diff --git a/debian/changelog b/debian/changelog
index 64e3599..13a267b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,7 +1,12 @@
nkf (1:2.1.5-2) UNRELEASED; urgency=medium
+ [ NOKUBI Takatsugu ]
* d/watch: fix mangling
+ [ Debian Janitor ]
+ * Remove constraints unnecessary since buster (oldstable):
+ + Build-Depends: Drop versioned constraint on perl.
+
-- NOKUBI Takatsugu <knok@daionet.gr.jp> Wed, 09 Jan 2019 15:35:57 +0900
nkf (1:2.1.5-1) unstable; urgency=medium
diff --git a/debian/control b/debian/control
index 347a83b..5be4b35 100644
--- a/debian/control
+++ b/debian/control
@@ -1,7 +1,7 @@
Source: nkf
Section: text
Priority: optional
-Build-Depends: debhelper (>= 10), perl (>= 5.6.0-16)
+Build-Depends: debhelper (>= 10), perl
Maintainer: NOKUBI Takatsugu <knok@daionet.gr.jp>
Standards-Version: 4.3.0
Homepage: https://osdn.net/projects/nkf/