diff --git a/BLcourse2.3/convert-to-ipynb.sh b/BLcourse2.3/convert-to-ipynb.sh
index be23e43b6e01e4ad115436765c007a8a12c78684..82f9566c576371f7a70f8d33f0a4866955adb8db 100755
--- a/BLcourse2.3/convert-to-ipynb.sh
+++ b/BLcourse2.3/convert-to-ipynb.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
 
 for fn in 0*dim.py; do
-    jupytext --to ipynb $fn
+    jupytext --to ipynb --update $fn
 done