diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b53e3dc5c6a..bb08a3bae2a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -81,7 +81,7 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update -qq
-        sudo apt-get install -y --no-install-recommends debootstrap
+        sudo apt-get install -y --no-install-recommends debootstrap erofs-utils
         [ ${{ inputs.compat-distro }} != devuan ] || curl https://git.devuan.org/devuan/debootstrap/raw/branch/master/scripts/ceres | sudo tee /usr/share/debootstrap/scripts/`echo ${{ inputs.compat-distro-version }} | sed s/64$//`
     - name: 1download
       timeout-minutes: 120
diff --git a/.github/workflows/dpup-kernel.yml b/.github/workflows/dpup-kernel.yml
index 20cfd723e9b..ec9d3019235 100644
--- a/.github/workflows/dpup-kernel.yml
+++ b/.github/workflows/dpup-kernel.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Free space
         run: sudo rm -rf /usr/local/lib/android /usr/share/dotnet # increase free space, we don't need these
       - name: Install dependencies
-        run: sudo apt-get update -qq && sudo apt-get install -y --no-install-recommends debootstrap
+        run: sudo apt-get update -qq && sudo apt-get install -y --no-install-recommends debootstrap erofs-utils
       - name: merge2out
         timeout-minutes: 5
         run: sudo -E ./merge2out woof-distro/${{ matrix.arch }}/debian/${{ matrix.release }}64
diff --git a/initrd-progs/0initrd/init b/initrd-progs/0initrd/init
index bd34f9b66e6..76ed3af9a6d 100755
--- a/initrd-progs/0initrd/init
+++ b/initrd-progs/0initrd/init
@@ -222,7 +222,7 @@ do_stack_onepupdrv() {
  losetup -r $ONE_LOOP $ONE_SFS
  SFS_MP="/pup_${ONE_SFX}"
  mkdir -p $SFS_MP
- mount -r -t squashfs -o noatime $ONE_LOOP $SFS_MP > /dev/console 2>&1
+ mount -r -t erofs,squashfs -o noatime $ONE_LOOP $SFS_MP > /dev/console 2>&1
  STATUS=$? ; check_status $STATUS
  [ $STATUS -eq 0 ] && ONE_LAYER="$SFS_MP=rr"
  # ======= end of load_sfs_file()
diff --git a/kernel-kit/README b/kernel-kit/README
index 354478fcfb4..525c40cc381 100644
--- a/kernel-kit/README
+++ b/kernel-kit/README
@@ -36,7 +36,7 @@ distro which is compatible with the target distro.
 
 REQUIRED:
 gcc - for compilation
-mksquashfs - for compressing the kernel source sfs, will build without
+erofs-utils - for compressing the kernel source sfs
 
 CREDIT
 ------
diff --git a/kernel-kit/build.sh b/kernel-kit/build.sh
index ecc1f44e35b..9a92d66ca5c 100755
--- a/kernel-kit/build.sh
+++ b/kernel-kit/build.sh
@@ -60,11 +60,11 @@ mkdir -p ${KBUILD_DIR}/usr/src/${KBUILD_DIR}
 mkdir -p ${KBUILD_DIR}/usr/lib/modules/${kernel_version}
 ln -s ../../../src/${KBUILD_DIR} ${KBUILD_DIR}/usr/lib/modules/${kernel_version}/build
 ln -s ../../../src/${KBUILD_DIR} ${KBUILD_DIR}/usr/lib/modules/${kernel_version}/source
-mksquashfs ${KBUILD_DIR} output/${KBUILD_DIR}.sfs ${SFSCOMP} || exit 1
+mkfs.erofs ${SFSCOMP} output/${KBUILD_DIR}.sfs ${KBUILD_DIR} || exit 1
 rm -rf ${KBUILD_DIR}
 
 KERNEL_MODULES_SFS_NAME="kernel-modules-${kernel_version}.sfs"
-mksquashfs output/linux_kernel-${kernel_version} output/${KERNEL_MODULES_SFS_NAME} ${SFSCOMP} || exit 1
+mkfs.erofs ${SFSCOMP} output/${KERNEL_MODULES_SFS_NAME} output/linux_kernel-${kernel_version} || exit 1
 rm -rf output/linux_kernel-${kernel_version}
 
