diff --git a/src/drivers/gps/ubx.cpp b/src/drivers/gps/ubx.cpp
index f6c3fd7882..901c761b47 100644
--- a/src/drivers/gps/ubx.cpp
+++ b/src/drivers/gps/ubx.cpp
@@ -44,8 +44,8 @@
  * @author Hannes Delago
  *   (rework, add ubx7+ compatibility)
  *
- * @see http://www.u-blox.com/images/downloads/Product_Docs/u-blox6_ReceiverDescriptionProtocolSpec_%28GPS.G6-SW-10018%29.pdf
- * @see http://www.u-blox.com/images/downloads/Product_Docs/u-bloxM8_ReceiverDescriptionProtocolSpec_%28UBX-13003221%29_Public.pdf
+ * @see https://www2.u-blox.com/images/downloads/Product_Docs/u-blox6-GPS-GLONASS-QZSS-V14_ReceiverDescriptionProtocolSpec_Public_(GPS.G6-SW-12013).pdf
+ * @see https://www.u-blox.com/sites/default/files/products/documents/u-bloxM8_ReceiverDescrProtSpec_%28UBX-13003221%29_Public.pdf
  */
 
 #include <assert.h>