diff --git a/README.md b/README.md
index b239d65..69bbdba 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ If you don't have YunoHost, please consult [the guide](https://yunohost.org/#/in
 
 Publishing, memberships, subscriptions and newsletters platform
 
-**Shipped version:** 4.20.3~ynh1
+**Shipped version:** 4.21.0~ynh1
 
 
 
diff --git a/README_fr.md b/README_fr.md
index 84273d0..0f08e6e 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -13,7 +13,7 @@ Si vous n'avez pas YunoHost, regardez [ici](https://yunohost.org/#/install) pour
 
 Plateforme d'édition, d'adhésions, d'abonnements et de newsletters
 
-**Version incluse :** 4.20.3~ynh1
+**Version incluse :** 4.21.0~ynh1
 
 
 
diff --git a/check_process b/check_process
index f4e3327..7011b1e 100644
--- a/check_process
+++ b/check_process
@@ -12,7 +12,9 @@
 		setup_public=1
 		upgrade=1
 		# 4.9.4
-        upgrade=1       from_commit=7a150ab29ee969f72dd7846539ae12ac1975165b
+		upgrade=1       from_commit=7a150ab29ee969f72dd7846539ae12ac1975165b
+		# 4.17.1
+		upgrade=1       from_commit=09f260c04435df35edca042486b6a8eb3160333b
 		backup_restore=1
 		multi_instance=1
 		change_url=0
@@ -22,3 +24,5 @@ Notification=none
 ;;; Upgrade options
 	; commit=7a150ab29ee969f72dd7846539ae12ac1975165b
 		name=4.9.4
+	; commit=09f260c04435df35edca042486b6a8eb3160333b
+		name=4.17.1
diff --git a/conf/admin.src b/conf/admin.src
index 39ea75c..eee7029 100644
--- a/conf/admin.src
+++ b/conf/admin.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/TryGhost/Admin/archive/refs/tags/v4.20.3.zip
-SOURCE_SUM=7d65b09ead2096c4f8a424b680bfbbe64453d7ae10decd6f7b5f680e55e03f31
+SOURCE_URL=https://github.com/TryGhost/Admin/archive/refs/tags/v4.21.0.zip
+SOURCE_SUM=cda92f23ed4b197a44be1cf784e8df540e8875ebc740331c149880442371b0bd
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=false
diff --git a/conf/app.src b/conf/app.src
index e3912fa..5ebe50a 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/TryGhost/Ghost/releases/download/v4.20.3/Ghost-4.20.3.zip
-SOURCE_SUM=50d88c47cd9aa8d2b06a6b84729b015352a1cf311fdce5f441bb0e7def0c4fbf
+SOURCE_URL=https://github.com/TryGhost/Ghost/releases/download/v4.21.0/Ghost-4.21.0.zip
+SOURCE_SUM=b4c0fdd647dea61bb30906d73bb3d135ef2d09b2490e3bb7d66cb118319ea283
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=false
diff --git a/conf/systemd.service b/conf/systemd.service
index fcd502c..442545c 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -17,7 +17,8 @@ Restart=always
 NoNewPrivileges=yes
 PrivateTmp=yes
 PrivateDevices=yes
-RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
+#RestrictAddressFamilies disabled, prevents any write access on the app
+#RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
 RestrictNamespaces=yes
 RestrictRealtime=yes
 DevicePolicy=closed
diff --git a/manifest.json b/manifest.json
index f078d84..ba2468b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Publishing, memberships, subscriptions and newsletters platform",
         "fr": "Plateforme d'édition, d'adhésions, d'abonnements et de newsletters"
     },
-    "version": "4.20.3~ynh1",
+    "version": "4.21.0~ynh1",
     "url": "https://ghost.org/",
     "upstream": {
         "license": "MIT",