diff --git a/.zenodo.json b/.zenodo.json
index 2aeafda5f3..f6d26b97f3 100644
--- a/.zenodo.json
+++ b/.zenodo.json
@@ -3,7 +3,7 @@
     "title": "Hi-PACE/hipace: v21.11",
     "version": "v21.11",
     "upload_type": "software",
-    "publication_date": "2021.11-01",
+    "publication_date": "2021-11-01",
     "creators": [
         {
             "affiliation": "Deutsches Elektronen-Synchrotron, previously LBNL",