diff --git a/dependencies.json b/dependencies.json
index ec56f502..6b79735c 100644
--- a/dependencies.json
+++ b/dependencies.json
@@ -2,6 +2,6 @@
     "version_pyamrex": "25.10",
     "version_amrex": "25.10",
     "version_pybind11": "v3.0.1",
-    "commit_amrex": "25.10",
+    "commit_amrex": "26054b26bb653e594835a5a686893f6c20e7c5cd",
     "commit_pybind11": "v3.0.1"
 }
diff --git a/src/Base/FabArray.cpp b/src/Base/FabArray.cpp
index d453f097..a267c70c 100644
--- a/src/Base/FabArray.cpp
+++ b/src/Base/FabArray.cpp
@@ -165,20 +165,22 @@ namespace
                  "Returns the sum of component \"comp\""
             )
             .def("sum_boundary",
-                 py::overload_cast< Periodicity const & >(&FAT::SumBoundary),
-                 py::arg("period"),
+                 py::overload_cast< Periodicity const &, bool >(&FAT::SumBoundary),
+                 py::arg("period"), py::arg("deterministic") = false,
                  "Sum values in overlapped cells.  The destination is limited to valid cells."
             )
-            .def("sum_boundary", py::overload_cast< int, int, Periodicity const & >(&FAT::SumBoundary),
-                 py::arg("scomp"), py::arg("ncomp"), py::arg("period"),
+            .def("sum_boundary", py::overload_cast< int, int, Periodicity const &, bool >(&FAT::SumBoundary),
+                 py::arg("scomp"), py::arg("ncomp"), py::arg("period"), py::arg("deterministic") = false,
                  "Sum values in overlapped cells.  The destination is limited to valid cells."
             )
-            .def("sum_boundary", py::overload_cast< int, int, IntVect const&, Periodicity const & >(&FAT::SumBoundary),
+            .def("sum_boundary", py::overload_cast< int, int, IntVect const&, Periodicity const &, bool >(&FAT::SumBoundary),
                  py::arg("scomp"), py::arg("ncomp"), py::arg("nghost"), py::arg("period"),
+                 py::arg("deterministic") = false,
                  "Sum values in overlapped cells.  The destination is limited to valid cells."
             )
-            .def("sum_boundary", py::overload_cast< int, int, IntVect const&, IntVect const&, Periodicity const & >(&FAT::SumBoundary),
+            .def("sum_boundary", py::overload_cast< int, int, IntVect const&, IntVect const&, Periodicity const &, bool >(&FAT::SumBoundary),
                  py::arg("scomp"), py::arg("ncomp"), py::arg("nghost"), py::arg("dst_nghost"), py::arg("period"),
+                 py::arg("deterministic") = false,
                  "Sum values in overlapped cells.  The destination is limited to valid cells."
             )
         ;