diff --git a/revpipyload.e4p b/revpipyload.e4p
index a87cbff..bd8ef63 100644
--- a/revpipyload.e4p
+++ b/revpipyload.e4p
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE Project SYSTEM "Project-5.1.dtd">
 <!-- eric project file for project revpipyload -->
-<!-- Saved: 2018-06-24, 10:04:03 -->
+<!-- Saved: 2018-06-27, 11:29:04 -->
 <!-- Copyright (C) 2018 Sven Sager, akira@narux.de -->
 <Project version="5.1">
   <Language>en_US</Language>
@@ -9,7 +9,7 @@
   <ProgLanguage mixed="0">Python3</ProgLanguage>
   <ProjectType>Console</ProjectType>
   <Description>Dieser Loader wird über das Init-System geladen und führt das angegebene Pythonprogramm aus. Es ist für den RevolutionPi gedacht um automatisch das SPS-Programm zu starten.</Description>
-  <Version>0.6.6</Version>
+  <Version>0.6.7</Version>
   <Author>Sven Sager</Author>
   <Email>akira@narux.de</Email>
   <Eol index="1"/>
diff --git a/revpipyload/procimgserver.py b/revpipyload/procimgserver.py
index 2b77a2c..1526771 100644
--- a/revpipyload/procimgserver.py
+++ b/revpipyload/procimgserver.py
@@ -143,7 +143,7 @@ class ProcimgServer():
         """Liefert Prozessabbild an Client.
         @return Binary() bytes or None"""
         if self.rpi.readprocimg() and self.rpi.syncoutputs():
-            bytebuff = b''
+            bytebuff = bytearray()
             for dev in self.rpi.device:
                 bytebuff += bytes(dev)
             return Binary(bytebuff)
diff --git a/revpipyload/revpipyload.py b/revpipyload/revpipyload.py
index 7c6b82c..9010f9c 100755
--- a/revpipyload/revpipyload.py
+++ b/revpipyload/revpipyload.py
@@ -50,7 +50,7 @@ from time import asctime
 from xmlrpc.client import Binary
 from xrpcserver import SaveXMLRPCServer
 
-pyloadversion = "0.6.6"
+pyloadversion = "0.6.7"
 
 
 class RevPiPyLoad():
@@ -319,7 +319,7 @@ class RevPiPyLoad():
                 self.xml_ps = None
                 proginit.logger.warning(
                     "can not load revpimodio2 module. maybe its not installed "
-                    "or an old version (required at least 2.0.5). if you "
+                    "or an old version (required at least 2.1.6). if you "
                     "like to use the process monitor feature, update/install "
                     "revpimodio2: 'apt-get install python3-revpimodio2'"
                 )
diff --git a/setup.py b/setup.py
index f61756b..1d54a13 100644
--- a/setup.py
+++ b/setup.py
@@ -27,11 +27,11 @@ setup(
 
     license="LGPLv3",
     name="revpipyload",
-    version="0.6.6",
+    version="0.6.7",
 
     scripts=["data/revpipyload"],
 
-    install_requires=["revpimodio2"],
+    install_requires=["revpimodio2 >= 2.1.6"],
     python_requires=">=3.2",
 
     data_files=[
diff --git a/stdeb.cfg b/stdeb.cfg
index b883c01..c640e0b 100644
--- a/stdeb.cfg
+++ b/stdeb.cfg
@@ -1,5 +1,5 @@
 [DEFAULT]
 Debian-Version: 1
-Depends3: python3-revpimodio2 (>= 2.0.0)
+Depends3: python3-revpimodio2 (>= 2.1.6)
 Package: revpipyload
 Suite: stable