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diff --git a/CI/physmon/reference/trackrefitting_gsf/performance_trackrefitting.root b/CI/physmon/reference/trackrefitting_gsf/performance_trackrefitting.root
index 3d261afc950..353e07326ab 100644
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diff --git a/CI/physmon/reference/trackrefitting_kf/performance_trackrefitting.root b/CI/physmon/reference/trackrefitting_kf/performance_trackrefitting.root
index e199718329a..bc434b242a3 100644
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diff --git a/CI/physmon/workflows/physmon_trackrefitting_kf.py b/CI/physmon/workflows/physmon_trackrefitting_kf.py
index d31879ae66a..f05baf8100a 100755
--- a/CI/physmon/workflows/physmon_trackrefitting_kf.py
+++ b/CI/physmon/workflows/physmon_trackrefitting_kf.py
@@ -26,6 +26,7 @@
         outputDir=tp,
         reverseFilteringMomThreshold=float("inf"),
         reverseFilteringCovarianceScaling=100.0,
+        seed=1337,
         s=s,
     )
 
diff --git a/Examples/Framework/src/Framework/RandomNumbers.cpp b/Examples/Framework/src/Framework/RandomNumbers.cpp
index 4313a5cce77..94b37035fad 100644
--- a/Examples/Framework/src/Framework/RandomNumbers.cpp
+++ b/Examples/Framework/src/Framework/RandomNumbers.cpp
@@ -10,6 +10,8 @@
 
 #include "ActsExamples/Framework/AlgorithmContext.hpp"
 
+#include <boost/functional/hash.hpp>
+
 namespace ActsExamples {
 
 RandomNumbers::RandomNumbers(const Config& cfg) : m_cfg(cfg) {}
@@ -20,7 +22,9 @@ RandomEngine RandomNumbers::spawnGenerator(
 }
 
 RandomSeed RandomNumbers::generateSeed(const AlgorithmContext& context) const {
-  return m_cfg.seed + context.eventNumber;
+  std::size_t seed = m_cfg.seed;
+  boost::hash_combine(seed, context.eventNumber);
+  return seed;
 }
 
 }  // namespace ActsExamples
diff --git a/Examples/Python/tests/root_file_hashes.txt b/Examples/Python/tests/root_file_hashes.txt
index a8dd1ec74e9..a5ed3e67f21 100644
--- a/Examples/Python/tests/root_file_hashes.txt
+++ b/Examples/Python/tests/root_file_hashes.txt
@@ -1,54 +1,54 @@
-test_pythia8__particles.root: 82a4b1378dd5927e1f7841f67d49c34f6f69fb4a65a20aad01323e806d602261
-test_fatras__particles_simulation.root: 58706945a7537d4bbbaee6128019af50f6318c97355acb5a31f10f056d0849c4
-test_fatras__hits.root: f90e8b2d52925b27a6184031503e874c33586aa9a504d2ac9084d549f7f95114
-test_geant4__particles_simulation.root: 62768c51928f01f49e5f00614294d4822d986df37687b8f6ce5afb5088531979
-test_geant4__hits.root: 1587a3d2f025f49da043f5e1b21280bb5a3f3df3c02863b8ad12f512b5bdb016
-test_seeding__estimatedparams.root: 5d74560f95e924685436d511ded1c436dd41935dbe02f02e501c95ee12677251
+test_pythia8__particles.root: 291ed316ea673ce8b8dcc54bf5fa0b993ca987c48c678ac9113d505b6de68d1f
+test_fatras__particles_simulation.root: de02f4281dec0145d2861e06c9ed0e868bdfbfe539e3cad33944fd664acaeeb3