 echo "Done!"
diff --git a/kernel-kit/debian-diffconfigs/trixie b/kernel-kit/debian-diffconfigs/trixie
index e7d5b9f41bd..d9b2eb277dc 100644
--- a/kernel-kit/debian-diffconfigs/trixie
+++ b/kernel-kit/debian-diffconfigs/trixie
@@ -12,6 +12,7 @@ CONFIG_CROS_EC_LPC=m
 CONFIG_CRYPTO_CTS=y
 CONFIG_CRYPTO_SHA512=y
 CONFIG_CRYPTO_XTS=y
+CONFIG_EROFS_FS=y
 CONFIG_EXFAT_FS=y
 CONFIG_EXT4_FS=y
 CONFIG_F2FS_FS=y
diff --git a/woof-code/3builddistro b/woof-code/3builddistro
index 5be72e49944..62980d49699 100755
--- a/woof-code/3builddistro
+++ b/woof-code/3builddistro
@@ -213,10 +213,10 @@ cp -f ../kernel-kit/output/vmlinuz-* build/vmlinuz
 cp -f ../kernel-kit/output/kbuild-*.sfs build/
 cp -f ../kernel-kit/output/kernel-modules-*.sfs build/${ZDRVSFS}
 
-mksquashfs fdrv build/${FDRVSFS} ${SFSCOMP}
-mksquashfs nlsx build/${NLSXSFS} ${SFSCOMP}
-mksquashfs docx build/${DOCXSFS} ${SFSCOMP}
-mksquashfs rootfs-complete build/${PUPPYSFS} ${SFSCOMP}
+mkfs.erofs ${SFSCOMP} build/${FDRVSFS} fdrv
+mkfs.erofs ${SFSCOMP} build/${NLSXSFS} nlsx
+mkfs.erofs ${SFSCOMP} build/${DOCXSFS} docx
+mkfs.erofs ${SFSCOMP} build/${PUPPYSFS} rootfs-complete
 
 WOOF_OUTPUT="woof-output-${DISTRO_FILE_PREFIX}-${DISTRO_VERSION}"
 mkdir -p ../${WOOF_OUTPUT}
diff --git a/woof-code/rootfs-skeleton/usr/local/sbin/sfs_load.overlay b/woof-code/rootfs-skeleton/usr/local/sbin/sfs_load.overlay
index dedef4d4444..2336492321e 100755
--- a/woof-code/rootfs-skeleton/usr/local/sbin/sfs_load.overlay
+++ b/woof-code/rootfs-skeleton/usr/local/sbin/sfs_load.overlay
@@ -139,7 +139,7 @@ if [ $# -ne 0 ]; then
 				[ $FOUND -eq 0 ] && exit 1
 
 				mkdir -p "$MNT" || continue
-				mount -r -t squashfs -o loop,noatime "$SFS" "$MNT"
+				mount -r -t erofs,squashfs -o loop,noatime "$SFS" "$MNT"
 				if [ $? -ne 0 ]; then
 					rmdir "$MNT"
 					continue
@@ -220,7 +220,7 @@ if [ $# -ne 0 ]; then
 		mkdir -p "$MNT"
 		mountpoint -q "$MNT"
 		if [ $? -ne 0 ]; then
-			mount -r -t squashfs -o loop,noatime "$SFS" "$MNT" || continue
+			mount -r -t erofs,squashfs -o loop,noatime "$SFS" "$MNT" || continue
 		fi
 
 		defaultfilemanager "$MNT" &
diff --git a/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/sfs_load.md b/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/sfs_load.md
index 45f14162e13..4957801f1a6 100644
--- a/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/sfs_load.md
+++ b/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/sfs_load.md
@@ -1,6 +1,6 @@
 # SFS Modules
 
-SFS modules are [Squashfs](https://docs.kernel.org/filesystems/squashfs.html) images containing a read-only directory hierarchy. DISTRO_NAME uses [overlayfs](https://docs.kernel.org/filesystems/overlayfs.html) to stack SFSs on top of each other and present their contents as a unified directory hierarchy.
+SFS modules are [EROFS](https://docs.kernel.org/filesystems/erofs.html) or [Squashfs](https://docs.kernel.org/filesystems/squashfs.html) images containing a read-only directory hierarchy. DISTRO_NAME uses [overlayfs](https://docs.kernel.org/filesystems/overlayfs.html) to stack SFSs on top of each other and present their contents as a unified directory hierarchy.
 
 ## Loading
 
@@ -39,10 +39,10 @@ Therefore, to control the stacking order of these SFSs, prefix their names with
 
 To create /tmp/app.sfs from /tmp/app:
 
-	mksquashfs /tmp/app /tmp/app.sfs -comp zstd -Xcompression-level 19 -b 256K -no-exports -no-xattrs
+	mkfs.erofs -x0 -zlz4hc,12 -C262144 /tmp/app.sfs /tmp/app
 
 To load app.sfs on startup, place it under the root (or `psubdir`, if set) of the save partition or boot partition.
 
 Once app.sfs is loaded, /tmp/app/usr/bin/a can be accessed through /usr/bin/a.
 
