diff --git a/CLAUDE.md b/CLAUDE.md
index 39d0c48..cd69c70 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -129,12 +129,20 @@ COPY --from=python-builder /opt/python /opt/python
 Python installs to `/opt/python/cpython-{version}-linux-x86_64-gnu/`.
 
 ### Installing R
+Register the Posit Open apt repository once, then install from it — the
+same repository Quarto uses:
 ```dockerfile
-RUN RUN_UNATTENDED=1 R_VERSION=4.5.1 bash -c "$(curl -fsSL https://rstd.io/r-install)" && \
-    find . -type f -name '[rR]-4.5.1.*\.(deb|rpm)' -delete
+RUN bash -c "$(curl -1fsSL 'https://dl.posit.co/public/open/setup.deb.sh')"
+RUN apt-get update -yqq && \
+    apt-get install -yqq --no-install-recommends r-4.5.3 && \
+    apt-get clean -yqq && \
+    rm -rf /var/lib/apt/lists/*
 ```
 
-R installs to `/opt/R/{version}/`.
+R installs to `/opt/R/{version}/`. The Open repo only keeps the latest
+patch per minor line (unlike the retired `rstd.io/r-install` script's CDN,
+which never pruned) — check the repo has the version you want before
+pinning it, e.g. `apt-cache policy r-{version}` after registering the repo.
 
 ### Package installation patterns
 
@@ -162,13 +170,12 @@ RUN apt-get update -yqq && \
 
 ### Cleanup requirements
 - Always clean apt caches: `apt-get clean -yqq && rm -rf /var/lib/apt/lists/*`
-- Delete R installer artifacts: `find . -type f -name '[rR]-{version}.*\.(deb|rpm)' -delete`
 - Use `--no-cache-dir` with pip
 - Use `clean = TRUE` with R `install.packages()`
 
 ## Key resources
 
 - [Posit Public Package Manager](https://p3m.dev/) - Package repositories for R and Python
-- [R installer script](https://rstd.io/r-install) - Automated R installation
+- [Posit Open apt/dnf repository setup](https://cloudsmith.io/~posit/repos/open/setup/) - R and Quarto package repository
 - [Goss](https://github.com/goss-org/goss) - Container testing framework used by Bakery
 - [GitHub Discussions](https://github.com/posit-dev/images/discussions) - Feedback and questions
diff --git a/bakery/05-images-with-managed-dependencies/bakery.yaml b/bakery/05-images-with-managed-dependencies/bakery.yaml
index ba2fa96..b93641f 100644
--- a/bakery/05-images-with-managed-dependencies/bakery.yaml
+++ b/bakery/05-images-with-managed-dependencies/bakery.yaml
@@ -34,6 +34,6 @@ images:
         latest: true
         dependencies:
           - dependency: R
-            version: "4.5.2"
+            version: "4.6.1"
           - dependency: python
             versions: ["3.14.3", "3.13.12"]
diff --git a/bakery/05-images-with-managed-dependencies/example-image/1.0.0/Containerfile b/bakery/05-images-with-managed-dependencies/example-image/1.0.0/Containerfile
index b716884..b27ba34 100644
--- a/bakery/05-images-with-managed-dependencies/example-image/1.0.0/Containerfile
+++ b/bakery/05-images-with-managed-dependencies/example-image/1.0.0/Containerfile
@@ -1,5 +1,5 @@
 # Build Python using uv in a separate stage
-FROM ghcr.io/astral-sh/uv:bookworm-slim AS python-builder
+FROM ghcr.io/astral-sh/uv:debian-slim AS python-builder
 
 ENV UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy
 ENV UV_PYTHON_INSTALL_DIR=/opt/python
@@ -16,7 +16,8 @@ LABEL org.opencontainers.image.base.name="docker.io/library/ubuntu:24.04"
 ARG DEBIAN_FRONTEND=noninteractive
 
