diff --git a/requirements.txt b/requirements.txt
index 61ce085..6a2e232 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 build==0.7.0
-Cython==0.29.35
+Cython>=3.0.0
 wheel==0.40.0
-pyscipopt==4.4.0
+pyscipopt>=4.4.0
diff --git a/src/pygcgopt/detector.pxi b/src/pygcgopt/detector.pxi
index c0cd84a..c5e470a 100644
--- a/src/pygcgopt/detector.pxi
+++ b/src/pygcgopt/detector.pxi
@@ -75,23 +75,23 @@ cdef wrap_detector_callback_result(Detector detector, PARTIALDEC_DETECTION_DATA*
     result[0] = result_dict.get("result", <SCIP_RESULT>result[0])
 
 
-cdef SCIP_RETCODE PyDetectorFree (SCIP* scip, DEC_DETECTOR* detector):
+cdef SCIP_RETCODE PyDetectorFree (SCIP* scip, DEC_DETECTOR* detector) noexcept:
     py_detector = get_py_detector(detector)
     py_detector.freeDetector()
     Py_DECREF(py_detector)
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorInit (SCIP* scip, DEC_DETECTOR* detector):
+cdef SCIP_RETCODE PyDetectorInit (SCIP* scip, DEC_DETECTOR* detector) noexcept:
     py_detector = get_py_detector(detector)
     py_detector.initDetector()
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorExit (SCIP* scip, DEC_DETECTOR* detector):
+cdef SCIP_RETCODE PyDetectorExit (SCIP* scip, DEC_DETECTOR* detector) noexcept:
     py_detector = get_py_detector(detector)
     py_detector.exitDetector()
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorPropagatePartialdec (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result):
+cdef SCIP_RETCODE PyDetectorPropagatePartialdec (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result) noexcept:
     cdef SCIP_CLOCK* clock = start_new_clock(scip)
 
     py_detector = get_py_detector(detector)
@@ -104,7 +104,7 @@ cdef SCIP_RETCODE PyDetectorPropagatePartialdec (SCIP* scip, DEC_DETECTOR* detec
 
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorFinishPartialdec (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result):
+cdef SCIP_RETCODE PyDetectorFinishPartialdec (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result) noexcept:
     cdef SCIP_CLOCK* clock = start_new_clock(scip)
 
     py_detector = get_py_detector(detector)
@@ -117,7 +117,7 @@ cdef SCIP_RETCODE PyDetectorFinishPartialdec (SCIP* scip, DEC_DETECTOR* detector
 
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorPostprocessPartialdec (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result):
+cdef SCIP_RETCODE PyDetectorPostprocessPartialdec (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result) noexcept:
     cdef SCIP_CLOCK* clock = start_new_clock(scip)
 
     py_detector = get_py_detector(detector)
@@ -130,19 +130,19 @@ cdef SCIP_RETCODE PyDetectorPostprocessPartialdec (SCIP* scip, DEC_DETECTOR* det
 
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorSetParamAggressive (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result):
+cdef SCIP_RETCODE PyDetectorSetParamAggressive (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result) noexcept:
     py_detector = get_py_detector(detector)
     result_dict = py_detector.setParamAggressive() or {}
     result[0] = result_dict.get("result", <SCIP_RESULT>result[0])
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorSetParamDefault (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result):
+cdef SCIP_RETCODE PyDetectorSetParamDefault (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result) noexcept:
     py_detector = get_py_detector(detector)
     result_dict = py_detector.setParamDefault() or {}
     result[0] = result_dict.get("result", <SCIP_RESULT>result[0])
     return SCIP_OKAY
 
-cdef SCIP_RETCODE PyDetectorSetParamFast (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result):
+cdef SCIP_RETCODE PyDetectorSetParamFast (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result) noexcept:
     py_detector = get_py_detector(detector)
     result_dict = py_detector.setParamFast() or {}
     result[0] = result_dict.get("result", <SCIP_RESULT>result[0])
diff --git a/src/pygcgopt/gcg.pxd b/src/pygcgopt/gcg.pxd
index 32f57c5..e64b2c0 100644
--- a/src/pygcgopt/gcg.pxd
+++ b/src/pygcgopt/gcg.pxd
@@ -53,7 +53,33 @@ cdef extern from "gcg/gcg.h":
         int nnewpartialdecs
         double detectiontime
 
