diff --git a/Dockerfile b/Dockerfile
index e3cd352cf3bffb088fa5e7589f630135d186725c..90e14498c3f1b718cc1a6957dff7fd974ef61527 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:11-slim
+FROM debian:9-slim
 
 RUN apt-get update -yqq && \
     apt-get upgrade -yqq && \
@@ -26,4 +26,4 @@ RUN mkdir build && \
 
 RUN cp build/msdf-atlas-gen /usr/bin/msdf-atlas-gen
 
-ENTRYPOINT [ "msdf-atlas-gen" ]
\ No newline at end of file
+ENTRYPOINT [ "msdf-atlas-gen" ]