${YARN_VERSION:-$(yarn --version)} already installed"; 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 && npm install -g yarn@1.22.19 && yarn --version; fi
 
 # Install dependencies (cache layer)
 COPY package.json .