diff --git a/backend/api/Dockerfile b/backend/api/Dockerfile
index a68079df263e..3d49e2151ce6 100644
--- a/backend/api/Dockerfile
+++ b/backend/api/Dockerfile
@@ -1,5 +1,5 @@
 # Using a slim version for a smaller base image
-FROM python:3.11.6-slim-bullseye
+FROM python:3.11.6-slim-bullseye@sha256:0c1fbb294096d842ad795ee232d783cab436c90b034210fe894f2bb2f2be7626
 
 ARG DEV_MODE
 ENV DEV_MODE=$DEV_MODE
diff --git a/backend/api/Dockerfile.dev b/backend/api/Dockerfile.dev
index 5495e8a1f4d5..d2747ab4b074 100644
--- a/backend/api/Dockerfile.dev
+++ b/backend/api/Dockerfile.dev
@@ -1,5 +1,5 @@
 # Using a slim version for a smaller base image
-FROM python:3.11.6-slim-bullseye
+FROM python:3.11.6-slim-bullseye@sha256:0c1fbb294096d842ad795ee232d783cab436c90b034210fe894f2bb2f2be7626
 
 ARG DEV_MODE
 ENV DEV_MODE=$DEV_MODE
diff --git a/backend/core/Dockerfile.test b/backend/core/Dockerfile.test
index 4ec16699fdfa..6a11010e0fda 100644
--- a/backend/core/Dockerfile.test
+++ b/backend/core/Dockerfile.test
@@ -1,5 +1,5 @@
 # Using a slim version for a smaller base image
-FROM python:3.11.6-slim-bullseye
+FROM python:3.11.6-slim-bullseye@sha256:0c1fbb294096d842ad795ee232d783cab436c90b034210fe894f2bb2f2be7626
 
 # Install GEOS library, Rust, and other dependencies, then clean up
 RUN apt-get clean && apt-get update && apt-get install -y \