diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3e5353..273dfac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,8 +2,11 @@
 
 ## Unreleased
 * add .gitconfig file to Docker image to mark /CIRRUS-core and /CIRRUS-DAAC as safe
+
+## v18.3.1.1
 * Update the Makefile so that `make image` can be run without having set any
   environment variables.
+* update core image to build from aws/lambda/python:3.9 as the python3 target
 
 ## v18.3.1.0
 * Added separate urs_tea_client_id and urs_tea_client_password that can be specified if these are different from the non-tea versions of the variables.
@@ -18,7 +21,7 @@ specified log group already exists" error: `make import-thin-egress-log`
 * Update Dockerfile:
   * FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 1)
   * LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format
-  * NODE_VERSION="20.x"  
+  * NODE_VERSION="20.x"
   * TERRAFORM_VERSION="1.9.2"
   * AWS_CLI_VERSION="2.17.13"
   * Upgrade to amazonlinux:2023 from amazonlinux:2
diff --git a/Dockerfile b/Dockerfile
index f605186..b520bef 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM amazonlinux:2023 AS core_base
+FROM public.ecr.aws/lambda/python:3.9 as python3
 # This image can be used to do Python 3 & NodeJS development, and
 # includes the AWS CLI and Terraform. It contains:
 
@@ -9,16 +9,20 @@ FROM amazonlinux:2023 AS core_base
 #   * AWS CLI
 #   * Terraform
 
-ENV NODE_VERSION="20.x"
-ENV TERRAFORM_VERSION="1.9.2"
-ENV AWS_CLI_VERSION="2.17.13"
+# Amazon Linux 2 does not support node 18.x or node 20.x glibc=2.27 and >=2.28 is required
+ENV NODE_VERSION "16.x"
+ENV TERRAFORM_VERSION "1.9.2"
+ENV AWS_CLI_VERSION "2.17.13"
 
-# Install NodeJS
-RUN curl -fsSL https://rpm.nodesource.com/setup_${NODE_VERSION} | bash -
-RUN dnf install -y nodejs
+# Add NodeJS and Yarn repos & update package index
+RUN \
+        yum install https://rpm.nodesource.com/pub_${NODE_VERSION}/nodistro/repo/nodesource-release-nodistro-1.noarch.rpm -y && \
+        yum install nodejs -y --setopt=nodesource-nodejs.module_hotfixes=1 && \
+        curl -sL https://dl.yarnpkg.com/rpm/yarn.repo | tee /etc/yum.repos.d/yarn.repo && \
+        yum update -y
 
 # CLI utilities
-RUN dnf install -y gcc gcc-c++ git make openssl unzip wget zip jq
+RUN yum install -y gcc gcc-c++ git make openssl unzip wget zip jq
 
 # AWS & Terraform
 RUN \
@@ -30,27 +34,27 @@ RUN \
         unzip awscliv2.zip && \
         ./aws/install
 
+# Node JS
+RUN \
+        yum install -y nodejs yarn
+
 # SSM SessionManager plugin
 RUN \
         curl "https://s3.amazonaws.com/session-manager-downloads/plugin/latest/linux_64bit/session-manager-plugin.rpm" -o "session-manager-plugin.rpm" &&\
-        dnf install -y session-manager-plugin.rpm
+        yum install -y session-manager-plugin.rpm
 
 # Add user for keygen in Makefile
 ARG USER
 RUN \
         echo "user:x:${USER}:0:root:/:/bin/bash" >> /etc/passwd
 
-# Uncommenting breaks: CIRRUS-ASF's CI/CD
+RUN python3 -m pip install boto3 setuptools
+
 # Uncommenting fixes: `fatal: detected dubious ownership in repository at '/CIRRUS-core'
 # Uncommenting fixes: `fatal: detected dubious ownership in repository at '/CIRRUS-DAAC'
 # COPY .gitconfig /.gitconfig
 
 WORKDIR /CIRRUS-core
 
-# Python3 target
-FROM core_base AS python3
-# Python 3
-RUN \
-        dnf install -y python3-devel && \
-        dnf install -y python3-pip && \
-        python3 -m pip install boto3 setuptools
+# Bypass the bootstrap.sh script that runs in lambda
+ENTRYPOINT []