-    SCIP_RETCODE DECincludeDetector(SCIP* scip, const char* name, const char decchar, const char* description, int freqCallRound, int maxCallRound, int minCallRound, int freqCallRoundOriginal, int maxCallRoundOriginal, int minCallRoundOriginal, int priority, SCIP_Bool enabled, SCIP_Bool enabledFinishing, SCIP_Bool enabledPostprocessing, SCIP_Bool skip, SCIP_Bool usefulRecall, DEC_DETECTORDATA *detectordata, SCIP_RETCODE (*freeDetector) (SCIP* scip, DEC_DETECTOR* detector), SCIP_RETCODE (*initDetector) (SCIP* scip, DEC_DETECTOR* detector), SCIP_RETCODE (*exitDetector) (SCIP* scip, DEC_DETECTOR* detector), SCIP_RETCODE (*propagatePartialdecDetector) (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result), SCIP_RETCODE (*finishPartialdecDetector) (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result), SCIP_RETCODE (*postprocessPartialdecDetector) (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result), SCIP_RETCODE (*setParamAggressiveDetector) (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result), SCIP_RETCODE (*setParamDefaultDetector) (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result), SCIP_RETCODE (*setParamFastDetector) (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result))
+    SCIP_RETCODE DECincludeDetector(
+        SCIP* scip, const char* name, 
+        const char decchar, 
+        const char* description, 
+        int freqCallRound, 
+        int maxCallRound, 
+        int minCallRound, 
+        int freqCallRoundOriginal, 
+        int maxCallRoundOriginal, 
+        int minCallRoundOriginal, 
+        int priority, 
+        SCIP_Bool enabled, 
+        SCIP_Bool enabledFinishing, 
+        SCIP_Bool enabledPostprocessing, 
+        SCIP_Bool skip, 
+        SCIP_Bool usefulRecall, 
+        DEC_DETECTORDATA *detectordata, 
+        SCIP_RETCODE (*freeDetector) (SCIP* scip, DEC_DETECTOR* detector) noexcept, 
+        SCIP_RETCODE (*initDetector) (SCIP* scip, DEC_DETECTOR* detector) noexcept, 
+        SCIP_RETCODE (*exitDetector) (SCIP* scip, DEC_DETECTOR* detector) noexcept, 
+        SCIP_RETCODE (*propagatePartialdecDetector) (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result) noexcept, 
+        SCIP_RETCODE (*finishPartialdecDetector) (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result) noexcept, 
+        SCIP_RETCODE (*postprocessPartialdecDetector) (SCIP* scip, DEC_DETECTOR* detector, PARTIALDEC_DETECTION_DATA* partialdecdetectiondata, SCIP_RESULT* result) noexcept, 
+        SCIP_RETCODE (*setParamAggressiveDetector) (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result) noexcept, 
+        SCIP_RETCODE (*setParamDefaultDetector) (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result) noexcept, 
+        SCIP_RETCODE (*setParamFastDetector) (SCIP* scip, DEC_DETECTOR* detector, SCIP_RESULT* result) noexcept
+    )
 
     DEC_DETECTORDATA* DECdetectorGetData(DEC_DETECTOR* detector)
 
