diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index fb6f057..d5e5e75 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -26,7 +26,7 @@ jobs:
         python -m pip install -e git+https://github.com/Mathics3/mathics-scanner#egg=Mathics-Scanner[full]
         python -m pip install -e git+https://github.com/Mathics3/mathics-core#egg=Mathics3[full]
         python -m pip install -e .
-        (cd src/mathics3 && bash ./admin-tools/make-op-tables.sh)
+        (cd src/mathics3 && bash ./admin-tools/make-JSON-tables.sh)
     - name: install pymathics graph
       run: |
         make develop
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e8e521e..2ac7b58 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -2,27 +2,22 @@ default_language_version:
   python: python
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
+    rev: v4.5.0
     hooks:
     - id: check-merge-conflict
     - id: debug-statements
-      stages: [commit]
+      stages: [pre-commit]
     - id: end-of-file-fixer
-      stages: [commit]
-# -   repo: https://github.com/pycqa/isort
-#     rev: 5.10.1
-#     hooks:
-#       - id: isort
-#         stages: [commit]
+      stages: [pre-commit]
+-   repo: https://github.com/pycqa/isort
+    rev: 5.13.2
+    hooks:
+      - id: isort
+        stages: [pre-commit]
 -   repo: https://github.com/psf/black
-    rev: 22.3.0
+    rev: 24.10.0
     hooks:
     - id: black
       language_version: python3
       exclude: 'pymathics/graph/version.py'
-      stages: [commit]
--   repo: https://github.com/pycqa/flake8
-    rev: 3.9.2
-    hooks:
-      - id: flake8
-        stages: [commit]
+      stages: [pre-commit]
diff --git a/pymathics/graph/__init__.py b/pymathics/graph/__init__.py
index 05e7341..17c9e9b 100644
--- a/pymathics/graph/__init__.py
+++ b/pymathics/graph/__init__.py
@@ -60,7 +60,6 @@
     VertexIndex,
     VertexList,
 )
-
 from pymathics.graph.centralities import (
     BetweennessCentrality,
     ClosenessCentrality,
@@ -70,7 +69,6 @@
     KatzCentrality,
     PageRankCentrality,
 )
-
 from pymathics.graph.components import ConnectedComponents, WeaklyConnectedComponents
 from pymathics.graph.curated import GraphData
 from pymathics.graph.measures_and_metrics import (
@@ -99,6 +97,7 @@
     AcyclicGraphQ,
     ConnectedGraphQ,
     DirectedGraphQ,
+    GraphQ,
     LoopFreeGraphQ,
     MixedGraphQ,
     MultigraphQ,
@@ -151,6 +150,7 @@
     "GraphBox",
     "GraphData",
     "GraphDistance",
+    "GraphQ",
     "HITSCentrality",
     "HighlightGraph",
     "HknHararyGraph",
diff --git a/pymathics/graph/properties.py b/pymathics/graph/properties.py
index 2e9e94a..7d85b19 100644
--- a/pymathics/graph/properties.py
+++ b/pymathics/graph/properties.py
@@ -52,7 +52,7 @@ class AcyclicGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if is a graph is acyclic"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "AcyclicGraphQ[graph_, OptionsPattern[AcyclicGraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=False)
         if not graph or graph.empty():
@@ -73,7 +73,7 @@ class ConnectedGraphQ(_NetworkXBuiltin):
 #Connected_vertices_and_graphs
     </url> test (<url>
     :NetworkX:
-https://networkx.org/documentation/networkx-2.8.8/reference/algorithms\
+https://networkx.org/documentation/stable/reference/algorithms\
 /generated/networkx.algorithms.components.is_connected.html
     </url>, <url>
     :WMA:
@@ -111,7 +111,7 @@ class ConnectedGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph is a connected"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "%(name)s[graph_, OptionsPattern[%(name)s]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if graph:
@@ -127,7 +127,7 @@ class DirectedGraphQ(_NetworkXBuiltin):
     https://en.wikipedia.org/wiki/Directed_graph
     </url> test (<url>
     :NetworkX:
-    https://networkx.org/documentation/networkx-2.8.8/reference\
+    https://networkx.org/documentation/stable/reference\
 /generated/networkx.classes.function.is_directed.html
     </url>, <url>
     :WMA:
@@ -153,7 +153,7 @@ class DirectedGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph is directed"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "DirectedGraphQ[graph_, OptionsPattern[DirectedGraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if graph:
@@ -162,6 +162,31 @@ def eval(self, graph, expression, evaluation, options):
             return SymbolFalse
 
