diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9282be0..fe0908a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Record of the modification in project development.
 ## [Unreleased] - yyyy-mm-dd
 ### Added
 ### Changed
+- [Issue 25 : Refactoring: Sourcing config.sys is not needed in the chrooted_job](https://github.com/suikan4github/kaiten-yaki/issues/25)
 - [Issue 26 : Update AN01 for btrfs](https://github.com/suikan4github/kaiten-yaki/issues/26)
 
 ### Deprecated
diff --git a/script/lib/chrooted_job_ubuntu.sh b/script/lib/chrooted_job_ubuntu.sh
index 2d953ca..6d8cd57 100644
--- a/script/lib/chrooted_job_ubuntu.sh
+++ b/script/lib/chrooted_job_ubuntu.sh
@@ -1,9 +1,5 @@
 #!/bin/bash
 
-# Include configuration. This sript file have to be executed at Kaiten-yaki/script dir
-# shellcheck disable=SC1091
-source config.sh
-
 # Create a key file for LUKS and register it as contents of the initramfs image
 function chrooted_job() {
 	# Mount the rest of partitions by target /etc/fstab
diff --git a/script/lib/chrooted_job_void.sh b/script/lib/chrooted_job_void.sh
index 2d50a73..9ce0c82 100644
--- a/script/lib/chrooted_job_void.sh
+++ b/script/lib/chrooted_job_void.sh
@@ -1,9 +1,5 @@
 #!/bin/bash
 
-# Include configuration. This sript file have to be executed at Kaiten-yaki/script dir
-# shellcheck disable=SC1091
-source config.sh
-
 # Create a key file for LUKS and register it as contents of the initramfs image
 function chrooted_job() {
 	# Mount the rest of partitions by target /etc/fstab