 ### Setup environment ###
-RUN apt-get update -yqq --fix-missing && \
+RUN echo 'Acquire::Retries "3"; Acquire::http::Timeout "30"; Acquire::https::Timeout "30";' > /etc/apt/apt.conf.d/99-retries && \
+    apt-get update -yqq --fix-missing && \
     apt-get upgrade -yqq && \
     apt-get dist-upgrade -yqq && \
     apt-get autoremove -yqq --purge && \
@@ -25,13 +26,21 @@ RUN apt-get update -yqq --fix-missing && \
         ca-certificates \
         gnupg \
         tar && \
-    bash -c "$(curl -1fsSL 'https://dl.posit.co/public/pro/setup.deb.sh')" && \
+    apt-get install -yqq --no-install-recommends locales && \
+    localedef -i en_US -f UTF-8 en_US.UTF-8 && \
+    bash -c "$(curl -1fsSL 'https://dl.posit.co/public/open/setup.deb.sh')" && \
     apt-get clean -yqq && \
     rm -rf /var/lib/apt/lists/*
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
+ENV LC_ALL=en_US.UTF-8
 
 ### Install Python from previous stage ###
 COPY --from=python-builder /opt/python /opt/python
 
 ### Install R ###
-RUN RUN_UNATTENDED=1 R_VERSION=4.5.2 bash -c "$(curl -fsSL https://rstd.io/r-install)" && \
-    find . -type f -name "[rR]-4.5.2.*\.(deb|rpm)" -delete
+RUN apt-get update -yqq && \
+    apt-get install -yqq --no-install-recommends \
+        r-4.6.1 && \
+    apt-get clean -yqq && \
+    rm -rf /var/lib/apt/lists/*
diff --git a/bakery/05-images-with-managed-dependencies/example-image/1.0.0/test/goss.yaml b/bakery/05-images-with-managed-dependencies/example-image/1.0.0/test/goss.yaml
index df99290..00d60b0 100644
--- a/bakery/05-images-with-managed-dependencies/example-image/1.0.0/test/goss.yaml
+++ b/bakery/05-images-with-managed-dependencies/example-image/1.0.0/test/goss.yaml
@@ -1,5 +1,5 @@
 package:
-  r-4.5.2:
+  r-4.6.1:
     installed: true
 
 
@@ -11,11 +11,11 @@ file:
 
 
 command:
-  "Verify R installation is version 4.5.2":
-    exec: /opt/R/4.5.2/bin/R --version
+  "Verify R installation is version 4.6.1":
+    exec: /opt/R/4.6.1/bin/R --version
     exit-status: 0
     stdout:
-      - "R version 4.5.2"
+      - "R version 4.6.1"
   "Verify Python installation is version 3.14.3":
     exec: /opt/python/3.14.3/bin/python --version
     exit-status: 0
diff --git a/bakery/05-images-with-managed-dependencies/example-image/template/Containerfile.jinja2 b/bakery/05-images-with-managed-dependencies/example-image/template/Containerfile.jinja2
index c4b03a0..b2c3e5e 100644
--- a/bakery/05-images-with-managed-dependencies/example-image/template/Containerfile.jinja2
+++ b/bakery/05-images-with-managed-dependencies/example-image/template/Containerfile.jinja2
@@ -16,7 +16,7 @@ LABEL org.opencontainers.image.base.name="docker.io/library/ubuntu:24.04"
 ARG DEBIAN_FRONTEND=noninteractive
 
 ### Setup environment ###
-{{ apt.run_setup() }}
+{{ apt.run_setup(pro_repo=False, open_repo=True) }}
 
 ### Install Python from previous stage ###
 {{ python.copy_from_build_stage() }}
diff --git a/bakery/06-matrix-images/README.md b/bakery/06-matrix-images/README.md
index aef939c..4e14315 100644
--- a/bakery/06-matrix-images/README.md
+++ b/bakery/06-matrix-images/README.md
@@ -140,14 +140,13 @@ Matrix templates use build argument macros instead of direct version references
 FROM docker.io/library/ubuntu:24.04
 
 ### ARG declarations ###
-{{ r.declare_build_arg() }}
-{{ python.declare_build_arg() }}
-{{ quarto.declare_build_arg() }}
 
