diff --git a/data/references.json b/data/references.json
index 9209de4..6d732d0 100644
--- a/data/references.json
+++ b/data/references.json
@@ -1825,7 +1825,7 @@
   },
   {
     "DOI": "10.1016/j.aap.2016.06.003",
-    "URL": "http://dx.doi.org/10.1016/j.aap.2016.06.003",
+    "URL": "https://doi.org/10.1016/j.aap.2016.06.003",
     "author": [
       {
         "family": "Vollrath",
diff --git a/static/references.bib b/static/references.bib
index f3d0479..22b5268 100644
--- a/static/references.bib
+++ b/static/references.bib
@@ -552,7 +552,7 @@ @misc{RN120
    series = {Series Do German drivers use their smartphones safely?—Not really!},
    volume = {96},
    pages = {29-38},
-   url = {http://dx.doi.org/10.1016/j.aap.2016.06.003},
+   url = {https://doi.org/10.1016/j.aap.2016.06.003},
    doi = {10.1016/j.aap.2016.06.003},
    year = {2016},
    type = {Conference Paper}
diff --git a/static/references.json b/static/references.json
index 9209de4..6d732d0 100644
--- a/static/references.json
+++ b/static/references.json
@@ -1825,7 +1825,7 @@
   },
   {
     "DOI": "10.1016/j.aap.2016.06.003",
-    "URL": "http://dx.doi.org/10.1016/j.aap.2016.06.003",
+    "URL": "https://doi.org/10.1016/j.aap.2016.06.003",
     "author": [
       {
         "family": "Vollrath",