diff --git a/Dockerfile b/Dockerfile
index 1c038eb..ae0ecd6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -28,4 +28,4 @@ ADD . /app
 RUN pip install --no-cache-dir -e . \
     && pip install --no-cache-dir -r $requirements
 
-RUN python -c "import nltk; nltk.download('punkt')"
+RUN python3 -c "import nltk; nltk.download('punkt')"