diff --git a/base/nmh:dev b/base/nmh:dev
index cdda4b09fe5d58c61e9ead4483bd6409602700dd..04c9088aa08c8bfe00fbfa463ab13435b6028f78 100644
--- a/base/nmh:dev
+++ b/base/nmh:dev
@@ -1,4 +1,4 @@
-FROM docker.km3net.de/jpp-root6-py2:v11.0.0-rc8
+FROM docker.km3net.de/jpp-root6-py2:v12.1.2
  MAINTAINER Tamas Gal <tgal@km3net.de>
   
  RUN yum install -y gsl-devel && yum clean -y all