diff --git a/conf/distro/debian-snapshot.list b/conf/distro/debian-snapshot.list
deleted file mode 100644
index 11feaf5b7..000000000
--- a/conf/distro/debian-snapshot.list
+++ /dev/null
@@ -1,8 +0,0 @@
-deb	[check-valid-until=no] http://snapshot.debian.org/archive/debian/20231023T151630Z/ bookworm main contrib non-free-firmware non-free
-deb-src	[check-valid-until=no] http://snapshot.debian.org/archive/debian/20231023T151630Z/ bookworm main contrib non-free-firmware non-free
-
-deb	[check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20231023T151630Z/ bookworm-security/updates main contrib non-free-firmware non-free
-deb-src	[check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20231023T151630Z/ bookworm-security/updates main contrib non-free-firmware non-free
-
-deb	[check-valid-until=no] http://snapshot.debian.org/archive/debian/20231023T151630Z/ bookworm-updates main contrib non-free-firmware non-free
-deb-src	[check-valid-until=no] http://snapshot.debian.org/archive/debian/20231023T151630Z/ bookworm-updates main contrib non-free-firmware non-free
diff --git a/conf/distro/iot2050-debian.conf b/conf/distro/iot2050-debian.conf
index 584fe88ae..ec03bd45f 100644
--- a/conf/distro/iot2050-debian.conf
+++ b/conf/distro/iot2050-debian.conf
@@ -24,21 +24,6 @@ KERNEL_NAME ?= "cip"
 PREFERRED_VERSION_customizations ?= "0.1-iot2050-debian"
 PREFERRED_VERSION_customizations-debug ?= "0.1-iot2050-debian"
 
-OVERRIDES .= ':${PACKAGES_SELECTION}'
-
-# packages-mainline: Use the mainline debian packages
-# packages-snapshot: Use the snapshot debian packages
-PACKAGES_SELECTION ?= "packages-mainline"
-
-DISTRO_APT_SOURCES_MAINLINE_LIST := "${DISTRO_APT_SOURCES}"
-DISTRO_APT_SOURCES_SNAPSHOT_LIST ?= "conf/distro/debian-snapshot.list"
-
-DISTRO_APT_SOURCES:append:packages-snapshot = " ${DISTRO_APT_SOURCES_SNAPSHOT_LIST}"
-DISTRO_APT_SOURCES:remove:packages-snapshot = "${DISTRO_APT_SOURCES_MAINLINE_LIST}"
-
-HOST_DISTRO_APT_SOURCES:append:packages-snapshot = " ${DISTRO_APT_SOURCES_SNAPSHOT_LIST}"
-HOST_DISTRO_APT_SOURCES:remove:packages-snapshot = "${DISTRO_APT_SOURCES_MAINLINE_LIST}"
-
 SDK_INSTALL += "linux-headers-${KERNEL_NAME} mraa"
 SDK_PREINSTALL += "zlib1g-dev:${DISTRO_ARCH} libjson-c-dev:${DISTRO_ARCH}"
 
diff --git a/kas/iot2050.yml b/kas/iot2050.yml
index 80a279ec9..ba472229f 100644
--- a/kas/iot2050.yml
+++ b/kas/iot2050.yml
@@ -1,5 +1,5 @@
 #
-# Copyright (c) Siemens AG, 2019-2023
+# Copyright (c) Siemens AG, 2019-2024
 #
 # Authors:
 #  Le Jin <le.jin@siemens.com>
@@ -27,13 +27,13 @@ repos:
 
   isar:
     url: https://github.com/ilbers/isar
-    commit: 9dc362cd7115074c0f60843e687ed89db5c9339a
+    commit: a2a997b66daf3d684a7ad29108971a463cfac522
     layers:
       meta:
 
   cip-core:
     url: https://gitlab.com/cip-project/cip-core/isar-cip-core.git
-    commit: 704353612238cb2ac1c16f29db6f314b60cd83b0
+    commit: bafd102601ae21c2b2643d536d62fb7cc5f98767
 
 local_conf_header:
   standard: |
diff --git a/kas/opt/package-lock.yml b/kas/opt/package-lock.yml
index 3c1d43c81..afe0dcd5b 100644
--- a/kas/opt/package-lock.yml
+++ b/kas/opt/package-lock.yml
@@ -1,5 +1,5 @@
 #
-# Copyright (c) Siemens AG, 2019
+# Copyright (c) Siemens AG, 2019-2024
 #
 # Authors:
 #  Su Bao Cheng <baocheng.su@siemens.com>
@@ -13,4 +13,6 @@ header:
 
 local_conf_header:
   package-lock: |
-    PACKAGES_SELECTION := "packages-snapshot"
+    # 2023-10-23 15:16:30 UTC
+    ISAR_APT_SNAPSHOT_TIMESTAMP = "1698074190"
+    ISAR_USE_APT_SNAPSHOT = "1"
diff --git a/recipes-core/images/iot2050-image-base.bb b/recipes-core/images/iot2050-image-base.bb
index efa3f5cfc..b4b45fa01 100644
--- a/recipes-core/images/iot2050-image-base.bb
+++ b/recipes-core/images/iot2050-image-base.bb
@@ -18,45 +18,6 @@ IMAGE_INSTALL += "customizations-base"
 
 IMAGE_PREINSTALL += "libubootenv-tool"
 
-python aggregate_mainline_apt_sources () {
-    import shutil
-
-    aggregated_sources_fp = '%s/bootstrap.list' % d.getVar("WORKDIR", True)
-    raw_apt_sources_list = d.getVar("DISTRO_APT_SOURCES_MAINLINE_LIST", True) or ""
-    apt_sources_list = raw_apt_sources_list.strip().split()
-
-    if len(apt_sources_list) == 0:
-        bb.fatal("Cannot parse DISTRO_APT_SOURCES_MAINLINE_LIST: %s" % 
-            raw_apt_sources_list)
-
-    with open(aggregated_sources_fp, "wb") as out_fd:
-        for entry in apt_sources_list:
-            entry_real = bb.parse.resolve_file(entry, d)
-            with open(entry_real, "rb") as in_fd:
-                shutil.copyfileobj(in_fd, out_fd, 1024*1024*10)
-            out_fd.write("\n".encode())
-}
-
-install_mainline_sources_list () {
-    sudo rm -f '${IMAGE_ROOTFS}/etc/apt/sources-list'
-    sudo install -m 644 '${WORKDIR}/bootstrap.list' '${IMAGE_ROOTFS}/etc/apt/sources-list'
-    sudo rm -f '${WORKDIR}/bootstrap.list'
-}
-
-# For rootfs build using debian snapshot packages, restore the source list file
-# with the mainline sources list, so that users can update packages via 
-# `apt update`.
-# TODO: this code should be merged to ISAR.
-ROOTFS_POSTPROCESS_COMMAND =+ "image_postprocess_restore_sources_list"
-python image_postprocess_restore_sources_list () {
-    pkg_selection = d.getVar("PACKAGES_SELECTION", True) or ""
-    if pkg_selection == 'packages-snapshot':
-        bb.build.exec_func("aggregate_mainline_apt_sources", d)
-        bb.build.exec_func("install_mainline_sources_list", d)
-    else:
-        bb.note('No need to restore sources for mainline packages')
-}
-
 # Make the .wic.img symlink to the .wic file for better backward compatibility
 do_deploy() {
     echo "Linking wic img"