+test_fatras__hits.root: bf6038b5abba34d86c0b2d3a4c6031aaf309d19b64b2e148153d39c00982cabd
+test_geant4__particles_simulation.root: a1b88fe1660ef2e956e56a00792ab8b16855cd88b2005fd40ceba271109dc357
+test_geant4__hits.root: 5e57c8dbe3cdf8165d701f4d629348cff6738d2736eb8a3cd0b86fefb44bc7d3
+test_seeding__estimatedparams.root: dc311a4d737d88ce381b85a4479c9747510691abe79174de58e334de9494d92c
 test_seeding__performance_seeding.root: 992f9c611d30dde0d3f3ab676bab19ada61ab6a4442828e27b65ec5e5b7a2880
-test_seeding__particles.root: b74282c72164494b51e918dd355b382feb975c9139b93b0f7d858e9d4c77c9d0
-test_seeding__particles_simulation.root: 17ce662aedf8ea0596838a206c696d844b78d6f25a9bb1e29c7f388654f814c9
+test_seeding__particles.root: a0744d4373572ff91bf85d2f52ca18421c092325bb3ec1cf06f17211da5c649b
+test_seeding__particles_simulation.root: 7fed798e6219f6c33698885ce5b5cb736b5f760f393d03378efb89666f018611
 test_hashing_seeding__estimatedparams.root: 0b49f0d880121ded80ec3221153543b64a60d8226abb8ad738edda38a36aa311
-test_seeding_orthogonal__estimatedparams.root: 89f32f499f4a39b6a7493b8a413688e8e4cef61bf334564afc30a35067dbf921
+test_seeding_orthogonal__estimatedparams.root: dc311a4d737d88ce381b85a4479c9747510691abe79174de58e334de9494d92c
 test_seeding_orthogonal__performance_seeding.root: 60fbedcf5cb2b37cd8e526251940564432890d3a159d231ed819e915a904682c
-test_seeding_orthogonal__particles.root: b74282c72164494b51e918dd355b382feb975c9139b93b0f7d858e9d4c77c9d0
-test_seeding_orthogonal__particles_simulation.root: 17ce662aedf8ea0596838a206c696d844b78d6f25a9bb1e29c7f388654f814c9
-test_itk_seeding__estimatedparams.root: d9e435a901548634d9848efc49f5e2cc7f901c18e25dcb89859cf12ec57f2782
+test_seeding_orthogonal__particles.root: a0744d4373572ff91bf85d2f52ca18421c092325bb3ec1cf06f17211da5c649b
+test_seeding_orthogonal__particles_simulation.root: 7fed798e6219f6c33698885ce5b5cb736b5f760f393d03378efb89666f018611
+test_itk_seeding__estimatedparams.root: b28b7f4bbf4627728cb64950aa68d612517bc23d052c109febf80d8d4a9508af
 test_itk_seeding__performance_seeding.root: 78ebda54cd0f026ba4b7f316724ffd946de56a932735914baf1b7bba9505c29d
-test_itk_seeding__particles.root: af384190a2fd846c569e65f050507c9827be6ade0168013f243c79e74c3280f6
-test_itk_seeding__particles_simulation.root: b73d72fb9b02ec59a4bf6ddee8199f2bda4f871dc91057a0020ea73053395498
-test_propagation__propagation_summary.root: 4b6ac4c6ec43831bf9c51a6f617752d2d92d4fded3d4fecfa7ad238d32288c41
-test_material_recording__geant4_material_tracks.root: c022b9362249b29f57a07926b20644e3ab4ab8ebcf03f773fbf46c446fc1a0a1
-test_truth_tracking_gsf[generic]__trackstates_gsf.root: 8636de2d84f8c1a7141f010a6c7da173fad7a9413c4761e474a3ef7f64536fa3
-test_truth_tracking_gsf[generic]__tracksummary_gsf.root: 347fbd3f8f8c225a39a2854b63e4adda04860b3329f44c6f9c950aeede75cf52
