diff --git a/dvc/dirs.py b/dvc/dirs.py
index 59223b767..c6737678d 100644
--- a/dvc/dirs.py
+++ b/dvc/dirs.py
@@ -21,6 +21,19 @@ def global_config_dir():
 
 
 def site_cache_dir():
+    from platformdirs import PlatformDirs
+    from platformdirs.unix import Unix
+
+    if issubclass(Unix, PlatformDirs):
+        # Return the cache directory shared by users, e.g. `/var/tmp/$appname`
+        # NOTE: platformdirs>=5 changed `site_cache_dir` to return /var/cache/$appname.
+        # as the following path is considered insecure.
+        # For details, see: https://github.com/tox-dev/platformdirs/pull/239
+
+        # FIXME: keeping the old behavior temporarily to avoid dependency conflict.
+        #        In the future, consider migrating to a more secure directory.
+        return f"/var/tmp/{APPNAME}"  # noqa: S108
+
     return os.getenv(env.DVC_SITE_CACHE_DIR) or platformdirs.site_cache_dir(
         APPNAME, APPAUTHOR, opinion=True
     )
diff --git a/pyproject.toml b/pyproject.toml
index 4a72156d8..7bc860c08 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ dependencies = [
     "omegaconf",
     "packaging>=19",
     "pathspec>=0.10.3",
-    "platformdirs<4,>=3.1.1",
+    "platformdirs<5,>=3.1.1",
     "psutil>=5.8",
     "pydot>=1.2.4",
     "pygtrie>=2.3.2",
diff --git a/tests/unit/test_dirs.py b/tests/unit/test_dirs.py
index 5ae2acba0..0098c0cbf 100644
--- a/tests/unit/test_dirs.py
+++ b/tests/unit/test_dirs.py
@@ -1,4 +1,8 @@
-from dvc.dirs import global_config_dir
+import sys
+
+import pytest
+
+from dvc.dirs import global_config_dir, site_cache_dir
 from dvc.env import DVC_GLOBAL_CONFIG_DIR
 
 
@@ -6,3 +10,8 @@ def test_global_config_dir_respects_env_var(monkeypatch):
     path = "/some/random/path"
     monkeypatch.setenv(DVC_GLOBAL_CONFIG_DIR, path)
     assert global_config_dir() == path
+
+
+@pytest.mark.skipif(sys.platform != "linux", reason="Only for Unix platforms")
+def test_site_cache_dir_on_unix():
+    assert site_cache_dir() == "/var/tmp/dvc"