diff --git a/nvchecker/core.py b/nvchecker/core.py
index 266413d..97827c9 100644
--- a/nvchecker/core.py
+++ b/nvchecker/core.py
@@ -122,7 +122,7 @@ class Source:
   def future_done(self, fu):
     name = fu.name
     try:
-      _, version = fu.result()
+      version = fu.result()
       if version is not None:
         self.print_version_update(name, version)
     except Exception:
diff --git a/nvchecker/get_version.py b/nvchecker/get_version.py
index 82398dc..d47ee03 100644
--- a/nvchecker/get_version.py
+++ b/nvchecker/get_version.py
@@ -19,4 +19,3 @@ async def get_version(name, conf):
       return await func(name, conf)
   else:
     logger.error('%s: no idea to get version info.', name)
-    return name, None
diff --git a/nvchecker/source/archpkg.py b/nvchecker/source/archpkg.py
index 15f8775..aac2cc0 100644
--- a/nvchecker/source/archpkg.py
+++ b/nvchecker/source/archpkg.py
@@ -16,7 +16,7 @@ async def get_version(name, conf):
 
   if not data['results']:
     logger.error('Arch package not found: %s', name)
-    return name, None
+    return
 
   r = [r for r in data['results'] if r['repo'] != 'testing'][0]
   if strip_release:
@@ -24,4 +24,4 @@ async def get_version(name, conf):
   else:
     version = r['pkgver'] + '-' + r['pkgrel']
 
-  return name, version
+  return version
diff --git a/nvchecker/source/aur.py b/nvchecker/source/aur.py
index 5327b33..79cc72d 100644
--- a/nvchecker/source/aur.py
+++ b/nvchecker/source/aur.py
@@ -16,9 +16,9 @@ async def get_version(name, conf):
 
   if not data['results']:
     logger.error('AUR upstream not found for %s', name)
-    return name, None
+    return
 
   version = data['results'][0]['Version']
   if strip_release and '-' in version:
     version = version.rsplit('-', 1)[0]
-  return name, version
+  return version
diff --git a/nvchecker/source/bitbucket.py b/nvchecker/source/bitbucket.py
index 0585f40..9e9706e 100644
--- a/nvchecker/source/bitbucket.py
+++ b/nvchecker/source/bitbucket.py
@@ -28,4 +28,4 @@ async def get_version(name, conf):
     version = data[-1]
   else:
     version = data['values'][0]['date'].split('T', 1)[0].replace('-', '')
-  return name, version
+  return version
diff --git a/nvchecker/source/cmd.py b/nvchecker/source/cmd.py
index d7c3954..dcfa307 100644
--- a/nvchecker/source/cmd.py
+++ b/nvchecker/source/cmd.py
@@ -13,6 +13,6 @@ async def get_version(name, conf):
   output = (await p.communicate())[0].strip().decode('latin1')
   if p.returncode != 0:
     logger.error('%s: command exited with %d.', name, p.returncode)
-    return name, None
+    return
 
-  return name, output
+  return output
diff --git a/nvchecker/source/cratesio.py b/nvchecker/source/cratesio.py
index 19ffceb..5d5f9fa 100644
--- a/nvchecker/source/cratesio.py
+++ b/nvchecker/source/cratesio.py
@@ -11,4 +11,4 @@ async def get_version(name, conf):
   async with session.get(API_URL % name) as res:
     data = await res.json()
   version = [v['num'] for v in data['versions'] if not v['yanked']][0]
-  return name, version
+  return version
diff --git a/nvchecker/source/debianpkg.py b/nvchecker/source/debianpkg.py
index 3d03e63..b315c99 100644
--- a/nvchecker/source/debianpkg.py
+++ b/nvchecker/source/debianpkg.py
@@ -18,7 +18,7 @@ async def get_version(name, conf):
 
   if not data.get('versions'):
     logger.error('Debian package not found: %s', name)
-    return name, None
+    return
 
   r = data['versions'][0]
   if strip_release:
@@ -26,4 +26,4 @@ async def get_version(name, conf):
   else:
     version = r['version']
 
-  return name, version
+  return version
diff --git a/nvchecker/source/github.py b/nvchecker/source/github.py
index d3a7990..d0c8506 100644
--- a/nvchecker/source/github.py
+++ b/nvchecker/source/github.py
@@ -42,4 +42,4 @@ async def get_version(name, conf):
     # YYYYMMDD.HHMMSS
     version = data[0]['commit']['committer']['date'] \
         .rstrip('Z').replace('-', '').replace(':', '').replace('T', '.')
-  return name, version
+  return version
diff --git a/nvchecker/source/gitlab.py b/nvchecker/source/gitlab.py
index 9298f55..2809f77 100644
--- a/nvchecker/source/gitlab.py
+++ b/nvchecker/source/gitlab.py
@@ -25,7 +25,7 @@ async def get_version(name, conf):
   token = conf.get('token', os.environ.get(env_name, None))
   if token is None:
     logger.error('%s: No gitlab token specified.', name)
-    return name, None
+    return
 
