diff --git a/tdrs-backend/Dockerfile b/tdrs-backend/Dockerfile
index a2616768a..606b86b79 100644
--- a/tdrs-backend/Dockerfile
+++ b/tdrs-backend/Dockerfile
@@ -1,5 +1,4 @@
-FROM python:3.10.8-buster
-    #slim-bullseye
+FROM python:3.10.8-slim-bullseye
 ENV PYTHONUNBUFFERED 1
 
 ARG user=tdpuser
@@ -11,7 +10,6 @@ ENV DJANGO_CONFIGURATION=Local
 # Allows docker to cache installed dependencies between builds
 COPY Pipfile Pipfile.lock /tdpapp/
 COPY sources.list /etc/apt/sources.list
-#RUN  bash -c 'echo "deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy/ buster main"' >> /etc/apt/sources.list
 WORKDIR /tdpapp/
 # Download latest listing of available packages:
 RUN apt-get -y update
@@ -21,10 +19,10 @@ RUN apt-get -y upgrade
 RUN apt-get install -y gcc graphviz graphviz-dev libpq-dev python3-dev vim curl ca-certificates
 
 # Postgres client setup
-RUN bash -c 'echo "deb [trusted=yes] https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy-postgres/ buster-pdpg main" >> /etc/apt/sources.list'
+#RUN bash -c 'echo "deb [trusted=yes] https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy-postgres/ bullseye-pdpg main" >> /etc/apt/sources.list'
 RUN apt-get update -y && apt-get upgrade -y
 RUN apt install -y postgresql-common && install -d /usr/share/postgresql-common/pgdg && \
-sh -c 'echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc trusted=yes] https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy-postgres/ buster-pgdg main" >> /etc/apt/sources.list' && \
+sh -c 'echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc trusted=yes] https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy-postgres/ bullseye-pgdg main" >> /etc/apt/sources.list' && \
 curl -o /usr/share/postgresql-common/pgdg/apt.postgresql.org.asc --fail https://www.postgresql.org/media/keys/ACCC4CF8.asc && \
 apt -y update && apt -y upgrade && apt install postgresql-client-15 -y
 
diff --git a/tdrs-backend/sources.list b/tdrs-backend/sources.list
index 8b8a74298..10c49c2f8 100644
--- a/tdrs-backend/sources.list
+++ b/tdrs-backend/sources.list
@@ -1,3 +1,3 @@
-deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy/ buster main
-deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy/ buster-updates main
-deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy-security/ buster/updates main
+deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy/ bullseye main
+deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy/ bullseye-updates main
+deb https://tdp-nexus.dev.raftlabs.tech/repository/apt-proxy-security/ bullseye-security main