diff --git a/signald-builder.Dockerfile b/signald-builder.Dockerfile
index 00beb9a..7152fb4 100644
--- a/signald-builder.Dockerfile
+++ b/signald-builder.Dockerfile
@@ -12,6 +12,7 @@ RUN apt-get update && apt-get install -y \
   git-buildpackage \
   gradle-debian-helper \
   jq \
+  aptly \
   && rm -rf /var/lib/apt/lists/*
 RUN adduser signald
 COPY deb-scripts/release-deb.sh /usr/bin/release-deb