diff --git a/kallithea/lib/middleware/pygrack.py b/kallithea/lib/middleware/pygrack.py
--- a/kallithea/lib/middleware/pygrack.py
+++ b/kallithea/lib/middleware/pygrack.py
@@ -30,6 +30,8 @@ import os
 import socket
 import traceback
 
+from dulwich.server import update_server_info
+from dulwich.web import GunzipFilter, LimitedInputFilter
 from webob import Request, Response, exc
 
 import kallithea
@@ -168,7 +170,6 @@ class GitRepository(object):
         if git_command in ['git-receive-pack']:
             # updating refs manually after each push.
             # Needed for pre-1.7.0.4 git clients using regular HTTP mode.
-            from dulwich.server import update_server_info
 
             from kallithea.lib.vcs import get_repo
             repo = get_repo(self.content_path)
@@ -224,6 +225,5 @@ class GitDirectory(object):
 
 
 def make_wsgi_app(repo_name, repo_root):
-    from dulwich.web import GunzipFilter, LimitedInputFilter
     app = GitDirectory(repo_root, repo_name)
     return GunzipFilter(LimitedInputFilter(app))
diff --git a/kallithea/lib/vcs/backends/git/changeset.py b/kallithea/lib/vcs/backends/git/changeset.py
--- a/kallithea/lib/vcs/backends/git/changeset.py
+++ b/kallithea/lib/vcs/backends/git/changeset.py
@@ -5,6 +5,7 @@ from subprocess import PIPE, Popen
 
 from dulwich import objects
 from dulwich.config import ConfigFile
+from dulwich.walk import Walker
 
 from kallithea.lib.vcs.backends.base import BaseChangeset, EmptyChangeset
 from kallithea.lib.vcs.conf import settings
@@ -294,7 +295,6 @@ class GitChangeset(BaseChangeset):
 
         """
         self._get_filectx(path)
-        from dulwich.walk import Walker
         include = [self.raw_id]
         walker = Walker(self.repository._repo.object_store, include,
                         paths=[path], max_entries=1)
diff --git a/kallithea/lib/vcs/backends/git/repository.py b/kallithea/lib/vcs/backends/git/repository.py
--- a/kallithea/lib/vcs/backends/git/repository.py
+++ b/kallithea/lib/vcs/backends/git/repository.py
@@ -23,6 +23,7 @@ import mercurial.util  # import url as h
 from dulwich.config import ConfigFile
 from dulwich.objects import Tag
 from dulwich.repo import NotGitRepository, Repo
+from dulwich.server import update_server_info
 
 from kallithea.lib.vcs import subprocessio
 from kallithea.lib.vcs.backends.base import BaseRepository, CollectionGenerator
@@ -661,7 +662,6 @@ class GitRepository(BaseRepository):
         """
         runs gits update-server-info command in this repo instance
         """
-        from dulwich.server import update_server_info
         try:
             update_server_info(self._repo)
         except OSError as e: