diff --git a/.github/unittest/linux_libs/scripts_d4rl/environment.yml b/.github/unittest/linux_libs/scripts_d4rl/environment.yml
index 567ab175d7a..862a148ec87 100644
--- a/.github/unittest/linux_libs/scripts_d4rl/environment.yml
+++ b/.github/unittest/linux_libs/scripts_d4rl/environment.yml
@@ -17,3 +17,4 @@ dependencies:
     - pyyaml
     - scipy
     - hydra-core
+    - cython<3