diff --git a/PKGBUILD b/PKGBUILD
index 07d3b9e..33879b5 100755
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -59,8 +59,8 @@ _subarch=
 _localmodcfg=

 pkgbase=linux-bcachefs-git
-_srcver_tag=5.1.15-arch1
-pkgver="${_srcver_tag//-/.}"
+_srcver_tag=5.1
+pkgver=v5.1.19
 pkgrel=1
 arch=(x86_64)
 url="https://github.com/koverstreet/bcachefs"
@@ -81,26 +81,27 @@ _repo_url="https://github.com/koverstreet/${_reponame}"
 _reponame_gcc_patch="kernel_gcc_patch"
 _repo_url_gcc_patch="https://github.com/graysky2/${_reponame_gcc_patch}"
 _gcc_patch_name="enable_additional_cpu_optimizations_for_gcc_v8.1+_kernel_v4.13+.patch"
+_repo_upstream="https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"

 _pkgdesc_extra="~ featuring Kent Overstreet's bcachefs filesystem"

 source=(
     "git+${_repo_url}"
     "git+${_repo_url_gcc_patch}"
+    "upstream::git+${_repo_upstream}"
     config         # the main kernel config file
     60-linux.hook  # pacman hook for depmod
     90-linux.hook  # pacman hook for initramfs regeneration
     linux.preset   # standard config files for mkinitcpio ramdisk
     001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by-default.patch
     002-ZEN-Add-CONFIG-for-unprivileged_userns_clone.patch
-    003-Bluetooth-Fix-minimum-encryption-key-size-check.patch
-
 )
 validpgpkeys=(
     'ABAF11C65A2970B130ABE3C479BE3E4300411886'    # Linus Torvalds
     '647F28654894E3BD457199BE38DBBDC86092693E'    # Greg Kroah-Hartman
 )
 sha512sums=('SKIP'
+            'SKIP'
             'SKIP'
             'f78db94e15ed4a5abca28238d2a315dcf13ff20e04694497275208b4aad18b1ded8b715bad546c623b0138747e6de4c070c28b5d3cc383bdd8b5959afc58294b'
             '7ad5be75ee422dda3b80edd2eb614d8a9181e2c8228cd68b3881e2fb95953bf2dea6cbe7900ce1013c9de89b2802574b7b24869fc5d7a95d3cc3112c4d27063a'
@@ -108,14 +109,23 @@ sha512sums=('SKIP'
             '2dc6b0ba8f7dbf19d2446c5c5f1823587de89f4e28e9595937dd51a87755099656f2acec50e3e2546ea633ad1bfd1c722e0c2b91eef1d609103d8abdc0a7cbaf'
             '6792e775464ba41b03938fd42d71caf22c85a4c63a255f5ff807da6101a42afe2f9cb940bd5e80b1e7d21a0b959962d90cc2452920597e7ba0bcb15d37c15233'
             'dc6321a572ac365f73b924b3bd8cd26112a0256baf358e3893b90a623e4c0a9eb3667b23f86570581371f993f2c17998e31e27aa36eee925a0589b20b71b65ff'
-            '2e9bc765b1761dc14fd924c6500bd16076991571692eb1dd9c84c10d92ce3cfc95e12aad503e64d9bbd2e3229a8d73e480d44e7713f958da36f2ac70e4820dd2')
+)

 _kernelname=${pkgbase#linux}
 : ${_kernelname:=-ARCH}

-prepare() {
+pkgver() {
+  cd upstream
+  git fetch --tags &> /dev/null
+  _srcver_tag=$(git tag | grep v${_srcver_tag} | grep -v '-' | sort -t. -k 1,1n -k 2,2n -k 3,3n | tail -n1)
+  echo "${_srcver_tag//-/.}"
+}
+
+actual_prepare() {
+#prepare() {
     cd ${_reponame}

+    msg2 "Latest tag found: ${pkgver}"
     msg2 "Setting version..."
     scripts/setlocalversion --save-scmversion
     echo "-$pkgrel" > localversion.10-pkgrel
@@ -126,19 +136,28 @@ prepare() {
     # git pull --no-edit arch_stable "v${_srcver_tag}"

     # msg2 "Adding patches from Linux upstream kernel repository..."
-    git remote add upstream_stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git || true
-    git pull --no-edit upstream_stable v"${_srcver_tag//-arch*/}"
+    git remote add upstream ../upstream || true
+    git fetch --tags upstream
+    if ! git merge v${_srcver_tag}
+      then if ! git diff --name-only --diff-filter=U | xargs git checkout --theirs
+        then git diff --name-only --diff-filter=U |
+        while read line
+        do sleep 0.1; if ! git checkout --theirs $line
+          then sleep 0.1; git rm $line
+          fi
+        done
+      fi
+    fi

     msg2 "Arch patches"
     patch -Np1 -i "${srcdir}/001-add-sysctl-to-disallow-unprivileged-CLONE_NEWUSER-by-default.patch"
     patch -Np1 -i "${srcdir}/002-ZEN-Add-CONFIG-for-unprivileged_userns_clone.patch"
-    patch -Np1 -i "${srcdir}/003-Bluetooth-Fix-minimum-encryption-key-size-check.patch"
-    sed -i -e "s/^EXTRAVERSION =.*/EXTRAVERSION = -arch1/" Makefile
+#    sed -i -e "s/^EXTRAVERSION =.*/EXTRAVERSION = -arch1/" Makefile

     # https://github.com/graysky2/kernel_gcc_patch
     msg2 "Patching to enabled additional gcc CPU optimizatons..."
     patch -Np1 -i "$srcdir/${_reponame_gcc_patch}/${_gcc_patch_name}"
-
+
     msg2 "Setting config..."
     cp ../config .config

@@ -174,8 +193,8 @@ prepare() {
 }

 build() {
+    ( actual_prepare )
     cd ${_reponame}
-
     make bzImage modules
 }