diff --git a/history.md b/history.md
index c2c8dd0..f22ae34 100644
--- a/history.md
+++ b/history.md
@@ -233,5 +233,5 @@
 ### Version 0.5.6 (Aug 25, 2024)
 * Defining material with float refractive index enabled for FDTDSimulation.add_structure_from_gdsii().
 
-### Version 0.5.8 (Sep 4, 2024)
+### Version 0.5.9 (Sep 4, 2024)
 * New pixelated region class: CirclePixelsRegionwithGroup.
\ No newline at end of file
diff --git a/splayout/__init__.py b/splayout/__init__.py
index 4766171..fc040d2 100644
--- a/splayout/__init__.py
+++ b/splayout/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.5.8"
+__version__ = "0.5.9"
 
 ## Submodules
 from . import utils
diff --git a/splayout/components/pixelsregion.py b/splayout/components/pixelsregion.py
index da8b819..bc18f8b 100644
--- a/splayout/components/pixelsregion.py
+++ b/splayout/components/pixelsregion.py
@@ -330,9 +330,10 @@ def update(self, matrix):
             self.__initialize()
         else:
             self.__lastest_array = np.array(masked_matrix,dtype=np.double)
-            self.__last_array = np.array(masked_matrix,dtype=np.double)
-            self.fdtd_engine.fdtd.putv("radius_matrix", self.__lastest_array)
-            self.fdtd_engine.eval("setnamed(\"::model::"+self.group_name+"\",\"radius_matrix\",radius_matrix);")
+            if not (self.__lastest_array == self.__last_array).all():
+                self.__last_array = np.array(masked_matrix,dtype=np.double)
+                self.fdtd_engine.fdtd.putv("radius_matrix", self.__lastest_array)
+                self.fdtd_engine.eval("setnamed(\"::model::"+self.group_name+"\",\"radius_matrix\",radius_matrix);")
 
     def draw_layout(self, matrix, cell, layer):
         '''