diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 22c7eaa..7ddf4ad 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -26,6 +26,13 @@ TODO: in `main.cpp` check the returned policy of pybind11 and also the `py::call
 TODO: a cpp class that is able to compute (DC powerflow) ContingencyAnalysis and TimeSeries using PTDF and LODF
 TODO: integration test with pandapower (see `pandapower/contingency/contingency.py` and import `lightsim2grid_installed` and check it's True)
 
+[0.9.2.post1] 2024-11-28
+--------------------------
+- [FIXED] There is still a bug with the pypowsybl 1.8.1 version with the 
+  tap changer ratio (unconsistency between what needs to be done and the 
+  actual documentation). The fix is to set the const variable `PP_BUG_RATIO_TAP_CHANGER`
+  to be at least 1.9.0, otherwise results are wrong.
+  
 [0.9.2] 2024-10-18
 --------------------------
 - [ADDED] support loading a grid when everything is NOT on the same bus
diff --git a/benchmarks/benchmark_grid_size.py b/benchmarks/benchmark_grid_size.py
index 1d5578e..bbc2b62 100644
--- a/benchmarks/benchmark_grid_size.py
+++ b/benchmarks/benchmark_grid_size.py
@@ -55,7 +55,7 @@
               "case9241pegase.json"
               ]
 
-def make_grid2op_env(pp_case, casse_name, load_p, load_q, gen_p, sgen_p):
+def make_grid2op_env(pp_case, case_name, load_p, load_q, gen_p, sgen_p):
     param = Parameters.Parameters()
     param.init_from_dict({"NO_OVERFLOW_DISCONNECTION": True})
         
@@ -75,7 +75,7 @@ def make_grid2op_env(pp_case, casse_name, load_p, load_q, gen_p, sgen_p):
     return env_lightsim
 
 
-def make_grid2op_env_pp(pp_case, casse_name, load_p, load_q, gen_p, sgen_p):
+def make_grid2op_env_pp(pp_case, case_name, load_p, load_q, gen_p, sgen_p):
     param = Parameters.Parameters()
     param.init_from_dict({"NO_OVERFLOW_DISCONNECTION": True})
         
diff --git a/docs/conf.py b/docs/conf.py
index 4812d14..6002417 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@
 author = 'Benjamin DONNOT'
 
 # The full version, including alpha/beta/rc tags
-release = "0.9.2"
+release = "0.9.2.post1"
 version = '0.9'
 
 # -- General configuration ---------------------------------------------------
diff --git a/lightsim2grid/__init__.py b/lightsim2grid/__init__.py
index e8001c0..7b02000 100644
--- a/lightsim2grid/__init__.py
+++ b/lightsim2grid/__init__.py
@@ -6,7 +6,7 @@
 # SPDX-License-Identifier: MPL-2.0
 # This file is part of LightSim2grid, LightSim2grid implements a c++ backend targeting the Grid2Op platform.
 
-__version__ = "0.9.2"
+__version__ = "0.9.2.post1"
 
 __all__ = ["newtonpf", "SolverType", "ErrorType", "solver", "compilation_options"]
 
diff --git a/lightsim2grid/gridmodel/from_pypowsybl/_from_pypowsybl.py b/lightsim2grid/gridmodel/from_pypowsybl/_from_pypowsybl.py
index dd06184..0a5cee2 100644
--- a/lightsim2grid/gridmodel/from_pypowsybl/_from_pypowsybl.py
+++ b/lightsim2grid/gridmodel/from_pypowsybl/_from_pypowsybl.py
@@ -14,7 +14,7 @@
 from typing import Optional, Union
 from packaging import version
 
-PP_BUG_RATIO_TAP_CHANGER = version.parse("1.7.0")
+PP_BUG_RATIO_TAP_CHANGER = version.parse("1.9.0")
 PYPOWSYBL_VER = version.parse(pypo.__version__)
 from lightsim2grid_cpp import GridModel
 
diff --git a/setup.py b/setup.py
index 601a779..066687f 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 from pybind11.setup_helpers import Pybind11Extension, build_ext
 
 
-__version__ = "0.9.2"
+__version__ = "0.9.2.post1"
 KLU_SOLVER_AVAILABLE = False
 
 # Try to link against SuiteSparse (if available)
diff --git a/src/powerflow_algorithm/BaseAlgo.cpp b/src/powerflow_algorithm/BaseAlgo.cpp
index 647dfa7..e663721 100644
--- a/src/powerflow_algorithm/BaseAlgo.cpp
+++ b/src/powerflow_algorithm/BaseAlgo.cpp
@@ -28,10 +28,10 @@ void BaseAlgo::reset(){
 
 
 RealVect BaseAlgo::_evaluate_Fx(const Eigen::SparseMatrix<cplx_type> &  Ybus,
-                                  const CplxVect & V,
-                                  const CplxVect & Sbus,
-                                  const Eigen::VectorXi & pv,
-                                  const Eigen::VectorXi & pq)
+                                const CplxVect & V,
+                                const CplxVect & Sbus,
+                                const Eigen::VectorXi & pv,
+                                const Eigen::VectorXi & pq)
 {
     auto timer = CustTimer();
     auto npv = pv.size();