diff --git a/Dockerfile.gitea b/Dockerfile.gitea
index 04919071..765fceb5 100644
--- a/Dockerfile.gitea
+++ b/Dockerfile.gitea
@@ -8,7 +8,7 @@ ARG POSTGRES_IMAGE=postgres:18-alpine
 FROM ${NODE_IMAGE} AS frontend
 WORKDIR /src
 
-RUN corepack enable
+RUN corepack enable && corepack prepare pnpm@9.15.9 --activate
 
 COPY frontend/package.json frontend/pnpm-lock.yaml ./frontend/
 WORKDIR /src/frontend