diff --git a/conf/distro/cip-core-buster.conf b/conf/distro/cip-core-buster.conf
index c5cb39c..ef60d24 100644
--- a/conf/distro/cip-core-buster.conf
+++ b/conf/distro/cip-core-buster.conf
@@ -12,5 +12,7 @@
 require conf/distro/debian-buster.conf
 require cip-core-common.inc
 
+DISTRO_APT_SOURCES = "conf/distro/debian-buster.list"
+
 PREFERRED_VERSION_linux-cip ?= "4.19.%"
 PREFERRED_VERSION_linux-cip-rt ?= "4.19.%"
diff --git a/conf/distro/cip-core-stretch.conf b/conf/distro/cip-core-stretch.conf
index 31900fa..ad185dd 100644
--- a/conf/distro/cip-core-stretch.conf
+++ b/conf/distro/cip-core-stretch.conf
@@ -12,5 +12,7 @@
 require conf/distro/debian-stretch.conf
 require cip-core-common.inc
 
+DISTRO_APT_SOURCES = "conf/distro/debian-stretch.list"
+
 PREFERRED_VERSION_linux-cip ?= "4.19.%"
 PREFERRED_VERSION_linux-cip-rt ?= "4.19.%"
diff --git a/isar-patches/0001-u-boot-add-libubootenv.patch b/isar-patches/0001-u-boot-add-libubootenv.patch
deleted file mode 100644
index 6002cf1..0000000
--- a/isar-patches/0001-u-boot-add-libubootenv.patch
+++ /dev/null
@@ -1,168 +0,0 @@
-From dda00e6addc7c51862b8175d473a1ea42dcd5c9e Mon Sep 17 00:00:00 2001
-From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
-Date: Fri, 19 Jun 2020 17:00:36 +0200
-Subject: [PATCH v2] u-boot: add libubootenv
-
-Add the new library libubootenv and remove fw_printenv and fw_setenv
-form u-boot-tools as the are now part of the new library.
-
-libubootenv is a library that provides a hardware independent
-way to access to U-Boot environment. U-Boot has its default environment
-compiled board-dependently and this means that tools to access the environment
-are also board specific, too.
-
-libubootenv conflicts with u-boot-tools from Debian 10
-as both try to install fw_printenv and fw_sentenv. This conflict is not
-part of the control file as it breaks the installation of custom u-boot-tools
-from the u-boot-sources.
-
-This patch uses dpkg-gdb to build the package from salsa.debian.org and adds
-a fix for https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=967487.
-
-Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
----
-
-Changes V2:
-- use dpkg-gbd instead dpkg
-- use salsa.debian.org as source
-- add fix for https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=967487
-
- meta-isar/conf/machine/de0-nano-soc.conf      |  2 +-
- .../0002-Add-support-GNUInstallDirs.patch     | 48 +++++++++++++++++++
- .../libubootenv/libubootenv_0.2.bb            | 30 ++++++++++++
- .../files/debian/u-boot-tools.conffiles       |  1 -
- .../u-boot/files/debian/u-boot-tools.install  |  2 -
- .../u-boot/files/debian/u-boot-tools.links    |  1 -
- 6 files changed, 79 insertions(+), 5 deletions(-)
- create mode 100644 meta/recipes-bsp/libubootenv/files/0002-Add-support-GNUInstallDirs.patch
- create mode 100644 meta/recipes-bsp/libubootenv/libubootenv_0.2.bb
- delete mode 100644 meta/recipes-bsp/u-boot/files/debian/u-boot-tools.conffiles
- delete mode 100644 meta/recipes-bsp/u-boot/files/debian/u-boot-tools.links
-
-diff --git a/meta-isar/conf/machine/de0-nano-soc.conf b/meta-isar/conf/machine/de0-nano-soc.conf
-index 3a2c009..6558d90 100644
---- a/meta-isar/conf/machine/de0-nano-soc.conf
-+++ b/meta-isar/conf/machine/de0-nano-soc.conf
-@@ -15,4 +15,4 @@ WKS_FILE ?= "de0-nano-soc.wks.in"
- IMAGER_INSTALL += "u-boot-de0-nano-soc"
- IMAGER_BUILD_DEPS += "u-boot-de0-nano-soc"
- 
--IMAGE_INSTALL += "u-boot-tools u-boot-script"
-+IMAGE_INSTALL += "u-boot-tools libubootenv u-boot-script"
-diff --git a/meta/recipes-bsp/libubootenv/files/0002-Add-support-GNUInstallDirs.patch b/meta/recipes-bsp/libubootenv/files/0002-Add-support-GNUInstallDirs.patch
-new file mode 100644
-index 0000000..f8c3038
---- /dev/null
-+++ b/meta/recipes-bsp/libubootenv/files/0002-Add-support-GNUInstallDirs.patch
-@@ -0,0 +1,48 @@
-+From b17d194bd8285a19382a902a0bec9e5e042df064 Mon Sep 17 00:00:00 2001
-+From: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
