Bump N+ version to 21.
diff --git a/alpine/Makefile b/alpine/Makefile
index 888e5da..780db6c 100644
--- a/alpine/Makefile
+++ b/alpine/Makefile
@@ -2,7 +2,7 @@
BASE_VERSION= 1.17.9
BASE_RELEASE= 1
-PLUS_VERSION= 20
+PLUS_VERSION= 21
PLUS_RELEASE= ${BASE_RELEASE}
BASE_SRC= nginx-$(BASE_VERSION).tar.gz
SRCDIR= nginx-$(BASE_VERSION)
diff --git a/debian/Makefile b/debian/Makefile
index 33f5a31..06660f6 100644
--- a/debian/Makefile
+++ b/debian/Makefile
@@ -2,7 +2,7 @@
BASE_VERSION= 1.17.9
BASE_RELEASE= 1
-PLUS_VERSION= 20
+PLUS_VERSION= 21
BASE_SRC= nginx-$(BASE_VERSION).tar.gz
SRCDIR= nginx-$(BASE_VERSION)
SRCPATH?= ../..
diff --git a/rpm/SPECS/Makefile b/rpm/SPECS/Makefile
index 13632f2..bfadf2e 100644
--- a/rpm/SPECS/Makefile
+++ b/rpm/SPECS/Makefile
@@ -2,7 +2,7 @@
BASE_VERSION= 1.17.9
BASE_RELEASE= 1
-PLUS_VERSION= 20
+PLUS_VERSION= 21
BASE_SRC= nginx-$(BASE_VERSION).tar.gz
SRCPATH?= ../SOURCES
BUILD_ENV_PATH= ${HOME}/rpmbuild