-test_truth_tracking_gsf[odd]__trackstates_gsf.root: dceae5a5da85cea94bf6fa373b1094b1019e4194a5b44e944bf9e7ef84ea1c5b
-test_truth_tracking_gsf[odd]__tracksummary_gsf.root: 0233b978c22e4bc81bb02c487687d17708c75d98e46aa83f47aec75a403100fd
-test_particle_gun__particles.root: 7097aadf52e7c869e169c01820bf57b0f0f892cc41a955ce4bdcb858b2a1d725
-test_material_mapping__material-map_tracks.root: f8c4cc24dbe66de4e03cdc16f08491b7622ca07df2fab4088214969c56b043b6
-test_material_mapping__propagation-material.root: 0635939f20aa3a911dcd53725d86599d9cbdfe0f3bf6ab4699e317f947281488
-test_volume_material_mapping__material-map-volume_tracks.root: 2daa3aa2ad39fe908231511495c87d3a591169ed62ea14dd598d9381c5da5b19
-test_volume_material_mapping__propagation-volume-material.root: 2fa97d7e17621bf7a6ce3addc4b303559e9e337125744fde8967a9e5428bfe9c
-test_digitization_example[smeared]__measurements.root: 3b9dd31ad59d8389a49cbec0e416e0355f07c5087cd3dafd582021f9f646c437
-test_digitization_example[geometric]__measurements.root: 600adffa1ae0f83618629e81d3dcbdb3831730bc76be0b20d9eda8f14a5bfb47
-test_digitization_example_input[smeared]__particles.root: 7097aadf52e7c869e169c01820bf57b0f0f892cc41a955ce4bdcb858b2a1d725
-test_digitization_example_input[smeared]__measurements.root: a89890b3cbbd23b08b69afcc84c7f3b7747b32e7f347482d9726a538a2e5aba7
-test_digitization_example_input[geometric]__particles.root: 7097aadf52e7c869e169c01820bf57b0f0f892cc41a955ce4bdcb858b2a1d725
-test_digitization_example_input[geometric]__measurements.root: a6b751837e68adec0cb89f7a97152e61cda5deea43e9c1682d8fbcb1897d982e
-test_ckf_tracks_example[generic-full_seeding]__trackstates_ckf.root: 8f0e0f789718f944705c07a231bd445d336103edf9b3833ab661c418cfdf3b2a
-test_ckf_tracks_example[generic-full_seeding]__tracksummary_ckf.root: 9882a298ef06cecb52941276c9c9f86de54f59cfddf53483534573d3e4203245
+test_itk_seeding__particles.root: 0a2a55d7e6b0a34216dc56ccc949d129d2fe26985e8cea04652ecdb9f4752ffd
+test_itk_seeding__particles_simulation.root: 2efdfa518f0ff17f0354c52ba40a9785dcaea275a947032d83eeceb8c57dd098
+test_propagation__propagation_summary.root: 2dbe7bdac1a9a5df24831db029befd20793ce8fc879fb6d42524a21ba77146fb
+test_material_recording__geant4_material_tracks.root: bbee7c5060c61715cd3d1db7d43933091686d8d6268ba573723b820bbf3439d8
+test_truth_tracking_gsf[generic]__trackstates_gsf.root: fa9d49f6e0e364fa9dee763564d33cde8f1b67c5342895a6754473b92fb01345
+test_truth_tracking_gsf[generic]__tracksummary_gsf.root: 3a4d5751be6f079d68a9adc4a7f85ef1b6d043df9bf2b8e3e4540ca03779feb3
+test_truth_tracking_gsf[odd]__trackstates_gsf.root: 901ace60a918ceda4f8eabd48b4a63d082b151fc70aeb448bdd92a43208d0910
+test_truth_tracking_gsf[odd]__tracksummary_gsf.root: 2c1e492cc7eb252760ca901cdf5afa716a5f6bc1ea1e1c453af5784e9dae51e1
