diff --git a/Dockerfile.m4 b/Dockerfile.m4
index af83b61..5147f26 100644
--- a/Dockerfile.m4
+++ b/Dockerfile.m4
@@ -118,7 +118,7 @@ RUN make deb
 RUN dpkg -i ./virtualgl_*.deb
 
 # Build TurboVNC
-ARG TURBOVNC_TREEISH=3.0.3
+ARG TURBOVNC_TREEISH=3.1
 ARG TURBOVNC_REMOTE=https://github.com/TurboVNC/turbovnc.git
 RUN mkdir /tmp/turbovnc/
 WORKDIR /tmp/turbovnc/