diff --git a/espresso-unittest.patch b/espresso-unittest.patch
new file mode 100644
index 0000000..77a8470
--- /dev/null
+++ b/espresso-unittest.patch
@@ -0,0 +1,63 @@
+diff --git a/testsuite/python/CMakeLists.txt b/testsuite/python/CMakeLists.txt
+index 85fb180db..c6a87aba0 100644
+--- a/testsuite/python/CMakeLists.txt
++++ b/testsuite/python/CMakeLists.txt
+@@ -55,6 +55,7 @@ function(PYTHON_TEST)
+     add_test(${TEST_NAME} ${CMAKE_BINARY_DIR}/pypresso ${PYPRESSO_OPTIONS}
+              ${TEST_FILE_CONFIGURED} ${TEST_ARGUMENTS})
+   endif()
++  set_tests_properties(${TEST_NAME} PROPERTIES SKIP_RETURN_CODE 5)
+   set_tests_properties(${TEST_NAME} PROPERTIES PROCESSORS ${TEST_NUM_PROC}
+                                                DEPENDS "${TEST_DEPENDS}")
+ 
+diff --git a/testsuite/scripts/CMakeLists.txt b/testsuite/scripts/CMakeLists.txt
+index a00b6de19..f243638a2 100644
+--- a/testsuite/scripts/CMakeLists.txt
++++ b/testsuite/scripts/CMakeLists.txt
+@@ -39,6 +39,7 @@ macro(PYTHON_SCRIPTS_TEST)
+   string(REGEX REPLACE "^test_" "${TEST_TYPE}_" TEST_NAME ${TEST_NAME})
+   add_test(${TEST_NAME} ${CMAKE_BINARY_DIR}/pypresso ${PYPRESSO_OPTIONS}
+            ${TEST_FILE_CONFIGURED})
++  set_tests_properties(${TEST_NAME} PROPERTIES SKIP_RETURN_CODE 5)
+   set_tests_properties(${TEST_NAME} PROPERTIES FIXTURES_REQUIRED
+                                                IMPORTLIB_WRAPPER)
+   set_tests_properties(${TEST_NAME} PROPERTIES LABELS "${TEST_LABELS}")
+diff --git a/testsuite/scripts/benchmarks/CMakeLists.txt b/testsuite/scripts/benchmarks/CMakeLists.txt
+index c5880959c..9689b26ba 100644
+--- a/testsuite/scripts/benchmarks/CMakeLists.txt
++++ b/testsuite/scripts/benchmarks/CMakeLists.txt
+@@ -25,6 +25,7 @@ endfunction(BENCHMARK_TEST)
+ # configure Python module importlib_wrapper.py
+ add_test(importlib_wrapper ${CMAKE_BINARY_DIR}/pypresso ${PYPRESSO_OPTIONS}
+          ${TEST_FILE_CONFIGURED_IMPORTLIB_WRAPPER})
++set_tests_properties(importlib_wrapper PROPERTIES SKIP_RETURN_CODE 5)
+ set_tests_properties(importlib_wrapper PROPERTIES FIXTURES_SETUP
+                                                   IMPORTLIB_WRAPPER)
+ set(benchmarks_tests ${benchmarks_tests}
+diff --git a/testsuite/scripts/samples/CMakeLists.txt b/testsuite/scripts/samples/CMakeLists.txt
+index d728c6b3a..e0dfb1b85 100644
+--- a/testsuite/scripts/samples/CMakeLists.txt
++++ b/testsuite/scripts/samples/CMakeLists.txt
+@@ -25,6 +25,7 @@ endfunction(SAMPLE_TEST)
+ # configure Python module importlib_wrapper.py
+ add_test(importlib_wrapper ${CMAKE_BINARY_DIR}/pypresso ${PYPRESSO_OPTIONS}
+          ${TEST_FILE_CONFIGURED_IMPORTLIB_WRAPPER})
++set_tests_properties(importlib_wrapper PROPERTIES SKIP_RETURN_CODE 5)
+ set_tests_properties(importlib_wrapper PROPERTIES FIXTURES_SETUP
+                                                   IMPORTLIB_WRAPPER)
+ set(samples_tests ${samples_tests} ${TEST_FILE_CONFIGURED_IMPORTLIB_WRAPPER}
+diff --git a/testsuite/scripts/tutorials/CMakeLists.txt b/testsuite/scripts/tutorials/CMakeLists.txt
+index 6ea9dfb57..c67492954 100644
+--- a/testsuite/scripts/tutorials/CMakeLists.txt
++++ b/testsuite/scripts/tutorials/CMakeLists.txt
+@@ -28,8 +28,10 @@ add_test(importlib_wrapper ${CMAKE_BINARY_DIR}/pypresso ${PYPRESSO_OPTIONS}
+          ${TEST_FILE_CONFIGURED_IMPORTLIB_WRAPPER})
+ add_test(convert ${CMAKE_BINARY_DIR}/pypresso ${PYPRESSO_OPTIONS}
+          ${CMAKE_CURRENT_BINARY_DIR}/test_convert.py)
++set_tests_properties(importlib_wrapper PROPERTIES SKIP_RETURN_CODE 5)
+ set_tests_properties(importlib_wrapper PROPERTIES FIXTURES_SETUP
+                                                   IMPORTLIB_WRAPPER)
++set_tests_properties(convert PROPERTIES SKIP_RETURN_CODE 5)
+ set_tests_properties(convert PROPERTIES FIXTURES_SETUP IMPORTLIB_WRAPPER)
+ set(tutorials_tests ${tutorials_tests} ${TEST_FILE_CONFIGURED_IMPORTLIB_WRAPPER}
+     PARENT_SCOPE)
diff --git a/espresso.spec b/espresso.spec
index cf4c5df..d9c9d8e 100644
--- a/espresso.spec
+++ b/espresso.spec
@@ -3,7 +3,7 @@
 
 Name:           espresso
 Version:        4.2.1
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        Extensible Simulation Package for Research on Soft matter
 # segfault on s390x: https://github.com/espressomd/espresso/issues/3753
 # segfault on armv7hl: https://src.fedoraproject.org/rpms/espresso/pull-request/4
@@ -21,6 +21,9 @@ Patch1:         %{name}-tracers.patch
 # fix for GCC compiler warning -Warray-bounds
 # https://github.com/espressomd/espresso/pull/4715
 Patch2:         %{name}-array-bounds.patch
+# fix API change in unittest from Python 3.12
+# https://github.com/espressomd/espresso/pull/4852
+Patch3:         %{name}-unittest.patch
 
 BuildRequires:  gcc-c++
 BuildRequires:  cmake3 >= 3.16
@@ -114,6 +117,7 @@ This package contains %{name} compiled against MPICH2.
 %patch 0 -p1
 %patch 1 -p1
 %patch 2 -p1
+%patch 3 -p1
 
 %build
 %global defopts \\\
@@ -171,6 +175,9 @@ done
 %{python3_sitearch}/mpich/%{name}md/
 
 %changelog
+* Mon Jan 22 2024 Jean-Noël Grad <jgrad@icp.uni-stuttgart.de> - 4.2.1-8
+- Fix for API change in unittest from Python 3.12
+
 * Fri Jan 19 2024 Fedora Release Engineering <releng@fedoraproject.org> - 4.2.1-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild