diff --git a/grml_build/Dockerfile b/grml_build/Dockerfile
index 8c2f86c..88ebadd 100644
--- a/grml_build/Dockerfile
+++ b/grml_build/Dockerfile
@@ -5,7 +5,7 @@ FROM docker.mgm.sipwise.com/sipwise-buster:latest
 # is updated with the current date. It will force refresh of all
 # of the base images and things like `apt-get update` won't be using
 # old cached versions when the Dockerfile is built.
-ENV REFRESHED_AT 2020-06-04
+ENV REFRESHED_AT 2020-06-05
 
 # tools for building and testing
 RUN apt-get update && apt-get install --assume-yes --no-install-recommends \
@@ -25,6 +25,7 @@ RUN apt-get update && apt-get install --assume-yes --no-install-recommends \
   moreutils \
   mtools \
   pciutils \
+  procps \
   qemu-system-x86 \
   rsync \
   socat \