diff --git a/Dockerfile.m4 b/Dockerfile.m4
index 3f70ef6..216eee3 100644
--- a/Dockerfile.m4
+++ b/Dockerfile.m4
@@ -95,7 +95,7 @@ RUN make deb
 RUN dpkg -i ./libjpeg-turbo_*.deb
 
 # Build VirtualGL
-ARG VIRTUALGL_TREEISH=3.1beta1
+ARG VIRTUALGL_TREEISH=3.1
 ARG VIRTUALGL_REMOTE=https://github.com/VirtualGL/virtualgl.git
 RUN mkdir /tmp/virtualgl/
 WORKDIR /tmp/virtualgl/