diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8e631fe..b0f0ff5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -5,7 +5,7 @@ repos:
       - id: black
         language_version: python3
     repo: https://github.com/ambv/black
-    rev: 24.4.0
+    rev: 24.8.0
   - hooks:
       - id: isort
         language_version: python3
@@ -21,4 +21,4 @@ repos:
           - flake8-docstrings
           - flake8-string-format
     repo: https://github.com/pycqa/flake8
-    rev: 7.0.0
+    rev: 7.1.1
diff --git a/itemloaders/__init__.py b/itemloaders/__init__.py
index d90d5f4..5f037a7 100644
--- a/itemloaders/__init__.py
+++ b/itemloaders/__init__.py
@@ -219,7 +219,7 @@ def add_value(
         """
         value = self.get_value(value, *processors, re=re, **kw)
         if value is None:
-            return
+            return self
         if not field_name:
             for k, v in value.items():
                 self._add_value(k, v)
@@ -244,7 +244,7 @@ def replace_value(
         """
         value = self.get_value(value, *processors, re=re, **kw)
         if value is None:
-            return
+            return self
         if not field_name:
             for k, v in value.items():
                 self._replace_value(k, v)
diff --git a/tox.ini b/tox.ini
index ee32ddb..09de7a1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,8 +40,8 @@ commands =
 [testenv:twinecheck]
 basepython = python3
 deps =
-    twine==5.0.0
-    build==1.2.1
+    twine==5.1.1
+    build==1.2.2
 commands =
     python -m build --sdist
     twine check dist/*
@@ -49,8 +49,15 @@ commands =
 [testenv:typing]
 basepython = python3
 deps =
-    mypy==1.10.0
-    types-attrs==19.1.0
+    mypy==1.11.2
+    attrs>=18.2.0
     types-jmespath==1.0.2.20240106
 commands =
     mypy --strict --ignore-missing-imports --implicit-reexport {posargs:itemloaders tests}
+
+[testenv:pre-commit]
+basepython = python3
+deps =
+    pre-commit
+commands =
+    pre-commit run {posargs:--all-files}