+test_particle_gun__particles.root: 967b17b2b2c92126d82b847f65176b35024cbf12c1d6c1523abb8c1b6bc9dae4
+test_material_mapping__material-map_tracks.root: a01c5b2742ed0ff2d5ceeae8e2a06dd6f7748832538c475a3b2fdb725a39da73
+test_material_mapping__propagation-material.root: 8e8eb393b0a5d8a7fd9c1c6933cbe3a196b4e448a98f52740e34c50b95cc156a
+test_volume_material_mapping__material-map-volume_tracks.root: 1628e6232ce075d0716fda1bc07259dc676b898ad624568c6e1822ca45694b28
+test_volume_material_mapping__propagation-volume-material.root: 5f8230f5850f41495ff9f82e59cae1d322fe389503b6864194666c2fe2f5ae18
+test_digitization_example[smeared]__measurements.root: ba2f6ac64ca369895051bd689d533789eb68ef7d8ab827806a72be616e49997c
+test_digitization_example[geometric]__measurements.root: 3f7a709374fe526bfe90445d309a3a3de846d75f6bd6e21a62074dafa39fb38f
+test_digitization_example_input[smeared]__particles.root: 967b17b2b2c92126d82b847f65176b35024cbf12c1d6c1523abb8c1b6bc9dae4
+test_digitization_example_input[smeared]__measurements.root: 41fed17fd2b9bee030ef3dadd7b202c0bc7e38e504ded0e2d86d216f342b319e
+test_digitization_example_input[geometric]__particles.root: 967b17b2b2c92126d82b847f65176b35024cbf12c1d6c1523abb8c1b6bc9dae4
+test_digitization_example_input[geometric]__measurements.root: 82db31674a53e60e06e5bec4e93edbca56badde8d2c9e649c86e014bd356acef
+test_ckf_tracks_example[generic-full_seeding]__trackstates_ckf.root: 7ecf137e80e36f5ab6b314fed678d5b452976b25079457c16c668b53fc022081
+test_ckf_tracks_example[generic-full_seeding]__tracksummary_ckf.root: e3de50dc5ca5606c1d80a3e930ad0df9b418379de74ef9688889d71761f9364b
 test_ckf_tracks_example[generic-full_seeding]__performance_seeding_trees.root: 0e0676ffafdb27112fbda50d1cf627859fa745760f98073261dcf6db3f2f991e
-test_ckf_tracks_example[generic-truth_estimated]__trackstates_ckf.root: 17cfdb7b275620bec85ae7af99d7802ef01f06261d602c9d770ace33c8f3d532
-test_ckf_tracks_example[generic-truth_estimated]__tracksummary_ckf.root: f946368c7dbbedafcbbb7272f3690e115fafca9ec17a41270121d200b5ccce8d
+test_ckf_tracks_example[generic-truth_estimated]__trackstates_ckf.root: 76ecee4a9c605025042b58b289f7f518600eb4d07bd6be9755ee2e3624c5067f
+test_ckf_tracks_example[generic-truth_estimated]__tracksummary_ckf.root: 47da0c2c7077e19c888c48c572b576e1f9ca9d97f979a8614a78aec5d7e15d71
 test_ckf_tracks_example[generic-truth_estimated]__performance_seeding.root: 1facb05c066221f6361b61f015cdf0918e94d9f3fce2269ec7b6a4dffeb2bc7e
-test_ckf_tracks_example[generic-truth_smeared]__trackstates_ckf.root: d797c2d63ceda7e62faa8e6c229e454ba2c31cb3f076f2ea0665ade3835d81e6
-test_ckf_tracks_example[generic-truth_smeared]__tracksummary_ckf.root: 0750038736bc3baf4056cce29274fac0692876d9fa7be032ea8156bfe10d428a
-test_ckf_tracks_example[odd-full_seeding]__trackstates_ckf.root: baf63198f5e99e8205f177f38de6f5ead350c99f18bf4b52163d2a3755f88349
