diff --git a/pyproject.toml b/pyproject.toml
index 22890d715..c3df9da0b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,8 +32,8 @@ license = {text="BSD"}
 dependencies = [
   "msgpack >=1.0.3, <=1.0.7",
   "packaging",
-  "platformdirs >=3.0.0, <4.0.0; sys_platform == 'darwin'",  # for macOS: breaking changes in 3.0.0,
-  "platformdirs >=2.6.0, <4.0.0; sys_platform != 'darwin'",  # for others: 2.6+ works consistently.
+  "platformdirs >=3.0.0, <5.0.0; sys_platform == 'darwin'",  # for macOS: breaking changes in 3.0.0,
+  "platformdirs >=2.6.0, <5.0.0; sys_platform != 'darwin'",  # for others: 2.6+ works consistently.
   "argon2-cffi",
 ]