diff --git a/platformio.ini b/platformio.ini
index 9fd1e58..cf33bd8 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -15,3 +15,7 @@ framework = arduino
 
 ; Set monitor baud rate
 monitor_speed = 9600
+
+; External libraries
+lib_deps =
+    embeddedartistry/LibPrintf@1.2.13