diff --git a/README.md b/README.md
index d1e2f2671..ddf9e4e4b 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ The ongoing development on 2.3.x is done in this branch.
 Refer to the [OpenTX wiki](https://github.com/opentx/opentx/wiki) for information about setting up the tool chains for building OpenTX and OpenTX Companion as well as other development related issues.
 
 Useful links:
- * OpenTX Main Site http://www.open-tx.org/
+ * OpenTX Main Site https://www.open-tx.org/
  * OpenTx University http://open-txu.org/
  * OpenTX User Manual https://www.gitbook.com/book/opentx/opentx-taranis-manual/details
  * OpenTX Lua Reference Guide https://www.gitbook.com/book/opentx/opentx-lua-reference-guide/details