diff --git a/.github/workflows/codeql-verification.yml b/.github/workflows/codeql-verification.yml
index 99356c1..d8ead21 100644
--- a/.github/workflows/codeql-verification.yml
+++ b/.github/workflows/codeql-verification.yml
@@ -35,12 +35,12 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          archive="$RUNNER_TEMP/go1.27.0.linux-amd64.tar.gz"
+          archive="$RUNNER_TEMP/go1.27.3.linux-amd64.tar.gz"
           curl --fail --silent --show-error --location \
             --output "$archive" \
-            'https://go.dev/dl/go1.27.0.linux-amd64.tar.gz'
+            'https://go.dev/dl/go1.27.3.linux-amd64.tar.gz'
           printf '%s  %s\n' \
-            '675c26c449cbb18fc24b74650de1eabbae6e16f64326fd85a283fb3b58280685' \
+            '65efbc80fdc1fa2cd2631cad5b481777a68e8725f34e89f50fc6ac714e379b40' \
             "$archive" | sha256sum --check
           tar -C "$RUNNER_TEMP" -xzf "$archive"
           "$RUNNER_TEMP/go/bin/go" version
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..24d858f
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,65 @@
+name: Publish verified immutable runtime
+on:
+  workflow_dispatch:
+    inputs:
+      producer_run:
+        description: Successful exact-source security gate run
+        required: true
+        type: string
+permissions:
+  contents: write
+  actions: read
+  packages: write
+jobs:
+  publish:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    env:
+      GH_TOKEN: ${{ github.token }}
+      PRODUCER_RUN: ${{ inputs.producer_run }}
+      RELEASE_TAG: v0.7.3
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: v0.7.3
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Verify immutable tag and successful producer
+        shell: bash
+        run: |
+          set -euo pipefail
+          [[ "$PRODUCER_RUN" =~ ^[0-9]+$ ]]
+          test "$(git cat-file -t "refs/tags/$RELEASE_TAG")" = tag
+          test "$(git rev-parse HEAD)" = "$(git rev-parse "refs/tags/$RELEASE_TAG^{}")"
+          gh api "repos/$GITHUB_REPOSITORY/actions/runs/$PRODUCER_RUN" > "$RUNNER_TEMP/producer.json"
+          jq -e '.status == "completed" and .conclusion == "success" and .path == ".github/workflows/security-release-gate.yml"' "$RUNNER_TEMP/producer.json"
+          source=$(jq -r .head_sha "$RUNNER_TEMP/producer.json")
+          [[ "$source" =~ ^[0-9a-f]{40}$ ]]
+          tree=$(gh api "repos/$GITHUB_REPOSITORY/commits/$source" --jq .commit.tree.sha)
+          test "$tree" = "$(git rev-parse 'HEAD^{tree}')"
+          gh run download "$PRODUCER_RUN" --repo "$GITHUB_REPOSITORY" --name "security-runtime-$source" --dir dist/security-runtime
+          test "$(cat dist/security-runtime/source-revision.txt)" = "$source"
+          (cd dist/security-runtime && sha256sum --check SHA256SUMS)
+      - name: Publish exact scanned image and release assets
+        shell: bash
+        run: |
+          set -euo pipefail
+          gzip -dc dist/security-runtime/images.tar.gz | docker load
+          printf '%s' "$GH_TOKEN" | docker login ghcr.io -u "$GITHUB_ACTOR" --password-stdin
+          trap 'docker logout ghcr.io >/dev/null 2>&1 || true' EXIT
+          source_image='pasturestack/kubernetes-agent:v0.7.3'
+          remote_image="ghcr.io/pasturestack/kubernetes-agent:$RELEASE_TAG"
+          if docker manifest inspect "$remote_image" >/dev/null 2>"$RUNNER_TEMP/manifest-error"; then
+            echo "Refusing to replace an existing immutable image tag: $remote_image" >&2; exit 1
+          else
+            grep -Eq 'manifest unknown|no such manifest' "$RUNNER_TEMP/manifest-error"
+          fi
+          docker tag "$source_image" "$remote_image"
+          docker push "$remote_image" | tee "$RUNNER_TEMP/push-log"
+          pushed=$(awk '/digest: sha256:/{for(i=1;i<=NF;i++) if($i=="digest:") print $(i+1)}' "$RUNNER_TEMP/push-log")
+          readback=$(docker buildx imagetools inspect "$remote_image" | awk '$1=="Digest:"{print $2; exit}')
+          test "$pushed" = "$readback"
+          [[ "$readback" =~ ^sha256:[0-9a-f]{64}$ ]]
+          source=$(cat dist/security-runtime/source-revision.txt)
+          jq -n --arg image "$remote_image" --arg digest "$readback" --arg source "$source" '{image:$image,digest:$digest,source:$source}' > dist/security-runtime/registry-images.json
+          gh release create "$RELEASE_TAG" --repo "$GITHUB_REPOSITORY" --verify-tag --title "$GITHUB_REPOSITORY $RELEASE_TAG" --notes "Exact tested and scanned producer $source, run $PRODUCER_RUN. The immutable release tag has the same source tree. No deployment." dist/security-runtime/*
diff --git a/.github/workflows/security-release-gate.yml b/.github/workflows/security-release-gate.yml
index 41f6054..6fe7548 100644
--- a/.github/workflows/security-release-gate.yml
+++ b/.github/workflows/security-release-gate.yml
@@ -52,12 +52,12 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          archive="$RUNNER_TEMP/go1.27.0.linux-amd64.tar.gz"
+          archive="$RUNNER_TEMP/go1.27.3.linux-amd64.tar.gz"
           curl --fail --silent --show-error --location \
             --output "$archive" \
-            'https://go.dev/dl/go1.27.0.linux-amd64.tar.gz'
+            'https://go.dev/dl/go1.27.3.linux-amd64.tar.gz'
           printf '%s  %s\n' \
-            '675c26c449cbb18fc24b74650de1eabbae6e16f64326fd85a283fb3b58280685' \
+            '65efbc80fdc1fa2cd2631cad5b481777a68e8725f34e89f50fc6ac714e379b40' \
             "$archive" | sha256sum --check
           tar -C "$RUNNER_TEMP" -xzf "$archive"
           "$RUNNER_TEMP/go/bin/go" version
@@ -97,7 +97,11 @@ jobs:
             go test -mod=mod -race -count=1 ./...
           )
           (
-            cd third_party/go-rancher-metadata
+            cd third_party/platform-metadata-client
+            go test -mod=mod -race -count=1 ./...
+          )
+          (
+            cd third_party/control-api-client
             go test -mod=mod -race -count=1 ./...
           )
 
