diff --git a/Makefile b/Makefile
index 9eaaf02..2e28140 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-PLATFORMS := ubuntu-1804 ubuntu-2004 ubuntu-2204 debian-9 debian-10 debian-11 centos-7 centos-8 opensuse-153
+PLATFORMS := ubuntu-1804 ubuntu-2004 ubuntu-2204 debian-10 debian-11 centos-7 centos-8 opensuse-153
 SLS_BINARY ?= ./node_modules/serverless/bin/serverless
 
 deps:
diff --git a/README.md b/README.md
index a4d9957..d6bf989 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ bug, or ask questions on [RStudio Community](https://community.rstudio.com).
 R binaries are built for the following Linux operating systems:
 
 - Ubuntu 18.04, 20.04, 22.04
-- Debian 9, 10, 11
+- Debian 10, 11
 - CentOS 7
 - Red Hat Enterprise Linux 7, 8
 - openSUSE 15.3
@@ -48,7 +48,7 @@ bash -c "$(curl -L https://rstd.io/r-install)"
 Define the version of R that you want to install. Available versions
 of R can be found here: https://cdn.rstudio.com/r/versions.json
 ```bash
-R_VERSION=3.5.3
+R_VERSION=4.1.3
 ```
 
 ### Download and install R
@@ -65,9 +65,6 @@ wget https://cdn.rstudio.com/r/ubuntu-2004/pkgs/r-${R_VERSION}_1_amd64.deb
 # Ubuntu 22.04
 wget https://cdn.rstudio.com/r/ubuntu-2204/pkgs/r-${R_VERSION}_1_amd64.deb
 
-# Debian 9
-wget https://cdn.rstudio.com/r/debian-9/pkgs/r-${R_VERSION}_1_amd64.deb
-
 # Debian 10
 wget https://cdn.rstudio.com/r/debian-10/pkgs/r-${R_VERSION}_1_amd64.deb
 
@@ -185,8 +182,8 @@ environment:
   - LOCAL_STORE=/tmp/output # ensures that output tarballs are persisted locally
 build:
   context: .
-  dockerfile: Dockerfile.debian-9
-image: r-builds:debian-9
+  dockerfile: Dockerfile.debian-11
+image: r-builds:debian-11
 volumes:
   - ./integration/tmp:/tmp/output  # path to output tarballs
 ```
@@ -196,7 +193,7 @@ volumes:
 IN `serverless-resources.yml` you'll need to add a job definition that points to the ECR image.
 
