diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md
index df42fcfa6..2f385e5d1 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/10.n1/20.overview/cheatsheet.fr.md
@@ -77,7 +77,7 @@ Référentiel femme :
 
 _("selon" au niveau 1, "en fonction de" si niveau 2?)_
 
-![](special-relativity-variation-versus-speed_L1200.gif)
+![](special-relativity-variation-versus-speed_L1200.jpg)
 
 commentaire synthétique figure à faire.