diff --git a/rhodecode/lib/system_info.py b/rhodecode/lib/system_info.py
--- a/rhodecode/lib/system_info.py
+++ b/rhodecode/lib/system_info.py
@@ -220,7 +220,7 @@ def ulimit_info():
         ('open files', get_resource(resource.RLIMIT_NOFILE)),
     ])
 
-    text = ', '.join('{}:{}'.format(k, v) for k, v in data.items())
+    text = ', '.join(f'{k}:{v}' for k, v in data.items())
 
     value = {
         'limits': data,
@@ -299,7 +299,7 @@ def machine_load():
     # load averages
     if hasattr(psutil.os, 'getloadavg'):
         value.update(dict(
-            zip(['1_min', '5_min', '15_min'], psutil.os.getloadavg())
+            list(zip(['1_min', '5_min', '15_min'], psutil.os.getloadavg()))
         ))
 
     human_value = value.copy()