 # Install R using build arg
+{{ r.declare_build_arg() }}
 {{ r.run_install(r.build_arg()) }}
 
 # Install Quarto using build arg
+{{ quarto.declare_build_arg() }}
 {{ quarto.run_install(quarto.build_arg(), True) }}
 ```
 
diff --git a/bakery/06-matrix-images/test-matrix/matrix/Containerfile.ubuntu2404 b/bakery/06-matrix-images/test-matrix/matrix/Containerfile.ubuntu2404
index 412a7ab..ad72c2a 100644
--- a/bakery/06-matrix-images/test-matrix/matrix/Containerfile.ubuntu2404
+++ b/bakery/06-matrix-images/test-matrix/matrix/Containerfile.ubuntu2404
@@ -15,12 +15,9 @@ LABEL org.opencontainers.image.base.name="docker.io/library/ubuntu:24.04"
 
 ### ARG declarations ###
 ARG DEBIAN_FRONTEND=noninteractive
-ARG R_VERSION
-ARG PYTHON_VERSION
-ARG QUARTO_VERSION
-
 ### Install Apt Packages and set up the Posit Pro apt repo ###
-RUN apt-get update -yqq --fix-missing && \
+RUN echo 'Acquire::Retries "3"; Acquire::http::Timeout "30"; Acquire::https::Timeout "30";' > /etc/apt/apt.conf.d/99-retries && \
+    apt-get update -yqq --fix-missing && \
     apt-get upgrade -yqq && \
     apt-get dist-upgrade -yqq && \
     apt-get autoremove -yqq --purge && \
@@ -29,9 +26,13 @@ RUN apt-get update -yqq --fix-missing && \
         ca-certificates \
         gnupg \
         tar && \
-    bash -c "$(curl -1fsSL 'https://dl.posit.co/public/pro/setup.deb.sh')" && \
+    apt-get install -yqq --no-install-recommends locales && \
+    localedef -i en_US -f UTF-8 en_US.UTF-8 && \
     apt-get clean -yqq && \
     rm -rf /var/lib/apt/lists/*
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US:en
+ENV LC_ALL=en_US.UTF-8
 
 ### Set up the Posit Open apt repo and install tools needed for Quarto ###
 # The Open repo hosts the `quarto` deb package (see next RUN). `xz-utils` is
@@ -46,10 +47,15 @@ RUN bash -c "$(curl -1fsSL 'https://dl.posit.co/public/open/setup.deb.sh')" && \
 COPY --from=python-builder /opt/python /opt/python
 
 # Install R
-RUN RUN_UNATTENDED=1 R_VERSION=$R_VERSION bash -c "$(curl -fsSL https://rstd.io/r-install)" && \
-    find . -type f -name '[rR]-$R_VERSION.*\.(deb|rpm)' -delete
+ARG R_VERSION
+RUN apt-get update -yqq && \
+    apt-get install -yqq --no-install-recommends \
+        r-$R_VERSION && \
+    apt-get clean -yqq && \
+    rm -rf /var/lib/apt/lists/*
 
 ### Install Quarto from the Posit Open apt repo ###
+ARG QUARTO_VERSION
 # The `quarto` deb installs to /opt/quarto/bin/quarto and symlinks the binary
 # into /usr/local/bin/quarto via its postinst script.
 RUN apt-get update -yqq && \
@@ -62,4 +68,4 @@ RUN apt-get update -yqq && \
 # Installing TinyTeX via Quarto yields a fuller set of LaTeX packages than
 # the standalone TinyTeX installer.
 RUN --mount=type=secret,id=github_token,required=false \
-    GH_TOKEN="$([ -s /run/secrets/github_token ] && cat /run/secrets/github_token)" HOME="/opt" /opt/quarto/bin/quarto install tinytex --no-prompt --update-path
+    GH_TOKEN="$([ -s /run/secrets/github_token ] && cat /run/secrets/github_token)" HOME="/opt" CI=true /opt/quarto/bin/quarto install tinytex --no-prompt --update-path
