diff --git a/debian/control b/debian/control
index b5ea18954..19e4adf93 100644
--- a/debian/control
+++ b/debian/control
@@ -41,7 +41,7 @@ Depends: apache2,
  pwgen,
  python,
  rabbitmq-server,
- silan,
+ silan (>= 0.3.0~),
  sudo,
  sysv-rc, 
  tar (>= 1.22),
diff --git a/python_apps/pypo/media/update/silananalyzer.py b/python_apps/pypo/media/update/silananalyzer.py
index 5054c98d7..38a7f9ecb 100644
--- a/python_apps/pypo/media/update/silananalyzer.py
+++ b/python_apps/pypo/media/update/silananalyzer.py
@@ -42,7 +42,7 @@ class SilanAnalyzer(Thread):
                 full_path = f['fp']
                 # silence detect(set default queue in and out)
                 try:
-                    command = ['silan', '-b', '-f', 'JSON', full_path]
+                    command = ['nice', '-n', '19', 'silan', '-b', '-f', 'JSON', full_path]
                     proc = subprocess.Popen(command, stdout=subprocess.PIPE)
                     out = proc.communicate()[0].strip('\r\n')
                     info = json.loads(out)