@@ -308,6 +312,24 @@ jobs:
           jq -e '.passed == true and .kubernetes == "1.36.4" and .clientGo == "0.36.4"' \
             dist/kubernetes-integration.json >/dev/null
 
+      - name: Retain exact runtime for immutable release
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p dist/security-runtime
+          docker image inspect "$IMAGE" > dist/security-runtime/images.json
+          docker save "$IMAGE" | gzip -n > dist/security-runtime/images.tar.gz
+          cp dist/runtime-scan.json dist/runtime-sbom.cdx.json dist/security-runtime/
+          printf '%s\n' "$GITHUB_SHA" > dist/security-runtime/source-revision.txt
+          (cd dist/security-runtime && sha256sum -- * > SHA256SUMS)
+      - name: Upload exact runtime release bytes
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: security-runtime-${{ github.sha }}
+          path: dist/security-runtime/
+          if-no-files-found: error
+          retention-days: 14
+
       - name: Remove verification-only images and cache
         if: always()
         shell: bash
diff --git a/Dockerfile.dapper b/Dockerfile.dapper
index 2a28843..845c857 100644
--- a/Dockerfile.dapper
+++ b/Dockerfile.dapper
@@ -1,15 +1,17 @@
-FROM docker:29.7.2-cli@sha256:000bb62ff495f986c9f5578eb67cc2cb98b91138eda81d7762d5371eb8a497fe AS snapshot-ca-certificates
+FROM docker:29.9.2-cli@sha256:000bb62ff495f986c9f5578eb67cc2cb98b91138eda81d7762d5371eb8a497fe AS snapshot-ca-certificates
 
 FROM ubuntu:26.04@sha256:2260313b31c8c011cd2eebe728008efac1b3982be73eb71348ea2648d2c0e09b
 
 COPY --from=snapshot-ca-certificates /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY package/ubuntu-apt.lock /licenses/ubuntu-apt.lock
+COPY package/ubuntu-security-packages.lock /licenses/ubuntu-security-packages.lock
+COPY scripts/install-ubuntu-security-updates /usr/local/bin/install-ubuntu-security-updates
 
