diff --git a/sekaictf2025/alterego/montgomery_isogenies/kummer_isogeny.py b/sekaictf2025/alterego/montgomery_isogenies/kummer_isogeny.py
index 76a6104d..74b10923 100644
--- a/sekaictf2025/alterego/montgomery_isogenies/kummer_isogeny.py
+++ b/sekaictf2025/alterego/montgomery_isogenies/kummer_isogeny.py
@@ -61,7 +61,7 @@
 
 # Sage imports
 from sage.all import prod, ZZ, PolynomialRing
-from sage.rings.generic import ProductTree
+#from sage.rings.generic import ProductTree
 
 # Local imports
 from montgomery_isogenies.kummer_line import KummerLine, KummerPoint