diff --git a/pkgs/os-specific/linux/firmware/linux-firmware/source.nix b/pkgs/os-specific/linux/firmware/linux-firmware/source.nix
index 01ea40a5089a643..4fcf64fae355305 100644
--- a/pkgs/os-specific/linux/firmware/linux-firmware/source.nix
+++ b/pkgs/os-specific/linux/firmware/linux-firmware/source.nix
@@ -1,6 +1,6 @@
 # This file is autogenerated! Run ./update.sh to regenerate.
 {
-  version = "20230625";
-  sourceHash = "sha256-olRaUVnCri/sJU6ob+QgNxEZF8GzVxxEh8zdNJIZlYY=";
-  outputHash = "sha256-zSlMpAPbW7ewEBzDre47/7NJyy2pC0GSbkyOVVi+4gU=";
+  version = "unstable-2023-07-24";
+  sourceHash = "sha256-WyO/+fxQljfo6OXLC8/BomGmKtUQaJ1Lt9V5Fdv172g=";
+  outputHash = "sha256-wHWPSyqxP+MGmerbc2v/hclFFJ7qKCDsupK5GASjp8s=";
 }
diff --git a/pkgs/os-specific/linux/firmware/linux-firmware/update.sh b/pkgs/os-specific/linux/firmware/linux-firmware/update.sh
index cd711db7de40141..0f11b7d069d1f3f 100755
--- a/pkgs/os-specific/linux/firmware/linux-firmware/update.sh
+++ b/pkgs/os-specific/linux/firmware/linux-firmware/update.sh
@@ -2,19 +2,24 @@
 set -euo pipefail
 cd "$(dirname "$(readlink -f "$0")")" || exit
 
-# step 1: figure out the latest version from the tags
 repo="https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git"
-latestTag="$(git ls-remote --refs --tags --sort refname "$repo" | tail -n1 | cut -f2 | cut -d '/' -f3)"
+
+# step 1: figure out the latest version from the tags
+if [ -z "${1:-}" ]; then
+  version="$(git ls-remote --refs --tags --sort refname "$repo" | tail -n1 | cut -f2 | cut -d '/' -f3)"
+else
+  version=$1
+fi
 
 # step 2: prefetch the source tarball
-snapshotUrl="$repo/snapshot/linux-firmware-$latestTag.tar.gz"
+snapshotUrl="$repo/snapshot/linux-firmware-$version.tar.gz"
 hash="$(nix-prefetch-url --unpack "$snapshotUrl")"
 sriHash="$(nix --experimental-features nix-command hash to-sri "sha256:$hash")"
 
 # step 3: rebuild as a non-FO derivation to get the right hash
 cat > source.nix << EOF
 {
-  version = "$latestTag";
+  version = "$version";
   sourceHash = "$sriHash";
   outputHash = null;
 }
@@ -27,7 +32,7 @@ outHash="$(nix --experimental-features nix-command hash path "$outPath")"
 cat > source.nix << EOF
 # This file is autogenerated! Run ./update.sh to regenerate.
 {
-  version = "$latestTag";
+  version = "$version";
   sourceHash = "$sriHash";
   outputHash = "$outHash";
 }