diff --git a/Dockerfile b/Dockerfile
index fc2bb29..1ccced1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ WORKDIR /usr/src/
 RUN git clone --quiet -n --branch devel4 https://github.com/upx/upx/
 ARG CMAKE_BUILD_TYPE="Release"
 WORKDIR ./upx
-RUN git checkout --quiet HEAD
+RUN git checkout --quiet 70f14101ed79642e39340fde8514aa19a99f32dc
 RUN git submodule --quiet update --init
 RUN mkdir -p ./build/release
 WORKDIR ./build/release