 
+class GraphQ(_NetworkXBuiltin):
+    """
+    <url>:WMA link:
+    https://reference.wolfram.com/language/ref/GraphQ.html</url>
+    <dl>
+      <dt>'GraphQ'[$graph$]
+      <dd>True if $graph$ is a 'Graph'.
+    </dl>
+
+    A graph with one one node and one self-looping edge:
+    >> GraphQ[{1 -> 2, 2 -> 3, 3 -> 1}]
+     = True
+
+    >> GraphQ[{1, 2, 3}]
+     = False
+    """
+
+    summary_text = "test object is a graph"
+
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
+        "GraphQ[graph_, OptionsPattern[GraphQ]]"
+        graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
+        return SymbolTrue if graph else SymbolFalse
+
+
 class LoopFreeGraphQ(_NetworkXBuiltin):
     """
     <url>
@@ -169,7 +194,7 @@ class LoopFreeGraphQ(_NetworkXBuiltin):
     https://en.wikipedia.org/wiki/Loop_(graph_theory)
     </url> test (<url>
     :NetworkX:
-    https://networkx.org/documentation/networkx-2.8.8/reference/\
+    https://networkx.org/documentation/stable/reference/\
 generated/networkx.classes.function.nodes_with_selfloops.html
     </url>, <url>
     :WMA:
@@ -195,7 +220,7 @@ class LoopFreeGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph is loop free"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "LoopFreeGraphQ[graph_, OptionsPattern[LoopFreeGraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if not graph or graph.empty():
@@ -240,7 +265,7 @@ class MixedGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph has directed and undirected edges"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "MixedGraphQ[graph_, OptionsPattern[MixedGraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if graph:
@@ -254,7 +279,7 @@ class MultigraphQ(_NetworkXBuiltin):
     :Multigraph:
     https://en.wikipedia.org/wiki/Multigraph</url> test (<url>
     :NetworkX:
-https://networkx.org/documentation/networkx-2.8.8/reference/classes/multigraph.html</url>, \
+https://networkx.org/documentation/stable/reference/classes/multigraph.html</url>, \
     <url>
     :WMA:
     https://reference.wolfram.com/language/ref/MulitGraphQ.html</url>)
@@ -281,7 +306,7 @@ class MultigraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph is a multi graph"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "MultigraphQ[graph_, OptionsPattern[MultigraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if graph:
@@ -339,7 +364,7 @@ class PathGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph is a path-like graph"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "PathGraphQ[graph_, OptionsPattern[PathGraphQ]]"
         if not isinstance(graph, Graph) or graph.empty():
             return SymbolFalse
@@ -365,7 +390,7 @@ class PlanarGraphQ(_NetworkXBuiltin):
         :Planar Graph:
         https://en.wikipedia.org/wiki/Planar_graph</url> test (<url>
         :NetworkX:
-        https://networkx.org/documentation/networkx-2.8.8/reference/algorithms/
+        https://networkx.org/documentation/stable/reference/algorithms/
     generated/networkx.algorithms.planarity.check_planarity.html</url>, <url>
         :WMA:
         https://reference.wolfram.com/language/ref/PlanaGraphQ.html</url>)
@@ -436,7 +461,7 @@ class SimpleGraphQ(_NetworkXBuiltin):
 
     summary_text = "test if a graph is simple (not multigraph)"
 
-    def eval(self, graph, expression, evaluation, options):
+    def eval(self, graph, expression, evaluation: Evaluation, options: dict):
         "SimpleGraphQ[graph_, OptionsPattern[LoopFreeGraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if graph:
diff --git a/pymathics/graph/random.py b/pymathics/graph/random.py
index 90c35c9..13455b8 100644
--- a/pymathics/graph/random.py
+++ b/pymathics/graph/random.py
@@ -2,6 +2,8 @@
 Random Graphs
 """
 
+from typing import Any, Generator
+
 import networkx as nx
 from mathics.builtin.numbers.randomnumbers import RandomEnv
 from mathics.core.atoms import Integer, Integer1
@@ -36,7 +38,7 @@ class RandomGraph(_NetworkXBuiltin):
 
     def _generate(
         self, n: Integer, m: Integer, k: Integer, evaluation: Evaluation, options: dict
-    ) -> Graph:
+    ) -> Generator[Any, Any, Any]:
         py_n = n.value
         py_m = m.value
         py_k = k.value
@@ -64,6 +66,6 @@ def eval_nmk(
         expression,
         evaluation: Evaluation,
         options: dict,
-    ) -> Graph:
+    ) -> ListExpression:
         "RandomGraph[{n_Integer, m_Integer}, k_Integer, OptionsPattern[RandomGraph]]"
         return ListExpression(*self._generate(n, m, k, evaluation, options))