 ARG DAPPER_HOST_ARCH=amd64
-ARG DOCKER_VERSION=29.7.2
-ARG DOCKER_LINUX_AMD64_SHA256=803d433f226db4776e1768fd319fc6c6e4935a456acf84fcc0080818b854bc8f
-ARG GO_VERSION=1.27.0
-ARG GO_LINUX_AMD64_SHA256=675c26c449cbb18fc24b74650de1eabbae6e16f64326fd85a283fb3b58280685
+ARG DOCKER_VERSION=29.9.2
+ARG DOCKER_LINUX_AMD64_SHA256=9ac225999fd5e863f7694c728ef23d480616b1e5639328fa309befd4243d69eb
+ARG GO_VERSION=1.27.3
+ARG GO_LINUX_AMD64_SHA256=65efbc80fdc1fa2cd2631cad5b481777a68e8725f34e89f50fc6ac714e379b40
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV HOST_ARCH=${DAPPER_HOST_ARCH} \
@@ -18,6 +20,7 @@ ENV HOST_ARCH=${DAPPER_HOST_ARCH} \
     SHELL=/bin/bash \
     GOTOOLCHAIN=local
 
+ADD --checksum=sha256:5b6326f1932cfd7be57130561dc78192f09ed9f58bfbe6606ed0c50510c3b6cd https://archive.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20260816ubuntu0.26.04.1_all.deb /opt/pasturestack-ca-certificates.deb
 RUN set -eux; \
     . /licenses/ubuntu-apt.lock; \
     find /etc/apt -type f \( -name '*.list' -o -name '*.sources' \) -exec sed -i \
@@ -27,12 +30,18 @@ RUN set -eux; \
     apt-get --snapshot "${UBUNTU_APT_SNAPSHOT}" update; \
     apt-get --snapshot "${UBUNTU_APT_SNAPSHOT}" install -y --no-install-recommends \
         bash="${UBUNTU_APT_BASH_VERSION}" \
-        ca-certificates="${UBUNTU_APT_CA_CERTIFICATES_VERSION}" \
+        ca-certificates="${UBUNTU_APT_CA_CERTIFICATES_BOOTSTRAP_VERSION}" \
         curl="${UBUNTU_APT_CURL_VERSION}" \
         git="${UBUNTU_APT_GIT_VERSION}" \
         jq="${UBUNTU_APT_JQ_VERSION}" \
         tar="${UBUNTU_APT_TAR_VERSION}" \
         xz-utils="${UBUNTU_APT_XZ_UTILS_VERSION}"; \
+    dpkg -i /opt/pasturestack-ca-certificates.deb && \
+    update-ca-certificates --fresh && \
+    test "$(dpkg-query -W -f='${Version}' ca-certificates)" = '20260816ubuntu0.26.04.1' && \
+    test ! -e /usr/share/ca-certificates/mozilla/emSign_ECC_Root_CA_-_G3.crt && \
+    rm -f /opt/pasturestack-ca-certificates.deb && \
+    sh /usr/local/bin/install-ubuntu-security-updates /licenses/ubuntu-security-packages.lock /etc/ssl/certs/ca-certificates.crt && \
     { \
         printf 'snapshot\t%s\n' "${UBUNTU_APT_SNAPSHOT}"; \
         dpkg-query -W -f='${binary:Package}\t${Version}\n' | LC_ALL=C sort; \
diff --git a/Makefile b/Makefile
index 0c3512e..45a4f5f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,8 @@
 TARGETS := $(shell ls scripts)
 
-DAPPER_IMAGE ?= pasturestack-kubernetes-agent-dapper:go1.27.0
+DAPPER_IMAGE ?= pasturestack-kubernetes-agent-dapper:go1.27.3
 DAPPER_HOST_ARCH ?= amd64
-DOCKER_VERSION ?= 29.7.2
+DOCKER_VERSION ?= 29.9.2
 
 .PHONY: $(TARGETS) deps trash trash-keep dapper-image
 
diff --git a/README.md b/README.md
index 7a4a661..039913e 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ PastureStack is an independent community effort to preserve, audit, and moderniz
 
 ## Project status
 
-Candidate `0.7.3` uses Go 1.27.0, Go modules, client-go 0.36.4, and logrus 1.10.1 while
+Candidate `0.7.3` uses Go 1.27.3, Go modules, client-go 0.36.4, and logrus 1.10.1 while
 retaining the established event and Kubernetes API contracts. Kubernetes 1.36.4
 is the supported and tested API line. Its runtime is a
 digest-pinned distroless image that runs as UID/GID 65532. Source, runtime, and
@@ -48,3 +48,7 @@ change a catalog. See [COMPATIBILITY.md](COMPATIBILITY.md),
 ## License and attribution
 
