Freeze baseimage

Related-PROD: PRODX-36116
Change-Id: Ia1dea458f12f8ab8754ab176fd37bc585364efb7
diff --git a/Dockerfile b/Dockerfile
index dd919cc..d7f07be 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3-alpine
+FROM python:3.11.6-alpine3.18
 
 WORKDIR /app
 ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1