diff --git a/sdks/python/container/base_image_requirements_manual.txt b/sdks/python/container/base_image_requirements_manual.txt
index 24cbcde2cc06..623059e40f1a 100644
--- a/sdks/python/container/base_image_requirements_manual.txt
+++ b/sdks/python/container/base_image_requirements_manual.txt
@@ -26,7 +26,7 @@
 bs4  # Commonly used HTML processing tool.
 # Don't upgrade to Cython 3.x, until it's released, stable and we have consensus
 # to upgrade. Use 0.xx for now.
-cython<1
+cython<4
 # future is no longer a Beam dependency, but is an implicit dependency in
 # some versions of libraries that lauch Beam pipelines, like tensorflow-transform.
 # Leaving 'future' in our containers for now prevent breaking tft users.