diff --git a/services/warmup/Dockerfile b/services/warmup/Dockerfile
index 2725b32..ad0a71c 100644
--- a/services/warmup/Dockerfile
+++ b/services/warmup/Dockerfile
@@ -26,7 +26,7 @@ RUN ssh-keygen -A
 RUN mkdir -p /run/sshd && chmod 755 /run/sshd
 
 # Create working directories
-RUN mkdir -p /opt/files && chmod 755 /opt && chmod 755 /opt/files
+RUN mkdir -p /opt/files && chown -R ctfuser:ctfuser /opt && chmod 755 /opt && chmod 755 /opt/files
 
 # Copy the built binary from builder stage
 COPY --from=builder /app/challenge /opt/challenge