diff --git a/index.html b/index.html
index b56589d..b84e22f 100644
--- a/index.html
+++ b/index.html
@@ -97,7 +97,7 @@
CodeMeta generator v3.0
- such as ISBNs, GTIN codes, UUIDs, etc. see http://schema.org/identifier
+ such as ISBNs, GTIN codes, UUIDs, etc. see https://schema.org/identifier