diff --git a/Dockerfile b/Dockerfile
index b945275af0804bf9bdb65a2386962bd4bfb27d3e..2653d8a76886e32384d98306dd7bc97e2d27b52d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM sagemath/sagemath:9.2
+FROM sagemath/sagemath:9.1-py3
 USER root
 RUN apt-get -qq update \
  && apt-get -qq install -y git \