diff --git a/nextflow_schema.json b/nextflow_schema.json
index 79a69ce..a411519 100644
--- a/nextflow_schema.json
+++ b/nextflow_schema.json
@@ -1,5 +1,5 @@
 {
-    "$schema": "http://json-schema.org/draft-07/schema",
+    "$schema": "https://json-schema.org/draft-07/schema",
     "$id": "https://raw.githubusercontent.com/nf-core/sammyseq/master/nextflow_schema.json",
     "title": "nf-core/sammyseq pipeline parameters",
     "description": "analysis pipeline for SAMMY-seq",