-test_ckf_tracks_example[odd-full_seeding]__tracksummary_ckf.root: 8bd63ba7571487545b9614d4b5acb58b13e22725a31f6b326a560ea0173948fc
+test_ckf_tracks_example[generic-truth_smeared]__trackstates_ckf.root: c32c51cb018632b23e8bfb202d1bc0c0e3e982cf7e721e686aa57ae2c8eb5485
+test_ckf_tracks_example[generic-truth_smeared]__tracksummary_ckf.root: 1a2c11d99e848003bb3edbf7682f8d11e610a4372fa46bb7c08171cc80f5131e
+test_ckf_tracks_example[odd-full_seeding]__trackstates_ckf.root: 0c623deba8320d1b43417fe4a3a07f5ae924f93f74556b4ce4d1af6d98bf81eb
+test_ckf_tracks_example[odd-full_seeding]__tracksummary_ckf.root: aba2eae1a1ccc4133249b190b4d9aa5d4ebef538ff03ca31506745b3c24b118a
 test_ckf_tracks_example[odd-full_seeding]__performance_seeding_trees.root: 43c58577aafe07645e5660c4f43904efadf91d8cda45c5c04c248bbe0f59814f
-test_ckf_tracks_example[odd-truth_estimated]__trackstates_ckf.root: 56427c27e7cd7de399b8d660bfa844f4cfae568c2da159b060894030a5b7462b
-test_ckf_tracks_example[odd-truth_estimated]__tracksummary_ckf.root: 07fc3d4d36b19f74c38f08f4b1cf70cd7882384d8c6d53b9636956908dcd0c05
+test_ckf_tracks_example[odd-truth_estimated]__trackstates_ckf.root: 880c671af23ebf2645fafdeb9c44ea3d771ff5ab4c73c1f240de6daec3c0fe4c
+test_ckf_tracks_example[odd-truth_estimated]__tracksummary_ckf.root: 7e19ea0412e886db4f3deef66f1d763cfaabcfea7394a28fdfc79fa111c3febc
 test_ckf_tracks_example[odd-truth_estimated]__performance_seeding.root: 1a36b7017e59f1c08602ef3c2cb0483c51df248f112e3780c66594110719c575
-test_ckf_tracks_example[odd-truth_smeared]__trackstates_ckf.root: 7dd4cb632e538c98308f286fb8dabc079001fa73a01fccccf72ab2255a368ee7
-test_ckf_tracks_example[odd-truth_smeared]__tracksummary_ckf.root: 7608b393fc68cfdcfc2b2c26fdebd2a433f6ccbafcd0b6ab015c683e923389af
+test_ckf_tracks_example[odd-truth_smeared]__trackstates_ckf.root: b86acd5f2b4caa0d22ad946f635c81bc419bf3c1948718f10f687a6cbb1696d5
+test_ckf_tracks_example[odd-truth_smeared]__tracksummary_ckf.root: 9291fa73efbf66a239d59ecbb256c705434b39b070e8f457d3602d386b128ace
 test_vertex_fitting_reading[Truth-False-100]__performance_vertexing.root: 76ef6084d758dfdfc0151ddec2170e12d73394424e3dac4ffe46f0f339ec8293
 test_vertex_fitting_reading[Iterative-False-100]__performance_vertexing.root: 60372210c830a04f95ceb78c6c68a9b0de217746ff59e8e73053750c837b57eb
 test_vertex_fitting_reading[Iterative-True-100]__performance_vertexing.root: e34f217d524a5051dbb04a811d3407df3ebe2cc4bb7f54f6bda0847dbd7b52c3
@@ -56,34 +56,34 @@ test_vertex_fitting_reading[AMVF-False-100]__performance_vertexing.root: 009e4b1
 test_vertex_fitting_reading[AMVF-True-100]__performance_vertexing.root: 2d0dc1e02bfd1f7eaae26ef8ac657ce0291f70c7e4efddd35d171d31988a631e
 test_bfield_writing__solenoid.root: 7be51f0ed9cb99f59ae0271ba79cdb84635e6ee3d2109ea8a4b521875029c21d
 test_bfield_writing__solenoid2.root: 2db149336c9cd749dc50025076b49f9bc0586d53792b87a0fdd7f21a649a01a5
