diff --git a/pdm.lock b/pdm.lock
index 6f3e070..239a914 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -5,7 +5,7 @@
 groups = ["default", "coverage", "dev", "docs", "lint", "mutagen", "mypy", "safety", "tests", "typeguard", "xdoctest"]
 strategy = ["cross_platform"]
 lock_version = "4.5.0"
-content_hash = "sha256:275bc0f10a4226784a2ac18da0a24b9f6bd1c1a0543c3d1a723452702d3cd006"
+content_hash = "sha256:388f771f18958b21a2565ab7b4f858846f728cdd5ffa44c95184385d33dfd833"
 
 [[metadata.targets]]
 requires_python = "~=3.9"
@@ -1284,15 +1284,12 @@ files = [
 
 [[package]]
 name = "platformdirs"
-version = "3.11.0"
-requires_python = ">=3.7"
-summary = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-dependencies = [
-    "typing-extensions>=4.7.1; python_version < \"3.8\"",
-]
+version = "4.3.6"
+requires_python = ">=3.8"
+summary = "A small Python package for determining appropriate platform-specific dirs, e.g. a `user data dir`."
 files = [
-    {file = "platformdirs-3.11.0-py3-none-any.whl", hash = "sha256:e9d171d00af68be50e9202731309c4e658fd8bc76f55c11c7dd760d023bda68e"},
-    {file = "platformdirs-3.11.0.tar.gz", hash = "sha256:cf8ee52a3afdb965072dcc652433e0c7e3e40cf5ea1477cd4b3b1d2eb75495b3"},
+    {file = "platformdirs-4.3.6-py3-none-any.whl", hash = "sha256:73e575e1408ab8103900836b97580d5307456908a03e92031bab39e4554cc3fb"},
+    {file = "platformdirs-4.3.6.tar.gz", hash = "sha256:357fb2acbc885b0419afd3ce3ed34564c13c9b95c89360cd9563f73aa5e2b907"},
 ]
 
 [[package]]
diff --git a/pyproject.toml b/pyproject.toml
index 625ead4..c42c3f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -96,7 +96,7 @@ dependencies = [
     "cryptography<42.0.0,>=41.0.5",
     "ruamel-yaml<1.0.0,>=0.18.0",
     "tqdm<5.0.0,>=4.64.1",
-    "platformdirs<4.0.0,>=3.11.0",
+    "platformdirs<4.4.0,>=4.3.6",
     "tomli<3.0.0,>=2.0.1; python_version < \"3.11\"",
 ]
 name = "dlsite-utils"