diff --git a/readme.md b/readme.md
index d9f2865..67d7469 100644
--- a/readme.md
+++ b/readme.md
@@ -2242,7 +2242,7 @@ Can be shown stretched by specifying the `actual_id`.
 ---
 <a name="Opengrab"></a>
 ## Opengrab
-Nicodrone OpenGrab V3 electro-permanent magnet, see <https://nicadrone.com/products/epm-v3>.
+Nicodrone OpenGrab V3 electro-permanent magnet, see <https://kb.zubax.com/display/MAINKB/OpenGrab+EPM+v3>.
 
 A permanent magnet that can be magnetized and de-magnetized electronically.
 
diff --git a/vitamins/opengrab.scad b/vitamins/opengrab.scad
index 78f154a..65a67c9 100644
--- a/vitamins/opengrab.scad
+++ b/vitamins/opengrab.scad
@@ -18,7 +18,7 @@
 //
 
 //
-//! Nicodrone OpenGrab V3 electro-permanent magnet, see <https://nicadrone.com/products/epm-v3>.
+//! Nicodrone OpenGrab V3 electro-permanent magnet, see <https://kb.zubax.com/display/MAINKB/OpenGrab+EPM+v3>.
 //!
 //! A permanent magnet that can be magnetized and de-magnetized electronically.
 //