diff --git a/Dockerfile b/Dockerfile
index 1ccced1..4a2bbf5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,9 @@ RUN apk add --no-cache gcc g++ musl-dev libc-dev cmake git samurai coreutils rpm
 
 RUN mkdir -p /usr/src/yerbacon
 WORKDIR /usr/src/
-RUN git clone --quiet -n --branch devel4 https://github.com/upx/upx/
+ARG BRANCH="devel4"
+ADD https://api.github.com/repos/upx/upx/git/refs/heads/$BRANCH version.json
+RUN git clone --quiet -n --branch $BRANCH https://github.com/upx/upx/
 ARG CMAKE_BUILD_TYPE="Release"
 WORKDIR ./upx
 RUN git checkout --quiet 70f14101ed79642e39340fde8514aa19a99f32dc