-test_root_prop_step_writer[configPosConstructor]__prop_steps.root: e277038bbd92c628294cdac914a5af4508602895020b743893d649916f9236a8
-test_root_prop_step_writer[configKwConstructor]__prop_steps.root: e277038bbd92c628294cdac914a5af4508602895020b743893d649916f9236a8
-test_root_prop_step_writer[kwargsConstructor]__prop_steps.root: e277038bbd92c628294cdac914a5af4508602895020b743893d649916f9236a8
-test_root_particle_writer[configPosConstructor]__particles.root: e0fb89de2b2d68d38df5f63544929ec64d1f067289d62aeb3008d52ca98cb9bd
-test_root_particle_writer[configKwConstructor]__particles.root: e0fb89de2b2d68d38df5f63544929ec64d1f067289d62aeb3008d52ca98cb9bd
-test_root_particle_writer[kwargsConstructor]__particles.root: e0fb89de2b2d68d38df5f63544929ec64d1f067289d62aeb3008d52ca98cb9bd
-test_root_meas_writer__meas.root: 59141f0eeeb093e6233b6b6f2413c5d3957994c0574204a4c53827adc945a3e1
-test_root_simhits_writer[configPosConstructor]__meas.root: 350be5ab060f904d3a9536cf0789bc5786f3205c107a19a5620f8cd0681679e5
-test_root_simhits_writer[configKwConstructor]__meas.root: 350be5ab060f904d3a9536cf0789bc5786f3205c107a19a5620f8cd0681679e5
-test_root_simhits_writer[kwargsConstructor]__meas.root: 350be5ab060f904d3a9536cf0789bc5786f3205c107a19a5620f8cd0681679e5
+test_root_prop_step_writer[configPosConstructor]__prop_steps.root: e68a1988e54b6417f8b62388e4e4e7bbb256e48f6a758685326dad512e739d35
+test_root_prop_step_writer[configKwConstructor]__prop_steps.root: e68a1988e54b6417f8b62388e4e4e7bbb256e48f6a758685326dad512e739d35
+test_root_prop_step_writer[kwargsConstructor]__prop_steps.root: e68a1988e54b6417f8b62388e4e4e7bbb256e48f6a758685326dad512e739d35
+test_root_particle_writer[configPosConstructor]__particles.root: 064537e541fc6384d4c5b070df80206a02f1dfb9411c3437738b9b0e9a580af8
+test_root_particle_writer[configKwConstructor]__particles.root: 064537e541fc6384d4c5b070df80206a02f1dfb9411c3437738b9b0e9a580af8
+test_root_particle_writer[kwargsConstructor]__particles.root: 064537e541fc6384d4c5b070df80206a02f1dfb9411c3437738b9b0e9a580af8
+test_root_meas_writer__meas.root: efb1326ed12c8447163bd6b4282489bdf87409a793692b054b608a38b3c18641
+test_root_simhits_writer[configPosConstructor]__meas.root: d174a82345fcb7060356e182f29504041f25e9bd746ef7c1a9e7a9c0d466760c
+test_root_simhits_writer[configKwConstructor]__meas.root: d174a82345fcb7060356e182f29504041f25e9bd746ef7c1a9e7a9c0d466760c
+test_root_simhits_writer[kwargsConstructor]__meas.root: d174a82345fcb7060356e182f29504041f25e9bd746ef7c1a9e7a9c0d466760c
 test_root_material_writer__material.root: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
 test_root_clusters_writer[configPosConstructor]__clusters.root: e842df4fe04eefff3df5f32cd1026e93286be62b8040dc700a2aff557c56dec8
