diff --git a/requirements.txt b/requirements.txt
index 683ece601..5abb972f1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,4 +51,4 @@ scikit-learn==1.7.1
 zarr==3.1.2 ; python_version >= '3.11'
 numcodecs==0.16.2 ; python_version >= '3.11'
 fastuuid==0.14.0
-dulwich>=0.22,<2
+dulwich>=1.2.6,<2