diff --git a/bin/micropython b/bin/micropython
index 60afe37..3a2b595 100755
Binary files a/bin/micropython and b/bin/micropython differ
diff --git a/tools/Dockerfile b/tools/Dockerfile
index 56fa90d..e2ff9ac 100644
--- a/tools/Dockerfile
+++ b/tools/Dockerfile
@@ -1,23 +1,21 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && \
-    apt-get install -y build-essential libffi-dev git pkg-config python python3 && \
+    apt-get install -y build-essential libffi-dev git pkg-config python3 && \
     rm -rf /var/lib/apt/lists/* && \
     git clone https://github.com/micropython/micropython.git && \
     cd micropython && \
-    git checkout v1.15 && \
     git submodule update --init && \
     cd mpy-cross && \
     make && \
     cd .. && \
     cd ports/unix && \
-    make axtls && \
     make && \
     make test && \
     make install && \
-    apt-get purge --auto-remove -y  build-essential libffi-dev git pkg-config python python3 && \
+    apt-get purge --auto-remove -y  build-essential libffi-dev git pkg-config python3 && \
     cd ../../.. && \
     rm -rf micropython