 test_root_clusters_writer[configKwConstructor]__clusters.root: e842df4fe04eefff3df5f32cd1026e93286be62b8040dc700a2aff557c56dec8
 test_root_clusters_writer[kwargsConstructor]__clusters.root: e842df4fe04eefff3df5f32cd1026e93286be62b8040dc700a2aff557c56dec8
 test_gnn[cpu-torch]__performance_track_finding.root: 36b3045589c4c17c038dbc87943366f4af4440f7eea6887afb763871ac149b05
-test_gnn[gpu-onnx]__performance_track_finding.root: 1296cca662a15c06abfc20c37a4e734fddf6a1d42ec8dfcf48da3a719710ce20
+test_gnn[gpu-onnx]__performance_track_finding.root: 972311a50be99d774615e4fb058f15e6c9f16db1d16ef129d095d0a6d8cc984b
 test_gnn[gpu-torch]__performance_track_finding.root: acecf81b84b7b007070e5b38a93cc71b805d906606094e6dab08c88259526fd0
 test_ML_Ambiguity_Solver__performance_finding_ambiML.root: 65cb7a6fc35d5bc2d86636222271430aca41603b2fc3a7141af1ef77b3296015
-test_refitting[generic]__trackstates_gsf_refit.root: 296880fa89be5b67d62fe35feca66470f2f75395ad3a47553861d3831f1128f2
-test_refitting[generic]__tracksummary_gsf_refit.root: e2842f57c4f97012a6391f3de8d2a22f37112fa10a6e457f455c51f2e6079338
-test_refitting[odd]__trackstates_gsf_refit.root: 098b781c9d949c458803d92b3766c7cd322d1b470d4ebe98fc92948097f18723
-test_refitting[odd]__tracksummary_gsf_refit.root: 44bda72c649ae2ff3022c4672daf4e01105ea96a1049943661c09478bf6259ec
-test_truth_tracking_kalman[generic-0.0]__trackstates_kf.root: 82343fb371082831c96fc62bd875acdf40001efc7031eaf032f3cd0ad47695b8
-test_truth_tracking_kalman[generic-0.0]__tracksummary_kf.root: 0e83cf164429a593fc5a1b5e542a86019f95c67ed64e546829b2f0e6da787754
-test_truth_tracking_kalman[generic-1000.0]__trackstates_kf.root: 59a3d525d2b2bc107c05be2189df387b7fc89594613dbf3fef12b0ff5f48492c
-test_truth_tracking_kalman[generic-1000.0]__tracksummary_kf.root: 1f40e8dae0f9c8eb4861dfaf5b69f739ade60c6b6e2f8b3596181058860339fb
-test_truth_tracking_kalman[odd-0.0]__trackstates_kf.root: 0b6d1b3f0abe5b6353b918a19fb7cd3042f0293d181777067f992ab86dd603ab
-test_truth_tracking_kalman[odd-0.0]__tracksummary_kf.root: 3e3507885fbf73f6ae2bbaf2c7fa5803c45c6a7e839a3ba0ebbb784b31222cdb
-test_truth_tracking_kalman[odd-1000.0]__trackstates_kf.root: fc8c70cd653a64807fd54a7fd08160744a34f148a072322cf4de637c54821cdf
-test_truth_tracking_kalman[odd-1000.0]__tracksummary_kf.root: ddf07e2a12f93052e1ac835a51c8a717f5d73da76cac4e43a69813bcecfcccc6
-test_strip_spacepoints[odd]__strip_spacepoints.root: fa0b3db6dbcc876de29769cb2b45680fd181e51697de2b591baf8a0bfc577750
+test_refitting[generic]__trackstates_gsf_refit.root: 01abc6d1d77fc3a8c248f007a2ef53189dbb667f22107f0a67655dc11304ab5d
+test_refitting[generic]__tracksummary_gsf_refit.root: 8890152857d8802afd37fee2047a8556fa7b2b98b47ec00c55934fbac3d9db03
+test_refitting[odd]__trackstates_gsf_refit.root: 09473a24187b579b7c0efc4429f5340758aef2da817f8da9963596b25f19e7d9
+test_refitting[odd]__tracksummary_gsf_refit.root: e99d102aeb24b1862a602cd8d72e6090b9a21ea6f9aa946ae82efb5b97c28f1a