-+Date: Tue, 16 Apr 2019 08:52:01 +0900
-+Subject: [PATCH 2/4] Add support GNUInstallDirs
-+
-+This adds the functionality of the module "GNUInstallDirs" to make the
-+installation compatible with GNU.
-+
-+https://cmake.org/cmake/help/v3.14/module/GNUInstallDirs.html
-+
-+Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
-+---
-+ CMakeLists.txt     | 2 ++
-+ src/CMakeLists.txt | 8 ++++----
-+ 2 files changed, 6 insertions(+), 4 deletions(-)
-+
-+diff --git a/CMakeLists.txt b/CMakeLists.txt
-+index 104969e..57477fc 100644
-+--- a/CMakeLists.txt
-++++ b/CMakeLists.txt
-+@@ -10,6 +10,8 @@ add_definitions(-DVERSION="${VERSION}")
-+ 
-+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
-+ 
-++include("GNUInstallDirs")
-++
-+ #set(CMAKE_C_FLAGS_DEBUG "-g")
-+ include_directories ("${PROJECT_SOURCE_DIR}/src")
-+ add_subdirectory (src)
-+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
-+index ea5979c..d97f221 100644
-+--- a/src/CMakeLists.txt
-++++ b/src/CMakeLists.txt
-+@@ -19,7 +19,7 @@ add_executable(fw_setenv fw_setenv.c)
-+ target_link_libraries(fw_printenv ubootenv z)
-+ target_link_libraries(fw_setenv ubootenv z)
-+ 
-+-install (TARGETS ubootenv DESTINATION lib)
-+-install (FILES libuboot.h DESTINATION include)
-+-install (TARGETS fw_printenv DESTINATION bin)
-+-install (TARGETS fw_setenv DESTINATION bin)
-++install (TARGETS ubootenv DESTINATION "${CMAKE_INSTALL_LIBDIR}")
-++install (FILES libuboot.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
-++install (TARGETS fw_printenv DESTINATION "${CMAKE_INSTALL_BINDIR}")
-++install (TARGETS fw_setenv DESTINATION "${CMAKE_INSTALL_BINDIR}")
-+-- 
-+2.20.1
-+
-diff --git a/meta/recipes-bsp/libubootenv/libubootenv_0.2.bb b/meta/recipes-bsp/libubootenv/libubootenv_0.2.bb
-new file mode 100644
-index 0000000..995e581
---- /dev/null
-+++ b/meta/recipes-bsp/libubootenv/libubootenv_0.2.bb
-@@ -0,0 +1,30 @@
-+# libubootenv
-+#
-+# This software is a part of ISAR.
-+# Copyright (c) Siemens AG, 2020
-+#
-+# SPDX-License-Identifier: MIT
-+
-+DESCRIPTION = "swupdate utility for software updates"
-+HOMEPAGE= "https://github.com/sbabic/swupdate"
-+LICENSE = "GPL-2.0"
-+LIC_FILES_CHKSUM = "file://${LAYERDIR_isar}/licenses/COPYING.GPLv2;md5=751419260aa954499f7abaabaa882bbe"
-+
-+inherit dpkg-gbp
-+
-+SRC_URI = "git://salsa.debian.org/debian/libubootenv.git;protocol=https \
-+           file://0002-Add-support-GNUInstallDirs.patch;apply=no "
-+SRCREV = "2c7cb6d941d906dcc1d2e447cc17e418485dff12"
-+
-+S = "${WORKDIR}/git"
-+
-+do_prepare_build() {
-+  cd ${S}
-+  export QUILT_PATCHES=debian/patches
-+  quilt import -f ${WORKDIR}/*.patch
-+	quilt push -a
-+}
-+
-+dpkg_runbuild_prepend() {
-+	export DEB_BUILD_OPTIONS="nocheck"
-+}
-diff --git a/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.conffiles b/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.conffiles
-deleted file mode 100644
-index d49a8fb..0000000
---- a/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.conffiles
-+++ /dev/null
-@@ -1 +0,0 @@
--/etc/fw_env.config
-diff --git a/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.install b/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.install
-index d1ae3e0..2893b9a 100644
---- a/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.install
-+++ b/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.install
-@@ -1,5 +1,3 @@
- tools/dumpimage		/usr/bin/
--tools/env/fw_printenv	/usr/bin/
- tools/mkenvimage	/usr/bin/
- tools/mkimage		/usr/bin/
--tools/env/fw_env.config	/etc
-diff --git a/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.links b/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.links
-deleted file mode 100644
-index 92f5a6c..0000000
---- a/meta/recipes-bsp/u-boot/files/debian/u-boot-tools.links
-+++ /dev/null
-@@ -1 +0,0 @@
--/usr/bin/fw_printenv /usr/bin/fw_setenv
--- 
-2.20.1
-
diff --git a/kas-cip.yml b/kas-cip.yml
index 66a58f1..922ee7e 100644
--- a/kas-cip.yml
+++ b/kas-cip.yml
@@ -20,13 +20,10 @@ repos:
 
