diff --git a/pyproject.toml b/pyproject.toml
index 3950d7a..49129d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ requires-python = ">=3.9"
 dynamic = ["version"]
 dependencies = [
     "gitpython>3",
-    "dulwich>=0.24.0",
+    "dulwich>=0.24.3",
     "pygit2>=1.14.0",
     "pygtrie>=2.3.2",
     "fsspec[tqdm]>=2024.2.0",
diff --git a/src/scmrepo/git/backend/dulwich/__init__.py b/src/scmrepo/git/backend/dulwich/__init__.py
index 654f760..bb30972 100644
--- a/src/scmrepo/git/backend/dulwich/__init__.py
+++ b/src/scmrepo/git/backend/dulwich/__init__.py
@@ -369,18 +369,13 @@ def _expand_paths(self, paths: list[str], force: bool = False) -> Iterator[str]:
                     yield rel
 
     def commit(self, msg: str, no_verify: bool = False):
-        from dulwich import __version__ as dulwich_version
         from dulwich.errors import CommitError
         from dulwich.porcelain import Error, TimezoneFormatError, commit
         from dulwich.repo import InvalidUserIdentity
 
-        commit_kwargs: dict[str, Any] = {}
-        if dulwich_version >= (0, 24, 3):
-            commit_kwargs["sign"] = False
-
         with reraise((Error, CommitError), SCMError("Git commit failed")):
             try:
-                commit(self.repo, message=msg, no_verify=no_verify, **commit_kwargs)
+                commit(self.repo, message=msg, no_verify=no_verify, sign=False)
             except InvalidUserIdentity as exc:
                 raise SCMError("Git username and email must be configured") from exc
             except TimezoneFormatError as exc: