diff --git a/CITATION.cff b/CITATION.cff
index 78dfdad..fd4e81e 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -3,6 +3,7 @@
 
 cff-version: 1.2.0
 title: OPF-Gym
+date-released: 2024
 message: >-
   If you use this software, please cite it using the
   metadata from this file. Additionally, please check out the publication