diff --git a/Makefile b/Makefile
index baef42281..2e776a85f 100644
--- a/Makefile
+++ b/Makefile
@@ -130,6 +130,7 @@ release_excludes = $(strip $(UPDATE_PATH_EXCLUDES:%='-x!$1%') $(UPDATE_GLOBAL_EX
 define mkupdate
 cd $(INSTALL_DIR) &&
 '$(abspath tools/mkrelease.sh)'
+--epoch="$$(git log -1 --format='%cs' "$$(git describe --tags | cut -d- -f1)")"
 $(if $(PARALLEL_JOBS),--jobs $(PARALLEL_JOBS))
 --manifest=$(or $2,koreader)/ota/package.index
 $(foreach a,$1,'$(if $(filter --%,$a),$a,$(abspath $a))') $(or $2,koreader)
diff --git a/frontend/ui/otamanager.lua b/frontend/ui/otamanager.lua
index 100ec306e..2a693234b 100644
--- a/frontend/ui/otamanager.lua
+++ b/frontend/ui/otamanager.lua
@@ -307,8 +307,9 @@ function OTAManager:_buildLocalPackage()
     local tar_cmd = {
         './tar',
         '--create', '--file='..self.installed_package,
+        '--mtime', tostring(Version:getBuildDate()),
         '--numeric-owner', '--owner=0', '--group=0',
-        '--no-recursion', '-C', '..',
+        '--ignore-failed-read', '--no-recursion', '-C', '..',
         '--verbatim-files-from', '--files-from', self.package_indexfile,
     }