PDFBOX-3989: fix url from http to https
diff --git a/_config.yml b/_config.yml
index 7ea88f1..8a5264b 100644
--- a/_config.yml
+++ b/_config.yml
@@ -6,7 +6,7 @@
   and the ability to extract content from documents. Apache PDFBox also includes several
   command-line utilities. Apache PDFBox is published under the Apache License v2.0.
 baseurl: ""
-url: "http://pdfbox.apache.org/"
+url: "https://pdfbox.apache.org/"
 
 
 # Build settings
@@ -19,4 +19,4 @@
 markdown_ext: "markdown,mkdown,mkdn,mkd,md,mdtext"
 
 encoding: UTF-8
-markdown: kramdown
\ No newline at end of file
+markdown: kramdown