diff --git a/.gitmodules b/.gitmodules
index b817e3c7..4feeb379 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,6 @@
 [submodule "periodfind"]
 	path = periodfind
-	url = https://github.com/ejaszewski/periodfind.git
+	url = https://github.com/ZwickyTransientFacility/periodfind.git
 [submodule "scope-phenomenology"]
 	path = scope-phenomenology
 	url = https://github.com/bfhealy/scope-phenomenology.git