diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 82c7a7b..e78d390 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -39,7 +39,7 @@ repos:
         args:
           - --msg-filename
   - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
-    rev: 2.7.2
+    rev: 2.7.3
     hooks:
       - id: editorconfig-checker
   - repo: https://github.com/jumanjihouse/pre-commit-hooks
@@ -51,7 +51,7 @@ repos:
     hooks:
       - id: actionlint
   - repo: https://github.com/adrienverge/yamllint
-    rev: v1.32.0
+    rev: v1.33.0
     hooks:
       - id: yamllint
   - repo: https://github.com/executablebooks/mdformat
@@ -74,7 +74,7 @@ repos:
         additional_dependencies:
           - markdown-it-texmath
   - repo: https://github.com/psf/black
-    rev: 23.9.1
+    rev: 23.11.0
     hooks:
       - id: black
   - repo: https://github.com/PyCQA/isort
@@ -88,7 +88,7 @@ repos:
         additional_dependencies:
           - tomli
   - repo: https://github.com/kumaraditya303/mirrors-pyright
-    rev: v1.1.329
+    rev: v1.1.335
     hooks:
       - id: pyright
   - repo: https://github.com/PyCQA/bandit
diff --git a/requirements.txt b/requirements.txt
index 495496b..915cbe7 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 #!/usr/bin/env -S pip install -r
 
 tree-sitter-languages
-tree-sitter-lsp
+tree-sitter-lsp >= 0.0.4
diff --git a/src/autotools_language_server/finders.py b/src/autotools_language_server/finders.py
index 4bf35e3..3a63f50 100644
--- a/src/autotools_language_server/finders.py
+++ b/src/autotools_language_server/finders.py
@@ -145,6 +145,7 @@ def __init__(self, node: Node) -> None:
         parent = node.parent
         if parent is None:
             raise TypeError
+        self.is_define = lambda _: False
         if parent.type == "arguments":
             self.is_define = self.is_function_define
             # https://github.com/alemuller/tree-sitter-make/issues/8
@@ -158,8 +159,6 @@ def __init__(self, node: Node) -> None:
             self.is_define = self.is_variable_define
         elif parent.type == "prerequisites":
             self.is_define = self.is_target_define
-        else:
-            raise NotImplementedError
 
     def is_function_define(self, uni: UNI) -> bool:
         r"""Is function define.
@@ -255,14 +254,13 @@ def __init__(self, node: Node) -> None:
         parent = node.parent
         if parent is None:
             raise TypeError
+        self.is_reference = lambda _: False
         if parent.type == "define_directive":
             self.is_reference = self.is_function_reference
         elif parent.type == "variable_assignment":
             self.is_reference = self.is_variable_reference
         elif parent.type == "prerequisites":
             self.is_reference = self.is_target_reference
-        else:
-            raise NotImplementedError
 
     def is_function_reference(self, uni: UNI) -> bool:
         r"""Is function reference.