diff --git a/Makefile b/Makefile
index 2c41548..701b82e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # also bump pve-kernel-meta if either of MAJ.MIN, PATCHLEVEL or KREL change
 KERNEL_MAJ=5
 KERNEL_MIN=11
-KERNEL_PATCHLEVEL=17
+KERNEL_PATCHLEVEL=21
 # increment KREL if the ABI changes (abicheck target in debian/rules)
 # rebuild packages with new KREL and run 'make abiupdate'
 KREL=1
diff --git a/debian/changelog b/debian/changelog
index 06c5435..0cc9f8e 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+pve-kernel (5.11.21-1) bullseye; urgency=medium
+
+  * update sources to stable release 5.11.21 with Ubuntu-5.11.0-19.20
+
+ -- Proxmox Support Team <support@proxmox.com>  Tue, 01 Jun 2021 16:38:57 +0200
+
 pve-kernel (5.11.17-1) bullseye; urgency=medium
 
   * update sources to stable release 5.11.17 with Ubuntu-5.11.0-18.19