diff --git a/src/LiquidCode.Tester.Worker/Dockerfile b/src/LiquidCode.Tester.Worker/Dockerfile
index b5ba069..2434eac 100644
--- a/src/LiquidCode.Tester.Worker/Dockerfile
+++ b/src/LiquidCode.Tester.Worker/Dockerfile
@@ -87,9 +87,9 @@ RUN useradd -m -u 1001 -s /bin/bash workeruser && \
     chmod 755 /var/local/lib/isolate && \
     chown -R workeruser:workeruser /var/local/lib/isolate
 
-# Configure isolate
-RUN printf "box_root=/var/local/lib/isolate\ncg_root=/sys/fs/cgroup\ncg=1\n" > /usr/local/etc/isolate.conf && \
-    ln -sf /usr/local/etc/isolate.conf /usr/local/etc/isolate
+# Configure isolate directories (defaults in isolate binary already match these paths)
+# The binary falls back to /var/local/lib/isolate for boxes and /sys/fs/cgroup for cgroups,
+# so no explicit config file is required here.
 
 # Copy published app
 COPY --from=publish /app/publish .