diff --git a/mozjs-sys/Cargo.toml b/mozjs-sys/Cargo.toml
index 050f6957135..654ae45f1ef 100644
--- a/mozjs-sys/Cargo.toml
+++ b/mozjs-sys/Cargo.toml
@@ -2,7 +2,7 @@
 name = "mozjs_sys"
 description = "System crate for the Mozilla SpiderMonkey JavaScript engine."
 repository.workspace = true
-version = "0.140.5-5"
+version = "0.140.5-6"
 authors = ["Mozilla", "The Servo Project Developers"]
 links = "mozjs"
 license.workspace = true
diff --git a/mozjs-sys/etc/patches/0045-python-deprecated.patch b/mozjs-sys/etc/patches/0045-python-deprecated.patch
new file mode 100644
index 00000000000..abc70e1d0fe
--- /dev/null
+++ b/mozjs-sys/etc/patches/0045-python-deprecated.patch
@@ -0,0 +1,62 @@
+diff --git a/python/mozbuild/mozbuild/frontend/reader.py b/python/mozbuild/mozbuild/frontend/reader.py
+index 9f6292cb909de..89bf9995c1768 100644
+--- a/python/mozbuild/mozbuild/frontend/reader.py
++++ b/python/mozbuild/mozbuild/frontend/reader.py
+@@ -470,7 +470,7 @@ def c(new_node):
+             return c(
+                 ast.Subscript(
+                     value=c(ast.Name(id=self._global_name, ctx=ast.Load())),
+-                    slice=c(ast.Index(value=c(ast.Str(s=node.id)))),
++                    slice=c(ast.Index(value=c(ast.Constant(value=node.id)))),
+                     ctx=node.ctx,
+                 )
+             )
+@@ -1039,8 +1039,8 @@ def assigned_variable(node):
+                 else:
+                     # Others
+                     assert isinstance(target.slice, ast.Index)
+-                    assert isinstance(target.slice.value, ast.Str)
+-                    key = target.slice.value.s
++                    assert isinstance(target.slice.value, ast.Constant)
++                    key = target.slice.value.value
+             elif isinstance(target, ast.Attribute):
+                 assert isinstance(target.attr, str)
+                 key = target.attr
+@@ -1051,11 +1051,11 @@ def assigned_values(node):
+             value = node.value
+             if isinstance(value, ast.List):
+                 for v in value.elts:
+-                    assert isinstance(v, ast.Str)
+-                    yield v.s
++                    assert isinstance(v, ast.Constant)
++                    yield v.value
+             else:
+-                assert isinstance(value, ast.Str)
+-                yield value.s
++                assert isinstance(value, ast.Constant)
++                yield value.value
+ 
+         assignments = []
+ 
+diff --git a/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py b/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py
+index cfcc0f18b9a9a..de06b58819b6a 100644
+--- a/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py
++++ b/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py
+@@ -327,15 +327,13 @@ def assignment_node_to_source_filename_list(code, node):
+     """
+     if isinstance(node.value, ast.List) and "elts" in node.value._fields:
+         for f in node.value.elts:
+-            if not isinstance(f, ast.Constant) and not isinstance(f, ast.Str):
++            if not isinstance(f, ast.Constant):
+                 log(
+                     "Found non-constant source file name in list: ",
+                     ast_get_source_segment(code, f),
+                 )
+                 return []
+-        return [
+-            f.value if isinstance(f, ast.Constant) else f.s for f in node.value.elts
+-        ]
++        return [f.value for f in node.value.elts]
+     elif isinstance(node.value, ast.ListComp):
+         # SOURCES += [f for f in foo if blah]
+         log("Could not find the files for " + ast_get_source_segment(code, node.value))
diff --git a/mozjs-sys/mozjs/python/mozbuild/mozbuild/frontend/reader.py b/mozjs-sys/mozjs/python/mozbuild/mozbuild/frontend/reader.py
index 9f6292cb909..89bf9995c17 100644
--- a/mozjs-sys/mozjs/python/mozbuild/mozbuild/frontend/reader.py
+++ b/mozjs-sys/mozjs/python/mozbuild/mozbuild/frontend/reader.py
@@ -470,7 +470,7 @@ def c(new_node):
             return c(
                 ast.Subscript(
                     value=c(ast.Name(id=self._global_name, ctx=ast.Load())),
-                    slice=c(ast.Index(value=c(ast.Str(s=node.id)))),
+                    slice=c(ast.Index(value=c(ast.Constant(value=node.id)))),
                     ctx=node.ctx,
                 )
             )
@@ -1039,8 +1039,8 @@ def assigned_variable(node):
                 else:
                     # Others
                     assert isinstance(target.slice, ast.Index)
-                    assert isinstance(target.slice.value, ast.Str)
-                    key = target.slice.value.s
+                    assert isinstance(target.slice.value, ast.Constant)
+                    key = target.slice.value.value
             elif isinstance(target, ast.Attribute):
                 assert isinstance(target.attr, str)
                 key = target.attr
@@ -1051,11 +1051,11 @@ def assigned_values(node):
             value = node.value
             if isinstance(value, ast.List):
                 for v in value.elts:
-                    assert isinstance(v, ast.Str)
-                    yield v.s
+                    assert isinstance(v, ast.Constant)
+                    yield v.value
             else:
-                assert isinstance(value, ast.Str)
-                yield value.s
+                assert isinstance(value, ast.Constant)
+                yield value.value
 
         assignments = []
 
diff --git a/mozjs-sys/mozjs/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py b/mozjs-sys/mozjs/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py
index cfcc0f18b9a..de06b58819b 100644
--- a/mozjs-sys/mozjs/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py
+++ b/mozjs-sys/mozjs/python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py
@@ -327,15 +327,13 @@ def assignment_node_to_source_filename_list(code, node):
     """
     if isinstance(node.value, ast.List) and "elts" in node.value._fields:
         for f in node.value.elts:
-            if not isinstance(f, ast.Constant) and not isinstance(f, ast.Str):
+            if not isinstance(f, ast.Constant):
                 log(
                     "Found non-constant source file name in list: ",
                     ast_get_source_segment(code, f),
                 )
                 return []
-        return [
-            f.value if isinstance(f, ast.Constant) else f.s for f in node.value.elts
-        ]
+        return [f.value for f in node.value.elts]
     elif isinstance(node.value, ast.ListComp):
         # SOURCES += [f for f in foo if blah]
         log("Could not find the files for " + ast_get_source_segment(code, node.value))