diff --git a/nvchecker_source/go.py b/nvchecker_source/go.py
index 00a017b..7ddfa5c 100644
--- a/nvchecker_source/go.py
+++ b/nvchecker_source/go.py
@@ -4,33 +4,33 @@
 from lxml import html
 
 from nvchecker.api import (
-    VersionResult, Entry, AsyncCache, KeyManager,
-    session, GetVersionError, HTTPError
+  VersionResult, Entry, AsyncCache, KeyManager,
+  session, GetVersionError,
 )
 
 GO_PKG_URL = 'https://pkg.go.dev/{pkg}?tab=versions'
 
 
 async def get_version(
-        name: str, conf: Entry, *,
-        cache: AsyncCache, keymanager: KeyManager,
-        **kwargs,
+    name: str, conf: Entry, *,
+    cache: AsyncCache, keymanager: KeyManager,
+    **kwargs,
 ) -> VersionResult:
-    key = tuple(sorted(conf.items()))
-    return await cache.get(key, get_version_impl)
+  key = tuple(sorted(conf.items()))
+  return await cache.get(key, get_version_impl)
 
 
 async def get_version_impl(info) -> VersionResult:
-    conf = dict(info)
-    pkg_name = conf.get('go')
+  conf = dict(info)
+  pkg_name = conf.get('go')
 
-    url = GO_PKG_URL.format(pkg=pkg_name)
-    res = await session.get(url)
-    doc = html.fromstring(res.body.decode())
+  url = GO_PKG_URL.format(pkg=pkg_name)
+  res = await session.get(url)
+  doc = html.fromstring(res.body.decode())
 
-    elements = doc.xpath("//div[@class='Version-tag']/a/text()")
-    try:
-        version = elements[0]
-        return version
-    except IndexError:
-        raise GetVersionError("parse error", pkg_name=pkg_name)
+  elements = doc.xpath("//div[@class='Version-tag']/a/text()")
+  try:
+    version = elements[0]
+    return version
+  except IndexError:
+    raise GetVersionError("parse error", pkg_name=pkg_name)
diff --git a/tests/test_go.py b/tests/test_go.py
index b0d39aa..9b9b348 100644
--- a/tests/test_go.py
+++ b/tests/test_go.py
@@ -5,32 +5,32 @@ import pytest
 
 from nvchecker.api import HTTPError
 
-lxml_available = True
 try:
-    import lxml
+  import lxml
+  lxml_available = True
 except ImportError:
-    lxml_available = False
+  lxml_available = False
 
 pytestmark = [
-    pytest.mark.asyncio(scope="session"),
-    pytest.mark.needs_net,
-    pytest.mark.skipif(not lxml_available, reason="needs lxml")
+  pytest.mark.asyncio(scope="session"),
+  pytest.mark.needs_net,
+  pytest.mark.skipif(not lxml_available, reason="needs lxml")
 ]
 
 
 async def test_go(get_version):
-    assert await get_version("one version", {
-        "source": "go",
-        "go": "github.com/caddyserver/replace-response",
-    }) == "v0.0.0-20231221003037-a85d4ddc11d6"
+  assert await get_version("one version", {
+    "source": "go",
+    "go": "github.com/caddyserver/replace-response",
+  }) == "v0.0.0-20231221003037-a85d4ddc11d6"
 
-    assert await get_version("multiple version", {
-        "source": "go",
-        "go": "github.com/corazawaf/coraza-caddy",
-    }) == "v1.2.2"
+  assert await get_version("multiple version", {
+    "source": "go",
+    "go": "github.com/corazawaf/coraza-caddy",
+  }) == "v1.2.2"
 
-    with pytest.raises(HTTPError):
-        await get_version("not found", {
-            "source": "go",
-            "go": "github.com/asdas/sadfasdf",
-        })
+  with pytest.raises(HTTPError):
+    await get_version("not found", {
+      "source": "go",
+      "go": "github.com/asdas/sadfasdf",
+    })