diff --git a/docs/design/firmware-design.rst b/docs/design/firmware-design.rst
index 8e9dc38..7d99d86 100644
--- a/docs/design/firmware-design.rst
+++ b/docs/design/firmware-design.rst
@@ -2720,11 +2720,11 @@
 *Copyright (c) 2013-2020, Arm Limited and Contributors. All rights reserved.*
 
 .. _Power State Coordination Interface PDD: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf
-.. _SMCCC: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf
+.. _SMCCC: https://developer.arm.com/docs/den0028/latest
 .. _PSCI: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf
 .. _Power State Coordination Interface PDD: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf
 .. _Arm ARM: https://developer.arm.com/docs/ddi0487/latest
-.. _SMC Calling Convention PDD: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf
+.. _SMC Calling Convention: https://developer.arm.com/docs/den0028/latest
 .. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT) Armv8-A (ARM DEN0006D): https://developer.arm.com/docs/den0006/latest/trusted-board-boot-requirements-client-tbbr-client-armv8-a
 
 .. |Image 1| image:: ../resources/diagrams/rt-svc-descs-layout.png