diff --git a/Dockerfile b/Dockerfile
index f96eefe..fb907e8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ RUN : \
  && apt-get install -y pkg-config \
  && apt-get autoremove -y \
  && rm -rf /var/lib/apt/lists/*
-RUN git clone --depth 1 -b v1.18 https://github.com/micropython/micropython.git /src
+RUN git clone --depth 1 -b v1.17 https://github.com/micropython/micropython.git /src
 RUN cd /src/mpy-cross && make
 RUN cd /src/ports/unix && make submodules && make
 RUN cd /src/ports/esp32 && bash -c "source /opt/esp/idf/export.sh && make"