diff --git a/mainnet/singularity/Dockerfile b/mainnet/singularity/Dockerfile
index 9d0e9937f..f987026f8 100644
--- a/mainnet/singularity/Dockerfile
+++ b/mainnet/singularity/Dockerfile
@@ -35,7 +35,7 @@ WORKDIR /code
 
 # docker build --build-arg CACHEBUST=$(date +%s) .
 ARG CACHEBUST=1
-RUN git clone --branch mainnet_config https://github.com/QuarkChain/pyquarkchain.git
+RUN git clone https://github.com/QuarkChain/pyquarkchain.git
 
 # py dep
 RUN pypy3 -m pip install -r pyquarkchain/requirements.txt