diff --git a/pylsp_ruff/plugin.py b/pylsp_ruff/plugin.py
index 4a05017..699acb2 100644
--- a/pylsp_ruff/plugin.py
+++ b/pylsp_ruff/plugin.py
@@ -655,6 +655,9 @@ def build_check_arguments(
                 continue
             args.append(f"--ignore={','.join(errors)}")
 
+    if settings.isolated:
+        args.append("--isolated")
+
     if extra_arguments:
         args.extend(extra_arguments)
 
@@ -709,6 +712,9 @@ def build_format_arguments(
     if settings.target_version:
         args.append(f"--target-version={settings.target_version}")
 
+    if settings.isolated:
+        args.append("--isolated")
+
     if extra_arguments:
         args.extend(extra_arguments)
 
diff --git a/pylsp_ruff/settings.py b/pylsp_ruff/settings.py
index c274dac..bc14fba 100644
--- a/pylsp_ruff/settings.py
+++ b/pylsp_ruff/settings.py
@@ -33,6 +33,9 @@ class PluginSettings:
 
     target_version: Optional[str] = None
 
+    # For testing only
+    isolated: bool = False
+
 
 def to_camel_case(snake_str: str) -> str:
     components = snake_str.split("_")
diff --git a/pyproject.toml b/pyproject.toml
index 1290059..3b12afe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "python-lsp-ruff"
 authors = [
   {name = "Julian Hossbach", email = "julian.hossbach@gmx.de"}
 ]
-version = "2.3.3"
+version = "2.3.4"
 description = "Ruff linting plugin for pylsp"
 readme = "README.md"
 requires-python = ">=3.8"
diff --git a/tests/test_code_actions.py b/tests/test_code_actions.py
index 9d97d58..84b82a1 100644
--- a/tests/test_code_actions.py
+++ b/tests/test_code_actions.py
@@ -24,6 +24,7 @@ def workspace(tmp_path):
     """Return a workspace."""
     ws = Workspace(tmp_path.absolute().as_uri(), Mock())
     ws._config = Config(ws.root_uri, {}, 0, {})
+    ws._config.update({"plugins": {"ruff": {"isolated": True}}})
     return ws
 
 
@@ -79,7 +80,7 @@ def test_ruff_code_actions(workspace):
     _, doc = temp_document(codeaction_str, workspace)
 
     workspace._config.update(
-        {"plugins": {"ruff": {"select": ["F"], "unsafeFixes": True}}}
+        {"plugins": {"ruff": {"isolated": True, "select": ["F"], "unsafeFixes": True}}}
     )
     diags = ruff_lint.pylsp_lint(workspace, doc)
     range_ = cattrs.unstructure(
@@ -97,7 +98,11 @@ def test_ruff_code_actions_unfixable(workspace):
     _, doc = temp_document(codeaction_str, workspace)
 
     workspace._config.update(
-        {"plugins": {"ruff": {"select": ["F"], "unfixable": ["F841"]}}}
+        {
+            "plugins": {
+                "ruff": {"isolated": True, "select": ["F"], "unfixable": ["F841"]}
+            }
+        }
     )
     diags = ruff_lint.pylsp_lint(workspace, doc)
     range_ = cattrs.unstructure(
@@ -116,6 +121,7 @@ def test_import_action(workspace):
         {
             "plugins": {
                 "ruff": {
+                    "isolated": True,
                     "extendSelect": ["I"],
                     "extendIgnore": ["F"],
                 }
@@ -153,6 +159,7 @@ def f():
         {
             "plugins": {
                 "ruff": {
+                    "isolated": True,
                     "unsafeFixes": True,
                 }
             }
@@ -167,6 +174,7 @@ def f():
         {
             "plugins": {
                 "ruff": {
+                    "isolated": True,
                     "unsafeFixes": False,
                 }
             }
diff --git a/tests/test_ruff_format.py b/tests/test_ruff_format.py
index 3d7ef85..03f278a 100644
--- a/tests/test_ruff_format.py
+++ b/tests/test_ruff_format.py
@@ -52,6 +52,7 @@ def workspace(tmp_path):
     """Return a workspace."""
     ws = Workspace(tmp_path.absolute().as_uri(), Mock())
     ws._config = Config(ws.root_uri, {}, 0, {})
+    ws._config.update({"plugins": {"ruff": {"isolated": True}}})
     return ws
 
 
@@ -100,7 +101,11 @@ def test_ruff_format_only(workspace):
 def test_ruff_format_disabled(workspace):
     _, doc = temp_document(_UNFORMATTED_CODE, workspace)
     workspace._config.update(
-        {"plugins": {"ruff": {"format": ["I001"], "formatEnabled": False}}}
+        {
+            "plugins": {
+                "ruff": {"isolated": True, "format": ["I001"], "formatEnabled": False}
+            }
+        }
     )
     got = run_plugin_format(workspace, doc)
     assert got == ""
@@ -114,6 +119,7 @@ def test_ruff_format_and_sort_imports(workspace):
         {
             "plugins": {
                 "ruff": {
+                    "isolated": True,
                     "format": ["I001"],
                 }
             }
diff --git a/tests/test_ruff_lint.py b/tests/test_ruff_lint.py
index aaca79b..81c1de6 100644
--- a/tests/test_ruff_lint.py
+++ b/tests/test_ruff_lint.py
@@ -34,6 +34,7 @@ def workspace(tmp_path):
     """Return a workspace."""
     ws = Workspace(tmp_path.absolute().as_uri(), Mock())
     ws._config = Config(ws.root_uri, {}, 0, {})
+    ws._config.update({"plugins": {"ruff": {"isolated": True}}})
     return ws