diff --git a/content/docs/concepts/security.mdx b/content/docs/concepts/security.mdx
index f3d9814b..ba521bfa 100644
--- a/content/docs/concepts/security.mdx
+++ b/content/docs/concepts/security.mdx
@@ -47,7 +47,7 @@ security and performance.
 Because of their intrinsic characteristics, unikernels projects have, in the
 past, claimed high security for cloud appliances. However, their security
 properties have been [called into
-question](https://research.nccgroup.com/wp-content/uploads/2020/07/ncc_group-assessing_unikernel_security.pdf),
+question](https://www.nccgroup.com/media/tgsj1css/_ncc_group-assessing_unikernel_security.pdf),
 as existing research prototypes failed to match mainstream OSes' security
 features, robustness, and testing. This aspect has historically been overlooked
 by unikernel prototypes for many reasons, including the fact that many, if not