diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 613aee132..6dd9f7467 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -40,7 +40,7 @@ jobs:
       - uses: actions/checkout@v4.0.0
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.12.1
+        uses: pypa/cibuildwheel@v2.16.2
         # to supply options, put them in 'env', like:
         env:
           MACOSX_DEPLOYMENT_TARGET: "10.14"
@@ -86,7 +86,7 @@ jobs:
         with:
           user: __token__
           # To test:
-          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
-          repository-url: https://test.pypi.org/legacy/
+          # password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          # repository-url: https://test.pypi.org/legacy/
           # To release:
-          # password: ${{ secrets.PYPI_API_TOKEN }}
+          password: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/python/src/utils/interval.cpp b/python/src/utils/interval.cpp
index 488bd24d1..4e98a2c4c 100644
--- a/python/src/utils/interval.cpp
+++ b/python/src/utils/interval.cpp
@@ -45,14 +45,16 @@ void define_interval(py::module_& m)
         .def(
             "__str__",
             [](const Interval& self) {
-                return (std::stringstream() << self).str();
+                std::stringstream ss;
+                ss << self;
+                return ss.str();
             })
         .def(
             "__repr__",
             [](const Interval& self) {
-                return (std::stringstream()
-                        << "Interval(" << self.INF << ", " << self.SUP << ")")
-                    .str();
+                std::stringstream ss;
+                ss << "Interval(" << self.INF << ", " << self.SUP << ")";
+                return ss.str();
             })
         .DEF_BIN_OP("add", a + b)
         .DEF_UN_OP("pos", +i)