diff --git a/Dockerfile b/Dockerfile
index 5fa23cc..b5c86c0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,6 +15,7 @@ RUN apt-get update && apt-get install -y \
     gcc-avr \
     libcurl4-openssl-dev \
     libssl-dev \
+    libffi-dev \
     python3-dev \
     python3-libgpiod \
     ### clean up