diff --git a/Dockerfile b/Dockerfile
index 80a4ea5..5af32d3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,10 +12,12 @@ RUN git clone --depth 1 https://gitlab.com/fdroid/fdroidserver.git \
     && python3 setup.py install
 
 # Install additional utilities required by actual builds (list subject to future expansion)
+# build-tools 32.0.0 is needed for a good apksigner
 RUN apt-get update && apt-get install --yes \
 		patch \
 		autoconf libtool pkg-config \
 		gradle ant \
+	&& echo y | $ANDROID_HOME/tools/bin/sdkmanager "build-tools;32.0.0" \
 	&& apt-get clean && rm -rf /var/lib/apt/lists/*
 
 VOLUME ["/repo"]