 The inherited project remains licensed under [Apache License 2.0](LICENSE). Copyright and attribution for inherited work and vendored dependencies remain with their respective authors and contributors. PastureStack contributors claim authorship only for their own changes.
+
+## October 2026 security maintenance
+
+Maintained Go builds select the patched Go 1.27.3 compiler without raising the existing Go language requirement. Ubuntu build/runtime stages apply the checksum-pinned `ca-certificates 20260816ubuntu0.26.04.1` security package after their frozen APT baseline; the final trust store and installed version are verified. Release artifacts must pass the repository's existing checks before publication.
diff --git a/go.mod b/go.mod
index ca87b92..32267db 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/PastureStack/kubernetes-agent
 
 go 1.26.0
 
-toolchain go1.27.0
+toolchain go1.27.3
 
 require (
 	github.com/PastureStack/control-api-client v0.0.0
@@ -53,11 +53,11 @@ require (
 	github.com/x448/float16 v0.8.4 // indirect
 	go.yaml.in/yaml/v2 v2.4.4 // indirect
 	go.yaml.in/yaml/v3 v3.0.5 // indirect
-	golang.org/x/net v0.58.0 // indirect
+	golang.org/x/net v0.60.0 // indirect
 	golang.org/x/oauth2 v0.36.0 // indirect
-	golang.org/x/sys v0.47.0 // indirect
-	golang.org/x/term v0.45.0 // indirect
-	golang.org/x/text v0.41.0 // indirect
+	golang.org/x/sys v0.48.0 // indirect
+	golang.org/x/term v0.46.0 // indirect
+	golang.org/x/text v0.42.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
 	google.golang.org/protobuf v1.36.12 // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
diff --git a/go.sum b/go.sum
index 4665af7..3c715e2 100644
--- a/go.sum
+++ b/go.sum
@@ -109,16 +109,16 @@ go.yaml.in/yaml/v2 v2.4.4 h1:tuyd0P+2Ont/d6e2rl3be67goVK4R6deVxCUX5vyPaQ=
 go.yaml.in/yaml/v2 v2.4.4/go.mod h1:gMZqIpDtDqOfM0uNfy0SkpRhvUryYH0Z6wdMYcacYXQ=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
-golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
-golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
+golang.org/x/net v0.60.0 h1:79p50tfZlm0J9YfoDsSi639qSXNGVwEzOPLCxM2FsYU=
+golang.org/x/net v0.60.0/go.mod h1:2DA/G1UfVbCpQPeWTmMPGY7Cs2PkBkwu743bVX5PIVg=
 golang.org/x/oauth2 v0.36.0 h1:peZ/1z27fi9hUOFCAZaHyrpWG5lwe0RJEEEeH0ThlIs=
 golang.org/x/oauth2 v0.36.0/go.mod h1:YDBUJMTkDnJS+A4BP4eZBjCqtokkg1hODuPjwiGPO7Q=
-golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
-golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
-golang.org/x/term v0.45.0 h1:NwWyBmoJCbfTHpxrWoZ9C6/VxOf7ic219I8xZZFdrf0=
-golang.org/x/term v0.45.0/go.mod h1:9aqxs0blBcrm/n0L9QW0aRVD+ktan8ssZromtqJC43w=
-golang.org/x/text v0.41.0 h1:vz/seA0lnX87Othu2f/0L24RcgrXD9/YFTSuGjj3rH8=
-golang.org/x/text v0.41.0/go.mod h1:jvf1O8ajNzZqhSrQBPbutR/EB83Cc0CFrezNQIwbb5M=
+golang.org/x/sys v0.48.0 h1:bbX/i/6MgT9BVLM9RT1thmxL04yeTAhbEz4SyadbXoo=
+golang.org/x/sys v0.48.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
+golang.org/x/term v0.46.0 h1:3+OXuTbaKDgwk8jTi3aSLHRlmWqHEUDUtxnbFigO4YE=
+golang.org/x/term v0.46.0/go.mod h1:+K02xbkittuwc0Am4abfA3Fc+XRGXkvBXNO88NCXPoc=
+golang.org/x/text v0.42.0 h1:JbOZXgfeCPU9gacVtYliJqOhD+zhrEqK4LfdpmlUZqI=
+golang.org/x/text v0.42.0/go.mod h1:ojzP1Z+2QtioaF8DTtO8K5q7JWVVYwZKenzujK0Zd0E=
 golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
 golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
 google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
diff --git a/package/ubuntu-apt.lock b/package/ubuntu-apt.lock
index abde4c3..e341215 100644
--- a/package/ubuntu-apt.lock
+++ b/package/ubuntu-apt.lock
@@ -4,7 +4,9 @@
 UBUNTU_APT_SNAPSHOT='20260808T000000Z'
 
