diff --git a/root-Python-Fix-TF1-Pythonization-test-for-NumPy-2.4.0.patch b/root-Python-Fix-TF1-Pythonization-test-for-NumPy-2.4.0.patch
new file mode 100644
index 0000000..2bc2576
--- /dev/null
+++ b/root-Python-Fix-TF1-Pythonization-test-for-NumPy-2.4.0.patch
@@ -0,0 +1,82 @@
+From d5135f7869406396b3ba8e944c71dbdd67d3ea01 Mon Sep 17 00:00:00 2001
+From: Jonas Rembser <jonas.rembser@cern.ch>
+Date: Tue, 23 Dec 2025 19:04:45 +0100
+Subject: [PATCH] [Python] Fix TF1 Pythonization test for NumPy 2.4.0
+
+The new NumPy 2.4.0 is more strict when implicitly converting 1-element
+arrays to scalars. It doesn't do that anymore, causing the TF1
+Pythonization tests to fail (see log below).
+
+This actually pointed to a real mistake in setting up the test, where a
+2D array was used to define the TFormula parameters while it should be a
+1D array.
+
+```txt
+ 962/3718 Test   #93: pyunittests-bindings-pyroot-pythonizations-pyroot-pyz-tf-pycallables ..............................***Failed    3.05 sec
+test_callable (tf_pycallables.TF1.test_callable)
+Test function provided as callable ... ok
+test_evalpar (tf_pycallables.TF1.test_evalpar)
+Test the 2D Numpy array pythonizations for TF1::EvalPar ... ERROR
+test_evalpar_dynamic (tf_pycallables.TF1.test_evalpar_dynamic)
+Test the 2D NumPy pythonizations with dynamic TF1 data dimensions ... ok
+test_fitgauss (tf_pycallables.TF1.test_fitgauss)
+Test fitting a histogram to a Python function ... ok
+test_identity (tf_pycallables.TF1.test_identity)
+Test simple function without parameters ... ok
+test_params (tf_pycallables.TF1.test_params)
+Test function with parameters ... ok
+test_params (tf_pycallables.TF2.test_params)
+Test function with parameters ... ok
+test_params (tf_pycallables.TF3.test_params)
+Test function with parameters ... ok
+
+======================================================================
+ERROR: test_evalpar (tf_pycallables.TF1.test_evalpar)
+Test the 2D Numpy array pythonizations for TF1::EvalPar
+----------------------------------------------------------------------
+Traceback (most recent call last):
+  File "/github/home/ROOT-CI/src/bindings/pyroot/pythonizations/test/tf_pycallables.py", line 129, in test_evalpar
+    expected_value = pyf_tf1_coulomb(x[i, ::2], params)
+  File "/github/home/ROOT-CI/src/bindings/pyroot/pythonizations/test/tf_pycallables.py", line 33, in pyf_tf1_coulomb
+    return p[1] * x[0] * x[1] / (p[0]**2) * math.exp(-p[2] / p[0])
+                                            ~~~~~~~~^^^^^^^^^^^^^^
+TypeError: only 0-dimensional arrays can be converted to Python scalars
+
+----------------------------------------------------------------------
+Ran 8 tests in 1.469s
+
+FAILED (errors=1)
+CMake Error at /github/home/ROOT-CI/src/cmake/modules/RootTestDriver.cmake:232 (message):
+  error code: 1
+
+```
+---
+ .../pyroot/pythonizations/test/tf_pycallables.py     | 12 +++++++-----
+ 1 file changed, 7 insertions(+), 5 deletions(-)
+
+diff --git a/bindings/pyroot/pythonizations/test/tf_pycallables.py b/bindings/pyroot/pythonizations/test/tf_pycallables.py
+index 2a7d6b72462..5a223030ec9 100644
+--- a/bindings/pyroot/pythonizations/test/tf_pycallables.py
++++ b/bindings/pyroot/pythonizations/test/tf_pycallables.py
+@@ -116,11 +116,13 @@ class TF1(unittest.TestCase):
+             [3.0, 10, 4.0]
+         ])
+ 
+-        params = np.array([
+-            [1.0],       # Distance between charges r
+-            [8.99e9],    # Coulomb constant k (in N·m²/C²)
+-            [0.1]        # Additional factor for modulation
+-        ])
++        params = np.array(
++            [
++                1.0,  # Distance between charges r
++                8.99e9,  # Coulomb constant k (in N·m²/C²)
++                0.1,  # Additional factor for modulation
++            ]
++        )
+ 
+         # Slice to avoid the dummy column of 10's
+         res = rtf1_coulomb.EvalPar(x[:, ::2], params)
+-- 
+2.52.0
+
diff --git a/root.spec b/root.spec
index 5271fad..def5fea 100644
--- a/root.spec
+++ b/root.spec
@@ -39,7 +39,7 @@
 Name:		root
 Version:	6.38.00
 %global libversion %(cut -d. -f 1-2 <<< %{version})
-Release:	4%{?dist}
+Release:	5%{?dist}
 Summary:	Numerical data analysis framework
 
 License:	LGPL-2.1-or-later
@@ -100,6 +100,9 @@ Patch13:	%{name}-cppyy-Remove-code-related-to-finding-CPyCppyy-API-he.patch
 #		Don't install the python modules twice
 #		https://github.com/root-project/root/pull/20753
 Patch14:	%{name}-PyROOT-Don-t-install-the-python-modules-twice.patch
+#		Fix test for stricter syntax in numpy 2.4.0 (backport)
+#		https://github.com/root-project/root/pull/20775
+Patch15:	%{name}-Python-Fix-TF1-Pythonization-test-for-NumPy-2.4.0.patch
 
 BuildRequires:	gcc-c++
 BuildRequires:	gcc-gfortran
@@ -1905,6 +1908,7 @@ This package contains a library for histogramming in ROOT 7.
 %patch -P12 -p1
 %patch -P13 -p1
 %patch -P14 -p1
+%patch -P15 -p1
 
 # Remove bundled sources in order to be sure they are not used
 #  * afterimage
@@ -3456,6 +3460,9 @@ fi
 %endif
 
 %changelog
+* Thu Dec 25 2025 Mattias Ellert <mattias.ellert@physics.uu.se> - 6.38.00-5
+- Fix test for stricter syntax in numpy 2.4.0 (backport)
+
 * Fri Dec 19 2025 Mattias Ellert <mattias.ellert@physics.uu.se> - 6.38.00-4
 - Exclude tests for Fedora 43+ on s390x that fail due to hardware
   acceleration in the zlib-ng library.