diff --git a/apps/cic-signer/Dockerfile b/apps/cic-signer/Dockerfile
index 46365bfb..3a09d0ff 100644
--- a/apps/cic-signer/Dockerfile
+++ b/apps/cic-signer/Dockerfile
@@ -4,6 +4,8 @@ FROM $DOCKER_REGISTRY/cic-base-images:python-3.8.6-dev-55da5f4e as dev
 
 WORKDIR /root
 
+RUN apt-get install libffi-dev -y
+
 COPY requirements.txt . 
 
 ARG EXTRA_PIP_INDEX_URL="https://pip.grassrootseconomics.net:8433"