diff --git a/requirements/requirements-test-optional.txt b/requirements/requirements-test-optional.txt
index 6eb06fe..4b3aba0 100644
--- a/requirements/requirements-test-optional.txt
+++ b/requirements/requirements-test-optional.txt
@@ -1,4 +1,4 @@
 numpy==1.26.1
-pymongo==4.5.0; implementation_name=='cpython'
+pymongo==4.6.1; implementation_name=='cpython'
 redis==5.0.1
 zarr==2.16.1; platform_system!='Windows'