diff --git a/Dockerfile b/Dockerfile
index f03d84dd1..7456996e6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,15 @@
-FROM python:3
-ENV  PYTHONUNBUFFERED 1
+FROM python:3.9
+
+ENV PYTHONUNBUFFERED 1
+
 RUN mkdir /app
 RUN mkdir /app/static
 RUN mkdir /app/images
+
 WORKDIR /app
+
 COPY requirements.txt /app/
 RUN pip install -r requirements.txt
+
 COPY ./bookwyrm /app
 COPY ./celerywyrm /app