   if use_max_tag:
     url = GITLAB_MAX_TAG % (host, repo)
@@ -41,4 +41,4 @@ async def get_version(name, conf):
     version = data[-1]
   else:
     version = data[0]['created_at'].split('T', 1)[0].replace('-', '')
-  return name, version
+  return version
diff --git a/nvchecker/source/manual.py b/nvchecker/source/manual.py
index 5d502cf..79852be 100644
--- a/nvchecker/source/manual.py
+++ b/nvchecker/source/manual.py
@@ -2,4 +2,4 @@
 # Copyright (c) 2013-2017 lilydjwg <lilydjwg@gmail.com>, et al.
 
 async def get_version(name, conf):
-  return name, conf.get('manual')
+  return conf.get('manual')
diff --git a/nvchecker/source/pacman.py b/nvchecker/source/pacman.py
index 9166eae..3a03582 100644
--- a/nvchecker/source/pacman.py
+++ b/nvchecker/source/pacman.py
@@ -9,8 +9,8 @@ async def get_version(name, conf):
   conf['cmd'] = c
   strip_release = conf.getboolean('strip-release', False)
 
-  _, version = await cmd.get_version(name, conf)
+  version = await cmd.get_version(name, conf)
 
   if strip_release and '-' in version:
     version = version.rsplit('-', 1)[0]
-  return name, version
+  return version
diff --git a/nvchecker/source/regex.py b/nvchecker/source/regex.py
index feb9d1b..fd8b66e 100644
--- a/nvchecker/source/regex.py
+++ b/nvchecker/source/regex.py
@@ -15,7 +15,7 @@ async def get_version(name, conf):
     regex = re.compile(conf['regex'])
   except sre_constants.error:
     logger.warn('%s: bad regex, skipped.', name, exc_info=True)
-    return name, None
+    return
 
   encoding = conf.get('encoding', 'latin1')
 
@@ -34,4 +34,4 @@ async def get_version(name, conf):
     except ValueError:
       version = None
       logger.error('%s: version string not found.', name)
-    return name, version
+    return version
diff --git a/nvchecker/source/simple_json.py b/nvchecker/source/simple_json.py
index f70deea..e0dceb3 100644
--- a/nvchecker/source/simple_json.py
+++ b/nvchecker/source/simple_json.py
@@ -15,6 +15,6 @@ def simple_json(urlpat, confkey, version_from_json):
     async with session.get(url, **kwargs) as res:
       data = await res.json()
     version = version_from_json(data)
-    return name, version
+    return version
 
   return get_version
diff --git a/nvchecker/source/ubuntupkg.py b/nvchecker/source/ubuntupkg.py
index 35f8366..b6fa40b 100644
--- a/nvchecker/source/ubuntupkg.py
+++ b/nvchecker/source/ubuntupkg.py
@@ -25,7 +25,7 @@ async def get_version(name, conf):
 
     if not data.get('entries'):
       logger.error('Ubuntu package not found: %s', name)
-      return name, None
+      return
 
     releases = [r for r in data["entries"] if r["status"] == "Published"]
 
@@ -39,10 +39,11 @@ async def get_version(name, conf):
 
   if not releases:
     logger.error('Ubuntu package not found: %s', name)
+    return
 
   if strip_release:
     version = releases[0]['source_package_version'].split("-")[0]
   else:
     version = releases[0]['source_package_version']
 
-  return name, version
+  return version
diff --git a/nvchecker/source/vcs.py b/nvchecker/source/vcs.py
index 28d663f..e1fffac 100644
--- a/nvchecker/source/vcs.py
+++ b/nvchecker/source/vcs.py
@@ -39,16 +39,16 @@ async def get_version(name, conf):
   output = (await p.communicate())[0].strip().decode('latin1')
   if p.returncode != 0:
     logger.error('%s: command exited with %d.', name, p.returncode)
-    return name, None
+    return
   else:
     if use_max_tag:
       data = [tag for tag in output.split("\n") if tag not in ignored_tags]
       data.sort(key=parse_version)
       version = data[-1]
-      return name, version
+      return version
     else:
       oldver = _parse_oldver(oldver)
       if output == oldver[2]:
-        return name, None
+        return
       else:
-        return name, "%d.%d.%s" % (oldver[0], oldver[1] + 1, output)
+        return "%d.%d.%s" % (oldver[0], oldver[1] + 1, output)
diff --git a/tests/conftest.py b/tests/conftest.py
index 988fac3..dd56b13 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -13,7 +13,7 @@ async def get_version():
             _config.read_dict({name: config})
             config = _config[name]
 
-        return (await _get_version(name, config))[1]
+        return await _get_version(name, config)
 
     return __call__