 UBUNTU_APT_BASH_VERSION='5.3-2ubuntu1'
-UBUNTU_APT_CA_CERTIFICATES_VERSION='20260601~26.04.1'
+# Frozen APT baseline; the checksum-pinned security overlay below is the final installed CA.
+UBUNTU_APT_CA_CERTIFICATES_BOOTSTRAP_VERSION='20260601~26.04.1'
+UBUNTU_APT_CA_CERTIFICATES_VERSION='20260816ubuntu0.26.04.1'
 UBUNTU_APT_CURL_VERSION='8.18.0-1ubuntu2.3'
 UBUNTU_APT_GIT_VERSION='1:2.53.0-1ubuntu1'
 UBUNTU_APT_JQ_VERSION='1.8.1-4ubuntu2'
diff --git a/package/ubuntu-security-packages.lock b/package/ubuntu-security-packages.lock
new file mode 100644
index 0000000..b0dfc09
--- /dev/null
+++ b/package/ubuntu-security-packages.lock
@@ -0,0 +1,34 @@
+# Official Ubuntu 26.04 security/updates snapshot: 20261023T000000Z
+# Existing packages only; ABI series and unrelated packages are preserved.
+bsdutils=1:2.41.3-3ubuntu2.2
+curl=8.18.0-1ubuntu2.8
+diffutils=1:3.12-1ubuntu0.1
+gnu-coreutils=9.7-3ubuntu2.1
+gpgv=2.4.8-4ubuntu3.1
+libattr1=1:2.5.2-4ubuntu0.1
+libblkid1=2.41.3-3ubuntu2.2
+libbz2-1.0=1.0.8-6ubuntu0.1
+libc-bin=2.43-2ubuntu2.4
+libc-gconv-modules-extra=2.43-2ubuntu2.4
+libc6=2.43-2ubuntu2.4
+libc6-dev=2.43-2ubuntu2.4
+libc-dev-bin=2.43-2ubuntu2.4
+libexpat1=2.7.4-1ubuntu0.2
+libcurl4t64=8.18.0-1ubuntu2.8
+libgcrypt20=1.12.0-2ubuntu1.1
+libmount1=2.41.3-3ubuntu2.2
+libperl5.40=5.40.1-7ubuntu0.3
+libsmartcols1=2.41.3-3ubuntu2.2
+libssh2-1t64=1.11.1-1ubuntu0.26.04.4
+libssl3t64=3.5.5-1ubuntu3.7
+libuuid1=2.41.3-3ubuntu2.2
+linux-libc-dev=7.0.0-38.38
+login=1:4.16.0-2+really2.41.3-3ubuntu2.2
+mount=2.41.3-3ubuntu2.2
+openssl=3.5.5-1ubuntu3.7
+openssl-provider-legacy=3.5.5-1ubuntu3.7
+perl=5.40.1-7ubuntu0.3
+perl-base=5.40.1-7ubuntu0.3
+perl-modules-5.40=5.40.1-7ubuntu0.3
+util-linux=2.41.3-3ubuntu2.2
+zlib1g=1:1.3.dfsg+really1.3.1-1ubuntu3.2
diff --git a/scripts/install-ubuntu-security-updates b/scripts/install-ubuntu-security-updates
new file mode 100644
index 0000000..a8630dd
--- /dev/null
+++ b/scripts/install-ubuntu-security-updates
@@ -0,0 +1,54 @@
+#!/bin/sh
+# Same-series official micro-updates. Never install a package just for a scan.
+set -eu
+test "$#" -eq 2 || { echo 'usage: security-updates LOCK TRUSTED_CA_BUNDLE' >&2; exit 2; }
+lock=$1
+trusted_ca=$2
+. /etc/os-release
+test "$ID:$VERSION_ID" = ubuntu:26.04
+test -s "$lock"
+test -s "$trusted_ca"
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT HUP INT TERM
+dpkg-query -W -f='${binary:Package}\t${db:Status-Status}\n' | LC_ALL=C sort > "$tmp/before"
+set --
+while IFS= read -r entry || test -n "$entry"; do
+    case "$entry" in ''|'#'*) continue;; esac
+    case "$entry" in *[!a-zA-Z0-9.:+~=_-]*) echo "Invalid lock entry" >&2; exit 1;; esac
+    package=${entry%%=*}
+    version=${entry#*=}
+    test "$package" != "$version"
+    status=$(dpkg-query -W -f='${db:Status-Status}' "$package" 2>/dev/null || true)
+    test "$status" = installed || continue
+    installed=$(dpkg-query -W -f='${Version}' "$package")
+    # A newer base may already contain the fix; never downgrade it.
+    dpkg --compare-versions "$installed" ge "$version" && continue
+    set -- "$@" "$entry"
+done < "$lock"
+if test "$#" -gt 0; then
+    mkdir -p "$tmp/lists/partial"
+    printf 'Types: deb\nURIs: https://snapshot.ubuntu.com/ubuntu/20261023T000000Z\nSuites: resolute-updates resolute-security\nComponents: main\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\nSnapshot: no\n' > "$tmp/security.sources"
+    apt_security() {
+        apt-get -o Dir::Etc::sourcelist="$tmp/security.sources" \
+            -o Dir::State::lists="$tmp/lists" \
+            -o Dir::Cache::pkgcache="$tmp/pkgcache.bin" -o Dir::Cache::srcpkgcache="$tmp/srcpkgcache.bin" \
+            -o Dir::Etc::sourceparts=- -o Acquire::https::CaInfo="$trusted_ca" \
+            -o Acquire::https::Verify-Peer=true -o Acquire::https::Verify-Host=true \
+            -o Acquire::AllowInsecureRepositories=false -o APT::Get::AllowUnauthenticated=false \
+            -o Acquire::Retries=5 "$@"
+    }
+    apt_security update
+    DEBIAN_FRONTEND=noninteractive apt_security install -y --only-upgrade --no-install-recommends --no-remove "$@"
+fi
+while IFS= read -r entry || test -n "$entry"; do
+    case "$entry" in ''|'#'*) continue;; esac
+    package=${entry%%=*}
+    version=${entry#*=}
+    status=$(dpkg-query -W -f='${db:Status-Status}' "$package" 2>/dev/null || true)
+    test "$status" = installed || continue
+    dpkg --compare-versions "$(dpkg-query -W -f='${Version}' "$package")" ge "$version"
+done < "$lock"
+dpkg-query -W -f='${binary:Package}\t${db:Status-Status}\n' | LC_ALL=C sort > "$tmp/after"
+# A security micro-update must not add/remove packages or change installed status.
+cmp "$tmp/before" "$tmp/after"
+printf 'UBUNTU_SECURITY_MICRO_UPDATES_OK\n'
diff --git a/scripts/validate b/scripts/validate
index 858748e..890d8ff 100755
--- a/scripts/validate
+++ b/scripts/validate
@@ -31,13 +31,13 @@ fi
 
