diff --git a/ennstatus/cli/commands/config.py b/ennstatus/cli/commands/config.py
--- a/ennstatus/cli/commands/config.py
+++ b/ennstatus/cli/commands/config.py
@@ -40,7 +40,9 @@ def server():
 @click.pass_obj
 def add(obj, name, ips, password):
 
-    config = json.load(obj['config_file'])
+    with obj['config_file'].open() as f:
+        config = json.load(f)
+
     name = name.lower()
     ips = [ip.strip() for ip in ips.split(',')]
 
@@ -61,7 +63,7 @@ def add(obj, name, ips, password):
         'PASSWORD': password
     }
 
-    with open(obj['config_file'], mode='w', encoding='utf-8') as f:
+    with obj['config_file'].open(mode='w', encoding='utf-8') as f:
         json.dump(config, f, indent=4, sort_keys=True)
 
 
@@ -70,7 +72,8 @@ def add(obj, name, ips, password):
 @click.pass_obj
 def delete(obj, name):
 
-    config = json.load(obj['config_file'])
+    with obj['config_file'].open() as f:
+        config = json.load(f)
     name = name.lower()
 
     try:
@@ -78,5 +81,5 @@ def delete(obj, name):
     except KeyError:
         raise SystemExit('{} does not exists!'.format(name))
 
-    with open(obj['config_file'], mode='w', encoding='utf-8') as f:
+    with obj['config_file'].open(mode='w', encoding='utf-8') as f:
         json.dump(config, f, indent=4, sort_keys=True)