diff --git a/capa/main.py b/capa/main.py
index 3e4af74e..fc932576 100644
--- a/capa/main.py
+++ b/capa/main.py
@@ -392,6 +392,7 @@ class ShouldExitError(Exception):
     """raised when a main-related routine indicates the program should exit."""
 
     def __init__(self, status_code: int):
+        super().__init__(status_code)
         self.status_code = status_code
 
 
diff --git a/capa/rules/__init__.py b/capa/rules/__init__.py
index b5a0911b..da0a7d03 100644
--- a/capa/rules/__init__.py
+++ b/capa/rules/__init__.py
@@ -274,12 +274,8 @@ SUPPORTED_FEATURES[Scope.FUNCTION].update(SUPPORTED_FEATURES[Scope.BASIC_BLOCK])
 
 
 class InvalidRule(ValueError):
-    def __init__(self, msg):
-        super().__init__()
-        self.msg = msg
-
     def __str__(self):
-        return f"invalid rule: {self.msg}"
+        return f"invalid rule: {super().__str__()}"
 
     def __repr__(self):
         return str(self)
@@ -289,20 +285,15 @@ class InvalidRuleWithPath(InvalidRule):
     def __init__(self, path, msg):
         super().__init__(msg)
         self.path = path
-        self.msg = msg
         self.__cause__ = None
 
     def __str__(self):
-        return f"invalid rule: {self.path}: {self.msg}"
+        return f"invalid rule: {self.path}: {super(InvalidRule, self).__str__()}"
 
 
 class InvalidRuleSet(ValueError):
-    def __init__(self, msg):
-        super().__init__()
-        self.msg = msg
-
     def __str__(self):
-        return f"invalid rule set: {self.msg}"
+        return f"invalid rule set: {super().__str__()}"
 
     def __repr__(self):
         return str(self)
diff --git a/pyproject.toml b/pyproject.toml
index a655ca6f..9052142d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -127,7 +127,7 @@ dev = [
     "pytest-sugar==1.1.1",
     "pytest-instafail==0.5.0",
     "flake8==7.3.0",
-    "flake8-bugbear==24.12.12",
+    "flake8-bugbear==25.10.21",
     "flake8-encodings==0.5.1",
     "flake8-comprehensions==3.17.0",
     "flake8-logging-format==0.9.0",