diff --git a/CITATION.cff b/CITATION.cff
index c988552..6cbb4b8 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -9,6 +9,6 @@ authors:
   family-names: Verhoeven
   affiliation: Nederlands eScience Center
 version: 1.4.3
-date-released: '2018-02-10'
+date-released: 2018-02-10
 repository-code: https://github.com/3D-e-Chem/3D-e-Chem-VM
 license: Apache-2.0