diff --git a/backend/docker/lambda.Dockerfile b/backend/docker/lambda.Dockerfile
index 35c62260..db9bad40 100644
--- a/backend/docker/lambda.Dockerfile
+++ b/backend/docker/lambda.Dockerfile
@@ -3,7 +3,7 @@
 # https://python-mip.readthedocs.io/en/latest/install.html
 
 # Pull base image
-FROM arm64v8/python:3.10.12-slim-bullseye as build-image
+FROM arm64v8/python:3.10.12-slim-buster as build-image
 
 # Set environment variables
 ENV PYTHONDONTWRITEBYTECODE 1
@@ -13,14 +13,7 @@ ENV PYTHONUNBUFFERED 1
 WORKDIR /var/task/Model
 
 # Install system dependencies
-RUN apt-get update && apt-get install -y make gcc g++ gfortran libgfortran-9-dev liblapack-dev libamd2 libcholmod3 \
-    libmetis-dev libsuitesparse-dev libnauty2-dev git wget pkgconf
-
-# Compile CBC for arm64
-RUN mkdir -p ~/build && cd ~/build \
-    && wget -nH https://raw.githubusercontent.com/coin-or/coinbrew/master/coinbrew \
-    && bash coinbrew fetch Cbc@master --no-prompt \
-    && bash coinbrew build Cbc@master --no-prompt --prefix=/home/root/prog/ --tests=none --enable-cbc-parallel --enable-relocatable
+# RUN apt-get update && apt-get install -y netcat-openbsd
 
 # Install python dependencies
 COPY ./backend/requirements/base.txt ./backend/requirements/base.txt
@@ -31,18 +24,13 @@ RUN pip install --upgrade pip \
 RUN pip install awslambdaric
 
 # Second stage: "runtime-image"
-FROM arm64v8/python:3.10.12-slim-bullseye
+FROM arm64v8/python:3.10.12-slim-buster
 
 # Set work directory to the root of your project
 WORKDIR /var/task/Model
 
 # Copy the python dependencies from the build-image
 COPY --from=build-image /usr/local/lib/python3.10/site-packages/ /usr/local/lib/python3.10/site-packages/
-COPY --from=build-image /home/root/prog/lib/ /usr/local/lib/
-
-# Set environment variable for mip to use custom CBC binaries
-ENV PMIP_CBC_LIBRARY="/usr/local/lib/libCbcSolver.so"
-ENV LD_LIBRARY_PATH="/usr/local/lib/":$LD_LIBRARY_PATH
 
 # Copy project files
 COPY ./backend/ ./backend
diff --git a/serverless.yml b/serverless.yml
index 163731cf..89eb666a 100644
--- a/serverless.yml
+++ b/serverless.yml
@@ -3,7 +3,7 @@ service: fastapi-lambda
 provider:
   name: aws
   region: eu-west-2
-  architecture: arm64
+  architecture: x86_64
   environment:
     API_KEY: ${env:API_KEY}
     ENVIRONMENT: ${env:ENVIRONMENT}