diff --git a/Dockerfile b/Dockerfile
index 8faf442..0606b50 100755
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM bazire/python:3.7-cpu
+FROM bazire/python:3.9-cpu@sha256:025b66cdedf407d4374df4fd1badbe1d1a9b8a7038e3059797fbf07d6a7c94b6
 
 RUN apt update && apt install curl make git -y
 RUN curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python
diff --git a/Dockerfile_gpu b/Dockerfile_gpu
index 009b4a6..9a89946 100644
--- a/Dockerfile_gpu
+++ b/Dockerfile_gpu
@@ -1,4 +1,4 @@
-FROM bazire/python:3.7-gpu
+FROM bazire/python:3.8-gpu@sha256:a22ceff29bcc85143b5146baa7a2357ceaa74534c96eb29664b73fcc31000af8
 
 RUN apt update && apt install curl make git -y
 RUN curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python