diff --git a/ci/build-arduino.sh b/ci/build-arduino.sh
index 6bce5e2..b4ee387 100644
--- a/ci/build-arduino.sh
+++ b/ci/build-arduino.sh
@@ -13,8 +13,7 @@ export PATH=$PATH:$GITHUB_WORKSPACE/bin
 curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
 arduino-cli config init
 arduino-cli config set library.enable_unsafe_install true
-arduino-cli core update-index --additional-urls https://arduino.esp8266.com/stable/package_esp8266com_index.json
-arduino-cli core update-index --additional-urls https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+arduino-cli core update-index --config-file arduino-cli.yaml
 arduino-cli core update-index
 
 # Install Arduino AVR core