diff --git a/Makefile b/Makefile
index 9cc111a..f0c8caa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 REV := master
 BASE := https://raw.githubusercontent.com/cnlohr/ch32v003fun/$(REV)/ch32fun
-CURL_FLAGS := -O -\# --fail --location --tlsv1.2 --proto =https --max-time 300
+CURL_FLAGS := -O -\# --fail --location --tlsv1.3 --proto =https --max-time 300
 
 TARGET = blink
 TARGET_MCU?=CH32V003