diff --git a/oncall/bin/oncall.py b/oncall/bin/oncall.py
index 8d4ce6d7..4041f6a0 100755
--- a/oncall/bin/oncall.py
+++ b/oncall/bin/oncall.py
@@ -105,7 +105,7 @@ def get_csv_from_server():
 parser.add_argument('-d', '--debug', action='store_true', default=False, required=False)
 args = parser.parse_args()
 
-api_url = _check_mk_url(_site_url()) + 'api/v0'
+api_url = _check_mk_url(_site_url()) + 'api/1.0'
 if not args.secret:
     args.username, args.secret = _site_creds(args.username)
 
@@ -263,7 +263,7 @@ def gen_id():
         site = changes_file.split('/')[-1][20:-3]
         if site != os.environ.get('OMD_SITE'):
             try:
-                cmk.utils.store.aquire_lock(changes_file)
+                cmk.utils.store.acquire_lock(changes_file)
                 with open(changes_file, 'a+') as f:
                     f.write(repr(change_spec)+'\0')
                     f.flush()
@@ -290,6 +290,7 @@ def gen_id():
         json=postdata,
         headers={
             "Content-Type": 'application/json',
+            "If-Match": '*',
         },
         allow_redirects=False,
     )
diff --git a/oncall/oncall-3.0.3.mkp b/oncall/oncall-3.0.3.mkp
deleted file mode 100644
index 5c6ade3f..00000000
Binary files a/oncall/oncall-3.0.3.mkp and /dev/null differ
diff --git a/oncall/oncall-4.0.1.mkp b/oncall/oncall-4.0.1.mkp
new file mode 100644
index 00000000..3be5c3a5
Binary files /dev/null and b/oncall/oncall-4.0.1.mkp differ