diff --git a/README.md b/README.md
index dffd3e1..c845baf 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,6 @@ If you use the materials provided in this repository, please cite the following
      doi = {10.5281/zenodo.10027851},
      month = oct,
      title = {{virtual CAT: An app for algorithmic thinking assessment within Swiss compulsory education}},
-     doi = {10.5281/zenodo.10027851},
      note = {Zenodo Software. \url{https://doi.org/10.5281/zenodo.10027851}},
      year = {2023}
    }