diff --git a/Dockerfile b/Dockerfile
index ad97fd6..553c754 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
-FROM registry.hottis.de/dockerized/base-build-env:1.3.0
+FROM registry.hottis.de/dockerized/base-build-env:1.5.3-bullseye
+
 
 LABEL Maintainer="Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>"
 LABEL ImageName="registry.hottis.de/dockerized/build-env-arduino"
@@ -12,7 +13,7 @@ ENV USER arduino
 
 RUN \
   apt update && \
-  apt install -y vim.tiny && \
+  apt install -y vim-tiny && \
   apt install -y python-cheetah && \
   apt install -y python3 && \
   pip install pyserial && \
@@ -37,7 +38,8 @@ RUN \
   arduino-cli core install arduino:avr && \
   arduino-cli core install arduino:samd && \
   arduino-cli core install esp8266:esp8266 && \
-  arduino-cli core install esp32:esp32
+  arduino-cli core install esp32:esp32 && \
+  arduino-cli core install Heltec-esp32:esp32
   
 
 CMD ["/bin/bash"]
diff --git a/arduino-cli.yaml b/arduino-cli.yaml
index f4aa241..5958251 100644
--- a/arduino-cli.yaml
+++ b/arduino-cli.yaml
@@ -5,4 +5,5 @@ board_manager:
   additional_urls:
   - http://arduino.esp8266.com/stable/package_esp8266com_index.json
   - https://dl.espressif.com/dl/package_esp32_index.json
+  - https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/releases/download/0.0.7/package_heltec_esp32_index.json