diff --git a/pyproject.toml b/pyproject.toml
index 9dc4033f..5f1c818c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,4 +3,4 @@
 # Minimum requirements for the build system to execute.
 requires = ['setuptools>=45.0,<72.0', 'wheel', 'cython>=3.0.0', 'numpy>=1.25,<2.0.0',
             # Build against an old version (3.1.5) of mpi4py for forward compatibility
-            'mpi4py==3.1.5']
\ No newline at end of file
+            'mpi4py==3.1.6']
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 572e0922..f5746345 100644
--- a/setup.py
+++ b/setup.py
@@ -128,7 +128,7 @@ def get_mpi_flags():
     python_requires=">=3.9.0",
     install_requires=[
         "numpy<2.0.0",
-        "mpi4py>=3.1.5,<4.0.0",
+        "mpi4py>=3.1.6,<4.0.0",
         "scipy>=1.2.1",
         "pynastran>=1.4.0",
         "numba",