 required_markers=(
     'go 1.26.0'
-    'toolchain go1.27.0'
-    'FROM docker:29.7.2-cli@sha256:000bb62ff495f986c9f5578eb67cc2cb98b91138eda81d7762d5371eb8a497fe AS snapshot-ca-certificates'
+    'toolchain go1.27.3'
+    'FROM docker:29.9.2-cli@sha256:000bb62ff495f986c9f5578eb67cc2cb98b91138eda81d7762d5371eb8a497fe AS snapshot-ca-certificates'
     'FROM ubuntu:26.04@sha256:2260313b31c8c011cd2eebe728008efac1b3982be73eb71348ea2648d2c0e09b'
     "UBUNTU_APT_SNAPSHOT='20260808T000000Z'"
     'apt-get --snapshot "${UBUNTU_APT_SNAPSHOT}" update'
-    'GO_VERSION=1.27.0'
-    'DOCKER_VERSION=29.7.2'
+    'GO_VERSION=1.27.3'
+    'DOCKER_VERSION=29.9.2'
     'FROM gcr.io/distroless/static-debian12@sha256:4b2a093ef4649bccd586625090a3c668b254cfe180dee54f4c94f3e9bd7e381e'
     'USER 65532:65532'
     'org.opencontainers.image.revision="${SOURCE_REVISION}"'
@@ -134,8 +134,8 @@ fi
 codeql_workflow=.github/workflows/codeql-verification.yml
 for marker in \
     "'verification/kubernetes-agent-*'" \
-    'github/codeql-action/init@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7' \
-    'github/codeql-action/analyze@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7' \
+    'github/codeql-action/init@db488ddef3bf6cb639b32c2e9a7c0a7ea8271d28 # v4.37.8' \
+    'github/codeql-action/analyze@db488ddef3bf6cb639b32c2e9a7c0a7ea8271d28 # v4.37.8' \
     'build-mode: manual' \
     'upload: never' \
     'codeql_critical_high' \
diff --git a/third_party/control-api-client/go.mod b/third_party/control-api-client/go.mod
index 4a35c14..6dec477 100644
--- a/third_party/control-api-client/go.mod
+++ b/third_party/control-api-client/go.mod
@@ -2,8 +2,8 @@ module github.com/PastureStack/control-api-client
 