@@ -103,14 +129,14 @@ cdef extern from "gcg/pricer_gcg.h":
         int priority,
         SCIP_Bool heurenabled,
         SCIP_Bool exactenabled,
-        SCIP_RETCODE (*solverupdate) (SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Bool varobjschanged, SCIP_Bool varbndschanged, SCIP_Bool consschanged),
-        SCIP_RETCODE (*solversolve) (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status),
-        SCIP_RETCODE (*solveheur) (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status),
-        SCIP_RETCODE (*solverfree) (SCIP* scip, GCG_SOLVER* solver),
-        SCIP_RETCODE (*solverinit) (SCIP* scip, GCG_SOLVER* solver),
-        SCIP_RETCODE (*solverexit) (SCIP* scip, GCG_SOLVER* solver),
-        SCIP_RETCODE (*solverinitsol) (SCIP* scip, GCG_SOLVER* solver),
-        SCIP_RETCODE (*solverexitsol) (SCIP* scip, GCG_SOLVER* solver),
+        SCIP_RETCODE (*solverupdate) (SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Bool varobjschanged, SCIP_Bool varbndschanged, SCIP_Bool consschanged) noexcept,
+        SCIP_RETCODE (*solversolve) (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status) noexcept,
+        SCIP_RETCODE (*solveheur) (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status) noexcept,
+        SCIP_RETCODE (*solverfree) (SCIP* scip, GCG_SOLVER* solver) noexcept,
+        SCIP_RETCODE (*solverinit) (SCIP* scip, GCG_SOLVER* solver) noexcept,
+        SCIP_RETCODE (*solverexit) (SCIP* scip, GCG_SOLVER* solver) noexcept,
+        SCIP_RETCODE (*solverinitsol) (SCIP* scip, GCG_SOLVER* solver) noexcept,
+        SCIP_RETCODE (*solverexitsol) (SCIP* scip, GCG_SOLVER* solver) noexcept,
         GCG_SOLVERDATA*       solverdata
     )
     GCG_SOLVER** GCGpricerGetSolvers(SCIP* scip)
diff --git a/src/pygcgopt/pricing_solver.pxi b/src/pygcgopt/pricing_solver.pxi
index a7b8b48..64e3ef8 100644
--- a/src/pygcgopt/pricing_solver.pxi
+++ b/src/pygcgopt/pricing_solver.pxi
@@ -36,45 +36,45 @@ cdef PricingSolver get_py_pricing_solver(GCG_SOLVER* pricingSolver):
     return py_pricing_solver
 
 
-cdef SCIP_RETCODE PyPricingSolverFree (SCIP* scip, GCG_SOLVER* solver):
+cdef SCIP_RETCODE PyPricingSolverFree (SCIP* scip, GCG_SOLVER* solver) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricing_solver.freeSolver()
     Py_DECREF(py_pricing_solver)
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverInit (SCIP* scip, GCG_SOLVER* solver):
+cdef SCIP_RETCODE PyPricingSolverInit (SCIP* scip, GCG_SOLVER* solver) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricing_solver.initSolver()
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverExit (SCIP* scip, GCG_SOLVER* solver):
+cdef SCIP_RETCODE PyPricingSolverExit (SCIP* scip, GCG_SOLVER* solver) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricing_solver.exitSolver()
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverInitSol (SCIP* scip, GCG_SOLVER* solver):
+cdef SCIP_RETCODE PyPricingSolverInitSol (SCIP* scip, GCG_SOLVER* solver) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricing_solver.initSolution()
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverExitSol (SCIP* scip, GCG_SOLVER* solver):
+cdef SCIP_RETCODE PyPricingSolverExitSol (SCIP* scip, GCG_SOLVER* solver) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricing_solver.exitSolution()
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverUpdate (SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Bool varobjschanged, SCIP_Bool varbndschanged, SCIP_Bool consschanged):
+cdef SCIP_RETCODE PyPricingSolverUpdate (SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Bool varobjschanged, SCIP_Bool varbndschanged, SCIP_Bool consschanged) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricingprob = GCGPricingModel.create(pricingprob)
     py_pricing_solver.updateSolver(py_pricingprob, probnr, varobjschanged, varbndschanged, consschanged)
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverSolve (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status):
+cdef SCIP_RETCODE PyPricingSolverSolve (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricingprob = GCGPricingModel.create(pricingprob)
     result_dict = py_pricing_solver.solve(py_pricingprob, probnr, dualsolconv)
@@ -83,7 +83,7 @@ cdef SCIP_RETCODE PyPricingSolverSolve (SCIP* scip, SCIP* pricingprob, GCG_SOLVE
     return SCIP_OKAY
 
 
-cdef SCIP_RETCODE PyPricingSolverSolveHeur (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status):
+cdef SCIP_RETCODE PyPricingSolverSolveHeur (SCIP* scip, SCIP* pricingprob, GCG_SOLVER* solver, int probnr, SCIP_Real dualsolconv, SCIP_Real* lowerbound, GCG_PRICINGSTATUS* status) noexcept:
     py_pricing_solver = get_py_pricing_solver(solver)
     py_pricingprob = GCGPricingModel.create(pricingprob)
     result_dict = py_pricing_solver.solveHeuristic(py_pricingprob, probnr, dualsolconv)