diff --git a/.gitattributes b/.gitattributes
index dc0531e..f96d5bf 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1,4 @@
-*.png filter=lfs diff=lfs merge=lfs -text
-*.pdf filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text lockable
+*.pdf filter=lfs diff=lfs merge=lfs -text lockable
+*.jpg filter=lfs diff=lfs merge=lfs -text lockable
+*.jpeg filter=lfs diff=lfs merge=lfs -text lockable