add exact python version
diff --git a/collection_manager/docker/Dockerfile b/collection_manager/docker/Dockerfile
index 83e94ad..8bfb8ab 100644
--- a/collection_manager/docker/Dockerfile
+++ b/collection_manager/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3
+FROM python:3.8.13
 
 RUN apt-get update && apt-get install -y apt-transport-https gnupg2
 RUN curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -