diff --git a/debian.control b/debian.control
index efdaf73..18a2fa4 100644
--- a/debian.control
+++ b/debian.control
@@ -6,11 +6,12 @@ Standards-Version: 4.5.0
 
 Package: system-user-grommunio
 Architecture: all
-Pre-Depends: adduser, passwd, system-group-gromoxcf, ${misc:Pre-Depends}
+Pre-Depends: adduser, passwd, ${misc:Pre-Depends}
 Depends: ${misc:Depends}
 Provides: system-group-groindex, system-group-grommunio,
- system-group-groweb, system-user-grommunio, system-user-groindex,
- system-user-groweb
+ system-group-groweb, system-group-gromoxcf,
+ system-user-grommunio, system-user-groindex, system-user-groweb
+# gromoxcf provided by more than one package -- intentional
 Replaces: system-user-groweb
 Breaks: system-user-groweb
 Description: General grommunio system user identities
diff --git a/debian.rules b/debian.rules
index bbb9c60..31f3994 100644
--- a/debian.rules
+++ b/debian.rules
@@ -6,8 +6,8 @@ sufile = ${sudir}/system-user-grommunio.conf
 override_dh_auto_install:
 	mkdir -p ${sudir}
 	echo 'u grommunio - "user for grommunio administration"' >${sufile}
-	echo 'u groweb - "user for grommunio-web"' >${sufile}
-	echo 'u groindex - "user for grommunio-index"' >${sufile}
-	echo 'm grommunio gromoxcf' >${sufile}
-	echo 'm groindex groweb' >${sufile}
-	echo 'm groindex gromoxcf' >${sufile}
+	echo 'u groweb - "user for grommunio-web"' >>${sufile}
+	echo 'u groindex - "user for grommunio-index"' >>${sufile}
+	echo 'm grommunio gromoxcf' >>${sufile}
+	echo 'm groindex groweb' >>${sufile}
+	echo 'm groindex gromoxcf' >>${sufile}
diff --git a/system-user-grommunio.changes b/system-user-grommunio.changes
index 447c0d3..7224f5e 100644
--- a/system-user-grommunio.changes
+++ b/system-user-grommunio.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Aug 14 11:26:06 UTC 2024 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to release 9
+  * Switch to sysusers mechanism
+
 -------------------------------------------------------------------
 Tue Jun  4 08:03:16 UTC 2024 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/system-user-grommunio.conf b/system-user-grommunio.conf
new file mode 100644
index 0000000..6d45178
--- /dev/null
+++ b/system-user-grommunio.conf
@@ -0,0 +1,7 @@
+u grommunio - "user for grommunio administration"
+u groweb - "user for grommunio-web"
+u groindex - "user for grommunio-index"
+g gromoxcf
+m grommunio gromoxcf
+m groindex groweb
+m groindex gromoxcf
diff --git a/system-user-grommunio.dsc b/system-user-grommunio.dsc
index 6122e5c..238718a 100644
--- a/system-user-grommunio.dsc
+++ b/system-user-grommunio.dsc
@@ -1,7 +1,7 @@
 Format: 1.0
 Source: system-user-grommunio
 Architecture: all
-Version: 7
+Version: 9
 Maintainer: Grommunio <null@grommunio.com>
 Homepage: https://grommunio.com
 Standards-Version: 3.9.4
diff --git a/system-user-grommunio.spec b/system-user-grommunio.spec
index da293d2..d5074e3 100644
--- a/system-user-grommunio.spec
+++ b/system-user-grommunio.spec
@@ -17,7 +17,7 @@
 
 
 Name:           system-user-grommunio
-Version:        7
+Version:        9
 Release:        0
 Summary:        General grommunio system user identities
 License:        MIT
@@ -31,16 +31,9 @@ Provides:       system-user-groweb = %version-%release
 BuildRequires:  sysuser-tools
 %sysusers_requires
 %else
-Provides:       group(groindex)
-Provides:       group(grommunio)
-Provides:       group(groweb)
-Provides:       user(groindex)
-Provides:       user(grommunio)
-Provides:       user(groweb)
 Requires(pre):  /usr/sbin/useradd
 Requires(pre):  /usr/sbin/groupadd
 %endif
-Requires(pre):  group(gromoxcf)
 
 %description
 This package provides identities related to the Grommunio groupware suite:
@@ -58,36 +51,17 @@ This package provides identities related to the Grommunio groupware suite:
 %prep
 
 %build
-cat <<-EOF >u.conf
-	u grommunio - "user for grommunio administration"
-	u groweb - "user for grommunio-web"
-	u groindex - "user for grommunio-index"
-	m grommunio gromoxcf
-	m groindex groweb
-	m groindex gromoxcf
-EOF
-%if 0%{?suse_version}
-%sysusers_generate_pre u.conf user system-user-grommunio.conf
-%else
 >user.pre
+%if 0%{?suse_version}
+%sysusers_generate_pre %_sourcedir/system-user-grommunio.conf user system-user-grommunio.conf
 %endif
 
 %install
 install -Dpm0644 u.conf "%buildroot/%_sysusersdir/system-user-grommunio.conf"
 
 %pre -f user.pre
-%if !0%{?suse_version}
-getent group grommunio >/dev/null || %_sbindir/groupadd -r grommunio
-getent passwd grommunio >/dev/null || %_sbindir/useradd -g grommunio -s /sbin/nologin \
-	-r -c "user for grommunio administration" -d / grommunio
-getent group groweb >/dev/null || %_sbindir/groupadd -r groweb
-getent passwd groweb >/dev/null || %_sbindir/useradd -g groweb -s /sbin/nologin \
-	-r -c "user for grommunio-web" -d / groweb
-getent group groindex >/dev/null || %_sbindir/groupadd -r groindex
-getent passwd groindex >/dev/null || %_sbindir/useradd -g groindex -s /sbin/nologin \
-	-r -c "user for grommunio-index" -d / groindex
-usermod grommunio -aG gromoxcf
-usermod groindex -aG gromoxcf
+%if 0%{?rhel} || 0%{?fedora_version}
+%sysusers_create_compat %_sourcedir/system-user-grommunio.conf
 %endif
 
 %files