diff --git a/Dockerfile.test b/Dockerfile.test
index 4d2fe39..ac8e14c 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -1,8 +1,8 @@
 ARG COMPILE_R7RS=chibi
 FROM schemers/sagittarius AS build
 RUN apt-get update && apt-get install -y build-essential git make cmake libgc-dev zlib1g-dev libffi-dev libssl-dev
-RUN git clone https://bitbucket.org/ktakashi/sagittarius-scheme.git --branch=version_0.9.12 --depth=1
-RUN cd sagittarius-scheme && ./dist.sh gen && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX=/usr/local-other .. && make && make install
+RUN wget https://github.com/ktakashi/sagittarius-scheme/archive/refs/tags/version_0.9.12.tar.gz
+RUN cd sagittarius-scheme-version_0.9.12 && ./dist.sh gen && mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX=/usr/local-other .. && make && make install
 
 FROM schemers/${COMPILE_R7RS}
 RUN apt-get update && apt-get install -y \