diff --git a/platformio.ini b/platformio.ini
index f8a68c2..a32e8a6 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -5,9 +5,10 @@ board = ttgo-t-beam
 lib_ldf_mode = deep+
 monitor_speed = 115200
 
+#ESP8266 and ESP32 OLED driver for SSD1306 displays
 [env:ttgo-t-beam-v1]
 lib_deps = 
-	Adafruit GFX Library
+	Adafruit GFX Library@1.7.5
 	Adafruit SSD1306
 	LoRa
 	APRS-Decoder-Lib
@@ -16,7 +17,7 @@ lib_deps =
 
 [env:ttgo-t-beam-v0_7]
 lib_deps = 
-	Adafruit GFX Library
+	Adafruit GFX Library@1.7.5
 	Adafruit SSD1306
 	LoRa
 	APRS-Decoder-Lib