diff --git a/environment.yml b/environment.yml
index 8211aa4a8a5405cab37087b7f26efb1257297da5..e40a9430e094109e3c9794fdccdb6c86303b5d48 100644
--- a/environment.yml
+++ b/environment.yml
@@ -23,7 +23,7 @@ dependencies:
   - pip:
     - tqdm==4.66.1
     - PyNAFF==1.1.5
-  #  - Cython==3.0.5
+    - Cython==3.0.5
     - PyHEADTAIL==1.16.1
   #  - cpymad ==1.14.2
   #  - pysixtrack ==0.0.6