diff --git a/Testing/CMakeLists.txt b/Testing/CMakeLists.txt
index 51fce96..0633ad2 100644
--- a/Testing/CMakeLists.txt
+++ b/Testing/CMakeLists.txt
@@ -1,5 +1,5 @@
 #  The python interpreter may not be in the same location on all systems.
-find_package (PythonInterp)
+find_package (Python3 COMPONENTS Interpreter REQUIRED)
 
 set (TEST_SCRIPT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/test_utilities)
 
diff --git a/Testing/tests/niter_test/CMakeLists.txt b/Testing/tests/niter_test/CMakeLists.txt
index 4db9e10..c280a78 100644
--- a/Testing/tests/niter_test/CMakeLists.txt
+++ b/Testing/tests/niter_test/CMakeLists.txt
@@ -18,7 +18,7 @@ set_tests_properties (niter_test
                       PROCESSORS $<TARGET_PROPERTY:stell,MPIEXEC_MAX_NUMPROCS>)
 
 add_test (NAME niter_check_wout_test
-          COMMAND ${PYTHON_EXECUTABLE} ${TEST_SCRIPT_DIR}/check_file.py --file=${CMAKE_CURRENT_BINARY_DIR}/wout_test.vmec.nc)
+          COMMAND ${Python3_EXECUTABLE} ${TEST_SCRIPT_DIR}/check_file.py --file=${CMAKE_CURRENT_BINARY_DIR}/wout_test.vmec.nc)
 set_tests_properties (niter_check_wout_test
                       PROPERTIES
                       DEPENDS niter_test)