diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 39a9d55..0b9aed5 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -3,7 +3,7 @@ current_version = 0.0.0
 commit = False
 tag = True
 tag_name = {new_version}
-message = Bump version: {current_version} -> {new_version}
+tag_message = Bump version: {current_version} -> {new_version}
 
 [bumpversion:file:semver/__init__.py]
 search = version = '{current_version}'
diff --git a/semver/__init__.py b/semver/__init__.py
index 6866a88..e413dfe 100644
--- a/semver/__init__.py
+++ b/semver/__init__.py
@@ -103,17 +103,17 @@ class SemVer(object):
         with open(".bumpversion.cfg", "r") as file:
             config_file = file.read()
         # Update .bumpconfig
-        pattern = re.compile("current_version = [0-9.]*")
-        current_config = re.search(pattern, config_file)
-        if current_config:
-            config_file.replace(current_config.group(0), "current_version = " + get_tag_version())
-        else:
-            config_file.replace("[bumpversion]","[bumpversion]\ncurrent_version = " + get_tag_version())
-        with open(".bumpversion.cfg", "w") as file:
-            file.write(config_file)
+        #pattern = re.compile("current_version = [0-9.]*")
+        #current_config = re.search(pattern, config_file)
+        #if current_config:
+            #config_file.replace(current_config.group(0), "current_version = " + get_tag_version())
+        #else:
+            #config_file.replace("[bumpversion]","[bumpversion]\ncurrent_version = " + get_tag_version())
+        #with open(".bumpversion.cfg", "w") as file:
+            #file.write(config_file)
 
         # version repo
-        p = subprocess.Popen(['bumpversion', self.version_type],
+        p = subprocess.Popen(['bumpversion', '--current-version', get_tag_version(), self.version_type],
                              cwd='.')
         p.wait()
         return self
diff --git a/semver/merged_branch.py b/semver/merged_branch.py
deleted file mode 100644
index e69de29..0000000
diff --git a/setup.py b/setup.py
index c6053f6..9c9f5cb 100644
--- a/setup.py
+++ b/setup.py
@@ -98,7 +98,7 @@ setup(
     # requirements files see:
     # https://packaging.python.org/en/latest/requirements.html
     install_requires=[
-        'bumpversion==0.5.3',
+        'bump2version>=0.5.11',
         'argparse>=1.2.1'
     ],