diff --git a/pkgs/by-name/py/pympress/issue-330-gprops-iter-actually-iterable.patch b/pkgs/by-name/py/pympress/issue-330-gprops-iter-actually-iterable.patch
new file mode 100644
index 000000000000..4449daeda189
--- /dev/null
+++ b/pkgs/by-name/py/pympress/issue-330-gprops-iter-actually-iterable.patch
@@ -0,0 +1,11 @@
+--- i/pympress/builder.py
++++ w/pympress/builder.py
+@@ -76,7 +76,7 @@ class Builder(Gtk.Builder):
+         Args:
+             a_widget (:class:`~GObject.Object`): an object built by the builder, usually a widget
+         """
+-        for str_prop in (prop.name for prop in a_widget.props if prop.value_type == GObject.TYPE_STRING):
++        for str_prop in (prop.name for prop in list(a_widget.props) if prop.value_type == GObject.TYPE_STRING):
+             try:
+                 str_val = getattr(a_widget.props, str_prop)
+                 if str_val:
diff --git a/pkgs/by-name/py/pympress/package.nix b/pkgs/by-name/py/pympress/package.nix
index e93c371b2808..00516db13471 100644
--- a/pkgs/by-name/py/pympress/package.nix
+++ b/pkgs/by-name/py/pympress/package.nix
@@ -30,6 +30,13 @@ python3Packages.buildPythonApplication rec {
     babel
   ];
 
+  patches = [
+    # Workaround for a bug on Python >= 3.13+ and pygobject < 3.51.
+    # This can go away once nixpkgs is using pygobject >= 3.51.
+    # See <https://github.com/Cimbali/pympress/issues/330> for details.
+    ./issue-330-gprops-iter-actually-iterable.patch
+  ];
+
   dependencies =
     with python3Packages;
     [