 go 1.26.0
 
-toolchain go1.27.0
+toolchain go1.27.3
 
 require github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674
 
-require golang.org/x/net v0.58.0 // indirect
+require golang.org/x/net v0.60.0 // indirect
diff --git a/third_party/control-api-client/go.sum b/third_party/control-api-client/go.sum
index ab25fde..3e23792 100644
--- a/third_party/control-api-client/go.sum
+++ b/third_party/control-api-client/go.sum
@@ -1,4 +1,4 @@
 github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 h1:JeSE6pjso5THxAzdVpqr6/geYxZytqFMBCOtn/ujyeo=
 github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674/go.mod h1:r4w70xmWCQKmi1ONH4KIaBptdivuRPyosB9RmPlGEwA=
-golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
-golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
+golang.org/x/net v0.60.0 h1:79p50tfZlm0J9YfoDsSi639qSXNGVwEzOPLCxM2FsYU=
+golang.org/x/net v0.60.0/go.mod h1:2DA/G1UfVbCpQPeWTmMPGY7Cs2PkBkwu743bVX5PIVg=
diff --git a/third_party/event-subscriber/go.mod b/third_party/event-subscriber/go.mod
index b0f891e..1b16857 100644
--- a/third_party/event-subscriber/go.mod
+++ b/third_party/event-subscriber/go.mod
@@ -2,7 +2,7 @@ module github.com/PastureStack/event-subscriber
 
 go 1.26.0
 
-toolchain go1.27.0
+toolchain go1.27.3
 
 require (
 	github.com/PastureStack/control-api-client v0.0.0
@@ -11,8 +11,8 @@ require (
 )
 
 require (
-	golang.org/x/net v0.58.0 // indirect
-	golang.org/x/sys v0.47.0 // indirect
+	golang.org/x/net v0.60.0 // indirect
+	golang.org/x/sys v0.48.0 // indirect
 )
 
 replace github.com/PastureStack/control-api-client => ../control-api-client
diff --git a/third_party/event-subscriber/go.sum b/third_party/event-subscriber/go.sum
index 89bed0f..bb23846 100644
--- a/third_party/event-subscriber/go.sum
+++ b/third_party/event-subscriber/go.sum
@@ -6,7 +6,7 @@ github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWD
 github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
-golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
-golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
-golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
-golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/net v0.60.0 h1:79p50tfZlm0J9YfoDsSi639qSXNGVwEzOPLCxM2FsYU=
+golang.org/x/net v0.60.0/go.mod h1:2DA/G1UfVbCpQPeWTmMPGY7Cs2PkBkwu743bVX5PIVg=
+golang.org/x/sys v0.48.0 h1:bbX/i/6MgT9BVLM9RT1thmxL04yeTAhbEz4SyadbXoo=
+golang.org/x/sys v0.48.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
diff --git a/third_party/platform-metadata-client/go.mod b/third_party/platform-metadata-client/go.mod
index d01f4bf..adf3b24 100644
--- a/third_party/platform-metadata-client/go.mod
+++ b/third_party/platform-metadata-client/go.mod
@@ -2,7 +2,7 @@ module github.com/PastureStack/platform-metadata-client
 
 go 1.26.0
 
-toolchain go1.27.0
+toolchain go1.27.3
 
 require github.com/sirupsen/logrus v1.10.2