+test_truth_tracking_kalman[generic-0.0]__trackstates_kf.root: 5d951589622bb38807bb753eaf8c9ef7005eead8ffe6ac440d299241126ee8c0
+test_truth_tracking_kalman[generic-0.0]__tracksummary_kf.root: f6b98d02a82fa3ae543f953f40330eb21ce692550e155fec0037a10eaf8aa3ba
+test_truth_tracking_kalman[generic-1000.0]__trackstates_kf.root: 7f35d64b10153cb0a0d0545dfaac9abc15adb81c766b388b848202504137a79e
+test_truth_tracking_kalman[generic-1000.0]__tracksummary_kf.root: f49b720007224af72067a072fe5c9ecf73522e98bb0b68dfdda5315bf0a03d8d
+test_truth_tracking_kalman[odd-0.0]__trackstates_kf.root: 084c542e92b09d5d69104bbafe1d8c24d7a3bf4ef900551413a2e4696343f467
+test_truth_tracking_kalman[odd-0.0]__tracksummary_kf.root: 128fe1774d44a9cced8bfb36613119c2819a036dfd44c7324c59fe50f16a3187
+test_truth_tracking_kalman[odd-1000.0]__trackstates_kf.root: fdc028cf66101204f903b776381bb71fc98dd8599db05e4aec9f23bba20cd591
+test_truth_tracking_kalman[odd-1000.0]__tracksummary_kf.root: d6043f7c898430a3bd73100f8b730c3d82a9d48bbc7609426811bd2ccfb56e98
+test_strip_spacepoints[odd]__strip_spacepoints.root: bfc72d8fff76f0af305134bcdb09f0a897a4853bff9ed453be5d3a4294f1d191
diff --git a/Examples/Scripts/Python/truth_tracking_kalman.py b/Examples/Scripts/Python/truth_tracking_kalman.py
index fd383538e2f..ffd6eed937b 100755
--- a/Examples/Scripts/Python/truth_tracking_kalman.py
+++ b/Examples/Scripts/Python/truth_tracking_kalman.py
@@ -19,6 +19,7 @@ def runTruthTrackingKalman(
     decorators=[],
     reverseFilteringMomThreshold=0 * u.GeV,
     reverseFilteringCovarianceScaling=1,
+    seed: int = 42,
     s: acts.examples.Sequencer = None,
 ):
     from acts.examples.simulation import (
@@ -45,7 +46,7 @@ def runTruthTrackingKalman(
     for d in decorators:
         s.addContextDecorator(d)
 
-    rnd = acts.examples.RandomNumbers(seed=42)
+    rnd = acts.examples.RandomNumbers(seed=seed)
     outputDir = Path(outputDir)
 
     logger = acts.logging.getLogger("Truth tracking example")
diff --git a/Examples/Scripts/Python/truth_tracking_kalman_refitting.py b/Examples/Scripts/Python/truth_tracking_kalman_refitting.py
index 86c4381faf9..255eb8c3c8a 100755
--- a/Examples/Scripts/Python/truth_tracking_kalman_refitting.py
+++ b/Examples/Scripts/Python/truth_tracking_kalman_refitting.py
@@ -19,6 +19,7 @@ def runRefittingKf(
     energyLoss: bool = True,
     reverseFilteringMomThreshold=0 * u.GeV,
     reverseFilteringCovarianceScaling=1.0,
+    seed: int = 42,
     s: acts.examples.Sequencer = None,
 ):
     s = runTruthTrackingKalman(
@@ -28,6 +29,7 @@ def runRefittingKf(
         outputDir=outputDir,
         reverseFilteringMomThreshold=reverseFilteringMomThreshold,
         reverseFilteringCovarianceScaling=reverseFilteringCovarianceScaling,
+        seed=seed,
         s=s,
     )