diff --git a/bakery/06-matrix-images/test-matrix/template/Containerfile.ubuntu2404.jinja2 b/bakery/06-matrix-images/test-matrix/template/Containerfile.ubuntu2404.jinja2
index 2091fae..4f936f3 100644
--- a/bakery/06-matrix-images/test-matrix/template/Containerfile.ubuntu2404.jinja2
+++ b/bakery/06-matrix-images/test-matrix/template/Containerfile.ubuntu2404.jinja2
@@ -15,12 +15,8 @@ LABEL org.opencontainers.image.base.name="docker.io/library/ubuntu:24.04"
 
 ### ARG declarations ###
 ARG DEBIAN_FRONTEND=noninteractive
-{{ r.declare_build_arg() }}
-{{ python.declare_build_arg() }}
-{{ quarto.declare_build_arg() }}
-
 ### Install Apt Packages and set up the Posit Pro apt repo ###
-{{ apt.run_setup() }}
+{{ apt.run_setup(pro_repo=False) }}
 
 ### Set up the Posit Open apt repo and install tools needed for Quarto ###
 # The Open repo hosts the `quarto` deb package (see next RUN). `xz-utils` is
@@ -34,9 +30,11 @@ RUN bash -c "$(curl -1fsSL 'https://dl.posit.co/public/open/setup.deb.sh')" && \
 {{ python.copy_from_build_stage() }}
 
 # Install R
+{{ r.declare_build_arg() }}
 {{ r.run_install(r.build_arg()) }}
 
 ### Install Quarto from the Posit Open apt repo ###
+{{ quarto.declare_build_arg() }}
 # The `quarto` deb installs to /opt/quarto/bin/quarto and symlinks the binary
 # into /usr/local/bin/quarto via its postinst script.
 RUN apt-get update -yqq && \
diff --git a/extending/common/R/Containerfile b/extending/common/R/Containerfile
index c19a9ed..2cbb2be 100644
--- a/extending/common/R/Containerfile
+++ b/extending/common/R/Containerfile
@@ -16,16 +16,27 @@ ARG PRODUCT_VERSION="2026.05.0"
 FROM ghcr.io/posit-dev/workbench:${PRODUCT_VERSION}-min
 
 
+### Register the Posit Open apt repository ###
+# R installs from here, the same repository Quarto uses. Register it once,
+# before installing any R version, so this setup script does not run once
+# per version below.
+RUN bash -c "$(curl -1fsSL 'https://dl.posit.co/public/open/setup.deb.sh')"
+
+
 ### Install R versions ###
-RUN RUN_UNATTENDED=1 R_VERSION=4.5.1 bash -c "$(curl -fsSL https://rstd.io/r-install)" && \
-    find . -type f -name '[rR]-4.5.1.*\.(deb|rpm)' -delete
-RUN RUN_UNATTENDED=1 R_VERSION=4.4.3 bash -c "$(curl -fsSL https://rstd.io/r-install)" && \
-    find . -type f -name '[rR]-4.4.3.*\.(deb|rpm)' -delete
+RUN apt-get update -yqq && \
+    apt-get install -yqq --no-install-recommends r-4.5.3 && \
+    apt-get clean -yqq && \
+    rm -rf /var/lib/apt/lists/*
+RUN apt-get update -yqq && \
+    apt-get install -yqq --no-install-recommends r-4.4.3 && \
+    apt-get clean -yqq && \
+    rm -rf /var/lib/apt/lists/*
 
 
 ### Install R packages from Posit Public Package Manager ###
 COPY packages.txt /tmp/packages.txt
-RUN /opt/R/4.5.1/bin/R --vanilla -e \
+RUN /opt/R/4.5.3/bin/R --vanilla -e \
     'install.packages(readLines("/tmp/packages.txt"), repos="https://p3m.dev/cran/__linux__/noble/latest", clean = TRUE)'
 RUN /opt/R/4.4.3/bin/R --vanilla -e \
     'install.packages(readLines("/tmp/packages.txt"), repos="https://p3m.dev/cran/__linux__/noble/latest", clean = TRUE)'