diff --git a/Makefile b/Makefile
index c33fabf..bcc6ba1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 test:
-	python test_simpleeval.py
+	python -Werror test_simpleeval.py
 
 autotest:
 	find . -name \*.py -not -path .\/.v\* | entr make test
diff --git a/simpleeval.py b/simpleeval.py
index 2839129..57e27b8 100644
--- a/simpleeval.py
+++ b/simpleeval.py
@@ -60,6 +60,7 @@
 - koenigsley (Mikhail Yeremeyev) documentation typos correction.
 - kurtmckee (Kurt McKee) Infrastructure updates
 - edgarrmondragon (Edgar Ramírez-Mondragón) Address Python 3.12+ deprecation warnings
+- cedk (Cédric Krier) <ced@b2ck.com> Allow running tests with Werror
 
 -------------------------------------
 Basic Usage:
@@ -370,16 +371,18 @@ def __init__(self, operators=None, functions=None, names=None):
             ast.Constant: self._eval_constant,
         }
 
-        # py3.12 deprecated ast.Num, ast.Str, ast.NameConstant
-        # https://docs.python.org/3.12/whatsnew/3.12.html#deprecated
-        if Num := getattr(ast, "Num"):
-            self.nodes[Num] = self._eval_num
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore")
+            # py3.12 deprecated ast.Num, ast.Str, ast.NameConstant
+            # https://docs.python.org/3.12/whatsnew/3.12.html#deprecated
+            if Num := getattr(ast, "Num"):
+                self.nodes[Num] = self._eval_num
 
-        if Str := getattr(ast, "Str"):
-            self.nodes[Str] = self._eval_str
+            if Str := getattr(ast, "Str"):
+                self.nodes[Str] = self._eval_str
 
-        if NameConstant := getattr(ast, "NameConstant"):
-            self.nodes[NameConstant] = self._eval_constant
+            if NameConstant := getattr(ast, "NameConstant"):
+                self.nodes[NameConstant] = self._eval_constant
 
         # Defaults:
 
diff --git a/test_simpleeval.py b/test_simpleeval.py
index 6152706..26c0d3a 100644
--- a/test_simpleeval.py
+++ b/test_simpleeval.py
@@ -210,6 +210,7 @@ class TestEvaluator(DRYTest):
     def test_only_evalutate_first_statement(self):
         # it only evaluates the first statement:
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("11; x = 21; x + x", 11)
         self.assertIsInstance(ws[0].message, simpleeval.MultipleExpressions)
 
@@ -791,6 +792,7 @@ def test_none(self):
         # or if you attempt to assign an unknown name to another
         with self.assertRaises(NameNotDefined):
             with warnings.catch_warnings(record=True) as ws:
+                warnings.simplefilter("always")
                 self.t("s += a", 21)
         self.assertIsInstance(ws[0].message, simpleeval.AssignmentAttempted)
 
@@ -816,6 +818,7 @@ def test_dict(self):
 
         # however, you can't assign to those names:
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("a = 200", 200)
         self.assertIsInstance(ws[0].message, simpleeval.AssignmentAttempted)
 
@@ -826,6 +829,7 @@ def test_dict(self):
         self.s.names["b"] = [0]
 
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("b[0] = 11", 11)
         self.assertIsInstance(ws[0].message, simpleeval.AssignmentAttempted)
 
@@ -849,6 +853,7 @@ def test_dict(self):
         # you still can't assign though:
 
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("c['b'] = 99", 99)
         self.assertIsInstance(ws[0].message, simpleeval.AssignmentAttempted)
 
@@ -859,6 +864,7 @@ def test_dict(self):
         self.s.names["c"]["c"] = {"c": 11}
 
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("c['c']['c'] = 21", 21)
         self.assertIsInstance(ws[0].message, simpleeval.AssignmentAttempted)
 
@@ -874,6 +880,7 @@ def test_dict_attr_access(self):
         self.t("a.b.c*2", 84)
 
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("a.b.c = 11", 11)
         self.assertIsInstance(ws[0].message, simpleeval.AssignmentAttempted)
 
@@ -881,6 +888,7 @@ def test_dict_attr_access(self):
 
         # TODO: Wat?
         with warnings.catch_warnings(record=True) as ws:
+            warnings.simplefilter("always")
             self.t("a.d = 11", 11)
 
         with self.assertRaises(KeyError):