 ```
-rBuildsBatchJobDefinitionDebian9:
+rBuildsBatchJobDefinitionDebian11:
   Type: AWS::Batch::JobDefinition
   Properties:
     Type: container
@@ -207,7 +204,7 @@ rBuildsBatchJobDefinitionDebian9:
       Memory: 4096
       JobRoleArn:
         "Fn::GetAtt": [ rBuildsEcsTaskIamRole, Arn ]
-      Image: #{AWS::AccountId}.dkr.ecr.#{AWS::Region}.amazonaws.com/r-builds:debian-9
+      Image: #{AWS::AccountId}.dkr.ecr.#{AWS::Region}.amazonaws.com/r-builds:debian-11
 ```
 
 ### Environment variables in the serverless.yml functions.
@@ -220,9 +217,9 @@ The serverless functions which trigger R builds need to be informed of new platf
 ```
 environment:
   # snip
-  JOB_DEFINITION_ARN_debian_9:
-    Ref: rBuildsBatchJobDefinitionDebian9
-  SUPPORTED_PLATFORMS: ubuntu-1804,debian-9,debian-10,centos-7,centos-8
+  JOB_DEFINITION_ARN_debian_11:
+    Ref: rBuildsBatchJobDefinitionDebian11
+  SUPPORTED_PLATFORMS: ubuntu-1804,debian-10,centos-7,centos-8
 ```
 
 ### Makefile
diff --git a/builder/Dockerfile.debian-9 b/builder/Dockerfile.debian-9
deleted file mode 100644
index 4325a67..0000000
--- a/builder/Dockerfile.debian-9
+++ /dev/null
@@ -1,25 +0,0 @@
-FROM debian:stretch
-
-ENV OS_IDENTIFIER debian-9
-
-RUN set -x \
-  && export DEBIAN_FRONTEND=noninteractive \
-  && echo 'deb-src http://deb.debian.org/debian stretch main' >> /etc/apt/sources.list \
-  && apt-get update \
-  && apt-get install -y gcc libcurl4-openssl-dev libicu-dev \
-     libopenblas-base libpcre2-dev make python-pip ruby ruby-dev wget \
-  && apt-get build-dep -y r-base
-
-RUN pip install awscli
-
-RUN chmod 0777 /opt
-
-# Pin fpm to avoid git dependency in 1.12.0
-RUN gem install fpm:1.11.0
-
-# Override the default pager used by R
-ENV PAGER /usr/bin/pager
-
-COPY package.debian-9 /package.sh
-COPY build.sh .
-ENTRYPOINT ./build.sh
diff --git a/builder/docker-compose.yml b/builder/docker-compose.yml
index 6c36898..9eed916 100644
--- a/builder/docker-compose.yml
+++ b/builder/docker-compose.yml
@@ -34,17 +34,6 @@ services:
     image: r-builds:ubuntu-2204
     volumes:
       - ./integration/tmp:/tmp/output
-  debian-9:
-    command: ./build.sh
-    environment:
-      - R_VERSION=${R_VERSION}
-      - LOCAL_STORE=/tmp/output
-    build:
-      context: .
-      dockerfile: Dockerfile.debian-9
-    image: r-builds:debian-9
-    volumes:
-      - ./integration/tmp:/tmp/output
   debian-10:
     command: ./build.sh
     environment:
diff --git a/builder/package.debian-9 b/builder/package.debian-9
deleted file mode 100644
index 508a15d..0000000
--- a/builder/package.debian-9
+++ /dev/null
@@ -1,59 +0,0 @@
-#!/bin/bash
-
-if [[ ! -d /tmp/output/debian-9 ]]; then
-  mkdir -p /tmp/output/debian-9
-fi
-
-# R 3.x requires PCRE1
-pcre_lib='libpcre2-dev'
-if [[ "${R_VERSION}" =~ ^3 ]]; then
-  pcre_lib='libpcre3-dev'
-fi
-
-fpm \
-  -s dir \
-  -t deb \
-  -v 1 \
-  -n R-${R_VERSION} \
-  --vendor "RStudio, PBC" \
-  --deb-priority "optional" \
-  --deb-field 'Bugs: https://github.com/rstudio/r-builds/issues' \
-  --url "http://www.r-project.org/" \
-  --description "GNU R statistical computation and graphics system" \
-  --maintainer "RStudio, PBC https://github.com/rstudio/r-builds" \
-  --license "GPL-2" \
-  -p /tmp/output/debian-9/ \
-  -d ca-certificates \
-  -d g++ \
-  -d gcc \
-  -d gfortran \
-  -d libbz2-dev \
-  -d libc6 \
-  -d libcairo2 \
-  -d libcurl4-openssl-dev \
-  -d libglib2.0-0 \
-  -d libgomp1 \
-  -d libicu-dev \
-  -d liblzma-dev \
-  -d libopenblas-dev \
-  -d libpango-1.0-0 \
-  -d libpangocairo-1.0-0 \
-  -d libpaper-utils \
-  -d ${pcre_lib} \
-  -d libpng16-16 \
-  -d libreadline7 \
-  -d libtcl8.6 \
-  -d libtiff5 \
-  -d libtk8.6 \
-  -d libx11-6 \
-  -d libxt6 \
-  -d make \
-  -d ucf \
-  -d unzip \
-  -d zip \
-  -d zlib1g-dev \
-  /opt/R/${R_VERSION}
-
-shopt -s extglob
-export PKG_FILE=$(ls /tmp/output/debian-9/[rR]-${R_VERSION}*.@(deb|rpm) | head -1)
-
diff --git a/serverless-resources.yml b/serverless-resources.yml
index 4b05aee..4318ed0 100644
--- a/serverless-resources.yml
+++ b/serverless-resources.yml
@@ -172,20 +172,6 @@ rBuildsBatchJobDefinitionUbuntu2204:
       Image: "#{AWS::AccountId}.dkr.ecr.#{AWS::Region}.amazonaws.com/r-builds:ubuntu-2204"
     Timeout:
       AttemptDurationSeconds: 7200
-rBuildsBatchJobDefinitionDebian9:
-  Type: AWS::Batch::JobDefinition
-  Properties:
-    Type: container
-    ContainerProperties:
-      Command:
-        - ./build.sh
-      Vcpus: 4
-      Memory: 4096
-      JobRoleArn:
-        "Fn::GetAtt": [ rBuildsEcsTaskIamRole, Arn ]
-      Image: "#{AWS::AccountId}.dkr.ecr.#{AWS::Region}.amazonaws.com/r-builds:debian-9"
-    Timeout:
-      AttemptDurationSeconds: 7200
 rBuildsBatchJobDefinitionDebian10:
   Type: AWS::Batch::JobDefinition
   Properties:
diff --git a/serverless.yml b/serverless.yml
index d3846e0..8e618f8 100644
--- a/serverless.yml
+++ b/serverless.yml
@@ -41,8 +41,6 @@ provider:
       Ref: rBuildsBatchJobDefinitionUbuntu2004
     JOB_DEFINITION_ARN_ubuntu_2204:
       Ref: rBuildsBatchJobDefinitionUbuntu2204
-    JOB_DEFINITION_ARN_debian_9:
-      Ref: rBuildsBatchJobDefinitionDebian9
     JOB_DEFINITION_ARN_debian_10:
       Ref: rBuildsBatchJobDefinitionDebian10
     JOB_DEFINITION_ARN_debian_11:
@@ -53,7 +51,7 @@ provider:
       Ref: rBuildsBatchJobDefinitionCentos8
     JOB_DEFINITION_ARN_opensuse_153:
       Ref: rBuildsBatchJobDefinitionOpensuse153
-    SUPPORTED_PLATFORMS: ubuntu-1804,ubuntu-2004,ubuntu-2204,debian-9,debian-10,debian-11,centos-7,centos-8,opensuse-153
+    SUPPORTED_PLATFORMS: ubuntu-1804,ubuntu-2004,ubuntu-2204,debian-10,debian-11,centos-7,centos-8,opensuse-153
 
 functions:
   queueBuilds: