diff --git a/rules/isc-dhcp.mk b/rules/isc-dhcp.mk
index 1a1ad54678b8..0951836470ce 100644
--- a/rules/isc-dhcp.mk
+++ b/rules/isc-dhcp.mk
@@ -1,7 +1,7 @@
 # isc-dhcp packages
 
 ISC_DHCP_VERSION = 4.4.1
-ISC_DHCP_VERSION_FULL = ${ISC_DHCP_VERSION}-2.3
+ISC_DHCP_VERSION_FULL = ${ISC_DHCP_VERSION}-2.3+deb11u1
 
 export ISC_DHCP_VERSION ISC_DHCP_VERSION_FULL