-See `man mksquashfs` for more SFS creation options.
+See `man mkfs.erofs` for more SFS creation options.
diff --git a/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/woof-CE.md b/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/woof-CE.md
index 8e237970687..ba010244021 100644
--- a/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/woof-CE.md
+++ b/woof-code/rootfs-skeleton/usr/local/share/doc/puppy/woof-CE.md
@@ -55,6 +55,7 @@ The goal is to build something similar to [DebianDog](https://debiandog.github.i
 ### Speed
 
 * The init script (/etc/rc.d/rc.sysinit) and the shutdown script (/etc/rc.d/rc.shutdown) are shorter and much faster.
+* SFSs can use [EROFS](https://docs.kernel.org/filesystems/erofs.html) instead of [Squashfs](https://docs.kernel.org/filesystems/squashfs.html) and all built-in SFSs use the former.
 * Caching of SFSs in RAM (`pfix=ram|copy` or automatic) happens in the background while the boot process continues.
 * 1download and 3builddistro are reimplemented using [debootstrap](https://wiki.debian.org/Debootstrap) and chroot environments. Build times are much shorter than upstream's and woof-CE itself is more portable.
 * `save2flash` is much faster because it preallocates space when files grow and only copies appended or modified blocks when files change.
@@ -122,7 +123,7 @@ The goal is to build something similar to [DebianDog](https://debiandog.github.i
 
 ## Usage
 
-	sudo apt-get install -y --no-install-recommends debootstrap squashfs-tools
+	sudo apt-get install -y --no-install-recommends debootstrap erofs-utils
 
 Then:
 
diff --git a/woof-distro/x86_64/debian/trixie64/DISTRO_PKGS_SPECS-debian-trixie b/woof-distro/x86_64/debian/trixie64/DISTRO_PKGS_SPECS-debian-trixie
index 6aff363ee11..90457d4261c 100644
--- a/woof-distro/x86_64/debian/trixie64/DISTRO_PKGS_SPECS-debian-trixie
+++ b/woof-distro/x86_64/debian/trixie64/DISTRO_PKGS_SPECS-debian-trixie
@@ -41,6 +41,7 @@ yes|desktop-file-utils|desktop-file-utils|exe,dev,doc,nls||deps:yes
 yes|dialog|dialog|exe,dev>null,doc,nls||deps:yes
 no|dkms|dkms|exe,dev>exe,doc,nls||deps:yes
 yes|dosfstools|dosfstools|exe,dev>null,doc,nls||deps:yes
+yes|erofs-utils|erofs-utils|exe,dev,doc,nls||deps:yes
 yes|exfatprogs|exfatprogs|exe,dev,doc,nls||deps:yes
 yes|f2fs-tools|f2fs-tools|exe,dev,doc,nls||deps:yes
 yes|gettext-base|gettext-base|exe,dev,doc,nls||deps:yes
@@ -67,7 +68,6 @@ yes|pipewire|pipewire-pulse,pipewire-alsa,libspa-0.2-bluetooth,libpipewire-0.3-d
 yes|pigz|pigz|exe,dev,doc,nls||deps:yes
 yes|procps|procps|exe,dev,doc,nls||deps:yes
 yes|psmisc|psmisc|exe,dev>null,doc,nls||deps:yes
-yes|squashfs-tools|squashfs-tools|exe,dev,doc,nls||deps:yes
 yes|udev|udev|exe,dev,doc,nls||deps:yes
 yes|wireless-regdb|wireless-regdb|exe,dev,doc,nls||deps:yes
 yes|wireplumber|wireplumber|exe,dev,doc,nls||deps:yes
diff --git a/woof-distro/x86_64/debian/trixie64/_00build.conf b/woof-distro/x86_64/debian/trixie64/_00build.conf
index d2ef5902199..a6e24b46109 100644
--- a/woof-distro/x86_64/debian/trixie64/_00build.conf
+++ b/woof-distro/x86_64/debian/trixie64/_00build.conf
@@ -18,8 +18,4 @@ fi
 [ "$DISTRO_VARIANT" != "barebones" ] && PETBUILDS="$PETBUILDS notification-daemon-stub mtpaint epdfview deadbeef gmeasures fpm2 xpad ExpenseTracker hardinfo gfnrename fsearch wly-colpick gplaces"
 
 ## compression method to be used (SFS files)
-#SFSCOMP='-comp xz -Xbcj x86 -b 512K'
-#SFSCOMP='-comp xz -Xbcj arm,armthumb -b 512K'
-#SFSCOMP='-comp gzip'
-#SFSCOMP='-noI -noD -noF -noX'
-SFSCOMP='-comp zstd -Xcompression-level 19 -b 256K -no-exports -no-xattrs'
+SFSCOMP='-x0 -zlz4hc,12 -C262144'