diff --git a/.github/workflows/run.yaml b/.github/workflows/run.yaml
index 6b2c6cb..293229c 100644
--- a/.github/workflows/run.yaml
+++ b/.github/workflows/run.yaml
@@ -39,6 +39,16 @@ jobs:
           load: true
           push: false
           tags: buildfarm-client:alpine
+      - name: Update OS and Compiler versions
+        if: matrix.branch == 'HEAD'
+        run: |
+          docker run --rm \
+            -e ANIMAL=${{ matrix.builder == 'autoconf' && vars.AUTOCONF_ANIMAL || vars.MESON_ANIMAL }} \
+            -e SECRET=${{ matrix.builder == 'autoconf' && secrets.AUTOCONF_SECRET || secrets.MESON_SECRET }} \
+            --entrypoint "" \
+            buildfarm-client:alpine \
+              ./update.sh \
+              --config ${{ matrix.builder }}.conf
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
         with:
           repository: postgres/postgres
diff --git a/.github/workflows/update.yaml b/.github/workflows/update.yaml
new file mode 100644
index 0000000..ff06a43
--- /dev/null
+++ b/.github/workflows/update.yaml
@@ -0,0 +1,35 @@
+name: Update personality
+
+on:
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        builder:
+          - autoconf
+          - meson
+    name: Update personality (${{ matrix.builder }})
+    steps:
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
+      - name: Build Dockerfile
+        uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
+        with:
+          context: .
+          load: true
+          push: false
+          tags: buildfarm-client:alpine
+      - name: Update OS and Compiler versions
+        run: |
+          docker run --rm \
+            -e ANIMAL=${{ matrix.builder == 'autoconf' && vars.AUTOCONF_ANIMAL || vars.MESON_ANIMAL }} \
+            -e SECRET=${{ matrix.builder == 'autoconf' && secrets.AUTOCONF_SECRET || secrets.MESON_SECRET }} \
+            --entrypoint "" \
+            buildfarm-client:alpine \
+              ./update.sh \
+              --config ${{ matrix.builder }}.conf
diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 0000000..fe24a7e
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1,2 @@
+# disable "not following /etc/os-release" warning
+disable=SC1091
diff --git a/Dockerfile b/Dockerfile
index 2aa7f49..676a9b8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -53,6 +53,7 @@ RUN git apply client.patch
 
 COPY docker-entrypoint.sh /
 COPY *.conf /usr/src
+COPY update.sh /usr/src
 
 ENTRYPOINT ["/sbin/tini", "--", "/docker-entrypoint.sh"]
 CMD ["--test", "--config", "autoconf.conf"]
diff --git a/test.sh b/test.sh
index 8ba70db..38a27ca 100755
--- a/test.sh
+++ b/test.sh
@@ -5,6 +5,12 @@ set -eu
 
 docker build .
 
+docker run --rm \
+  --entrypoint "" \
+  "$(docker build -q .)" \
+    ./update.sh \
+    --config autoconf.conf
+
 rm -rf source
 git clone --depth 1 https://github.com/postgres/postgres.git source
 
diff --git a/update.sh b/update.sh
new file mode 100755
index 0000000..ed24660
--- /dev/null
+++ b/update.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env sh
+set -e
+
+# This script is run to update the OS and Compiler versions automatically.
+# It depends on the server-side making those requests idempotent.
+# This runs inside the docker container.
+
+. /etc/os-release
+OS_VERSION="$VERSION_ID"
+COMPILER_VERSION="$(gcc -dumpfullversion)"
+
+echo "OS: $OS_VERSION"
+echo "Compiler: $COMPILER_VERSION"
+
+if [ -n "$SECRET" ]; then
+  echo ./update_personality.pl \
+    --os-version="$OS_VERSION" \
+    --compiler-version="$COMPILER_VERSION" \
+    "$@"
+fi