diff --git a/.github/workflows/os-real-boot.yml b/.github/workflows/os-real-boot.yml
index 24402de071..8419223876 100644
--- a/.github/workflows/os-real-boot.yml
+++ b/.github/workflows/os-real-boot.yml
@@ -62,6 +62,12 @@ jobs:
         with:
           fetch-depth: 1
 
+      - name: ArgosFS source pin preflight
+        shell: bash
+        run: |
+          set -euxo pipefail
+          scripts/ci/check-argosfs-source.sh
+
       - name: Install build and QEMU prerequisites
         shell: bash
         run: |
diff --git a/.github/workflows/os-sanity.yml b/.github/workflows/os-sanity.yml
index 8da80a1671..d48541baa5 100644
--- a/.github/workflows/os-sanity.yml
+++ b/.github/workflows/os-sanity.yml
@@ -26,6 +26,12 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: ArgosFS source pin preflight
+        shell: bash
+        run: |
+          set -euxo pipefail
+          scripts/ci/check-argosfs-source.sh
+
       - name: Install minimal prerequisites
         shell: bash
         run: |
diff --git a/package/utils/argosfs/Makefile b/package/utils/argosfs/Makefile
index f922726ec5..825eb36ae1 100644
--- a/package/utils/argosfs/Makefile
+++ b/package/utils/argosfs/Makefile
@@ -1,14 +1,16 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=argosfs
-PKG_VERSION:=0.1.0
-PKG_RELEASE:=6
+PKG_VERSION:=1.0.1
+PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/fwerkor/argosfs
-PKG_SOURCE_VERSION:=45e6a5c455c0068207eeeaceb945d7355487ede4
+# Current ArgosFS main HEAD after the v1.0.1 release. ArgosFS is developed for
+# CapOS; refresh this commit/hash when intentionally updating ArgosFS.
+PKG_SOURCE_VERSION:=0fd75b82295a161df302059bd06f2347a35b10a2
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_SOURCE_VERSION).tar.zst
-PKG_MIRROR_HASH:=1053038380bbb8f31fcc94d074f2128631dbd3b2d38ba561cebb06ffa1c696aa
+PKG_MIRROR_HASH:=249e415c344a826187844b79b12af413d487aba507a33a562ffd7ec700c5eb21
 
 PKG_MAINTAINER:=FWERKOR
 PKG_LICENSE:=Apache-2.0
diff --git a/scripts/ci/check-argosfs-source.sh b/scripts/ci/check-argosfs-source.sh
new file mode 100755
index 0000000000..f2d8bc4133
--- /dev/null
+++ b/scripts/ci/check-argosfs-source.sh
@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+makefile="${1:-package/utils/argosfs/Makefile}"
+
+read_make_var() {
+  local name="$1"
+  sed -n "s/^${name}:=//p" "$makefile" | head -n1
+}
+
+source_url="$(read_make_var PKG_SOURCE_URL)"
+source_version="$(read_make_var PKG_SOURCE_VERSION)"
+pkg_version="$(read_make_var PKG_VERSION)"
+release_tag="v${pkg_version}"
+
+if [[ -z "$source_url" || -z "$source_version" || -z "$pkg_version" ]]; then
+  echo "ERROR: unable to read ArgosFS source URL/version from $makefile" >&2
+  exit 1
+fi
+
+if [[ ! "$source_version" =~ ^[0-9a-f]{40}$ ]]; then
+  echo "ERROR: ArgosFS PKG_SOURCE_VERSION must be a full 40-character commit SHA" >&2
+  exit 1
+fi
+
+tmpdir="$(mktemp -d)"
+trap 'rm -rf "$tmpdir"' EXIT
+repo="$tmpdir/argosfs"
+mkdir -p "$repo"
+git -C "$repo" init -q
+
+fetched=0
+for attempt in 1 2 3; do
+  if git -C "$repo" fetch -q --depth=1 "$source_url" "refs/tags/$release_tag"; then
+    fetched=1
+    break
+  fi
+  echo "ArgosFS release tag fetch attempt $attempt failed" >&2
+  sleep "$attempt"
+done
+
+if [[ "$fetched" -ne 1 ]]; then
+  echo "ERROR: ArgosFS release tag $release_tag is not fetchable from $source_url" >&2
+  exit 1
+fi
+
+tag_commit="$(git -C "$repo" rev-parse 'FETCH_HEAD^{commit}')"
+if [[ "$tag_commit" != "$source_version" ]]; then
+  echo "ERROR: ArgosFS $release_tag resolves to $tag_commit, but CapOS pins $source_version" >&2
+  echo "Pin to the release commit so GitHub archive downloads remain reachable after branch history maintenance." >&2
+  exit 1
+fi
+
+git -C "$repo" cat-file -e 'FETCH_HEAD^{tree}'
+git -C "$repo" checkout -q --detach "$tag_commit"
+
+required_files=(
+  Cargo.toml
+  Cargo.lock
+  integrations/capos/initramfs/argosfs-root.sh
+  integrations/capos/initramfs/hooks/argosfs
+  integrations/capos/mkinitramfs/argosfs.conf
+  integrations/capos/systemd/argosfs-root.service
+  integrations/capos/systemd/argosfs-health.service
+  integrations/capos/systemd/argosfs-watchdog.service
+  integrations/capos/systemd/argosfs-recovery.target
+)
+
+for path in "${required_files[@]}"; do
+  if [[ ! -f "$repo/$path" ]]; then
+    echo "ERROR: pinned ArgosFS source is missing required file: $path" >&2
+    exit 1
+  fi
+done
+
+cargo_version="$(sed -n 's/^version = "\([^"]*\)"/\1/p' "$repo/Cargo.toml" | head -n1)"
+if [[ "$cargo_version" != "$pkg_version" ]]; then
+  echo "ERROR: CapOS ArgosFS PKG_VERSION=$pkg_version does not match upstream Cargo version=$cargo_version" >&2
+  exit 1
+fi
+
+echo "ArgosFS source preflight passed: $release_tag -> $source_version"