diff --git a/variants/m5stack_coreink/platformio.ini b/variants/m5stack_coreink/platformio.ini
index 9b41675e4..2a0eda96e 100644
--- a/variants/m5stack_coreink/platformio.ini
+++ b/variants/m5stack_coreink/platformio.ini
@@ -12,7 +12,7 @@ build_flags =
 lib_deps = 
   ${esp32_base.lib_deps}
   zinggjm/GxEPD2@^1.4.9
-  lewisxhe/PCF8563_Library@^0.0.1
+  https://github.com/lewisxhe/PCF8563_Library.git#91399f254651537c5ab338dacc7c10d1f087fd09
 board_build.f_cpu = 240000000L
 upload_protocol = esptool
 upload_port = /dev/ttyACM*