   isar:
     url: https://github.com/ilbers/isar.git
-    refspec: 351af175bc54a201c6f44307d4e998bd6c0afdb8
+    refspec: 76eac233f1b1d0d117b3f05b3dec8a6da1cdf4c7
     layers:
       meta:
     patches:
-      01-libubootenv:
-        path: isar-patches/0001-u-boot-add-libubootenv.patch
-        repo: cip-core
       02-initramfs:
         path: isar-patches/v7-0001-meta-support-Generate-a-custom-initramfs.patch
         repo: cip-core
diff --git a/scripts/lib/wic/plugins/source/efibootguard-boot.py b/scripts/lib/wic/plugins/source/efibootguard-boot.py
index d291f75..b85cfca 100644
--- a/scripts/lib/wic/plugins/source/efibootguard-boot.py
+++ b/scripts/lib/wic/plugins/source/efibootguard-boot.py
@@ -35,7 +35,7 @@ import logging
 msger = logging.getLogger('wic')
 
 from wic.pluginbase import SourcePlugin
-from wic.utils.misc import exec_cmd, get_bitbake_var, BOOTDD_EXTRA_SPACE
+from wic.misc import exec_cmd, get_bitbake_var, BOOTDD_EXTRA_SPACE
 
 class EfibootguardBootPlugin(SourcePlugin):
     """
diff --git a/scripts/lib/wic/plugins/source/efibootguard-efi.py b/scripts/lib/wic/plugins/source/efibootguard-efi.py
index 6647212..9eb2353 100644
--- a/scripts/lib/wic/plugins/source/efibootguard-efi.py
+++ b/scripts/lib/wic/plugins/source/efibootguard-efi.py
@@ -33,7 +33,7 @@ import os
 msger = logging.getLogger('wic')
 
 from wic.pluginbase import SourcePlugin
-from wic.utils.misc import exec_cmd, get_bitbake_var, BOOTDD_EXTRA_SPACE
+from wic.misc import exec_cmd, get_bitbake_var, BOOTDD_EXTRA_SPACE
 
 class EfibootguardEFIPlugin(SourcePlugin):
     """
