diff --git a/Math/Numerics/Interpolation/CubicSplineInterpolation.php b/Math/Numerics/Interpolation/CubicSplineInterpolation.php
index 8bdc007d9..32fac36b6 100644
--- a/Math/Numerics/Interpolation/CubicSplineInterpolation.php
+++ b/Math/Numerics/Interpolation/CubicSplineInterpolation.php
@@ -25,7 +25,7 @@ use phpOMS\Math\Matrix\Vector;
  * @link    https://orange-management.org
  * @since   1.0.0
  */
-class CubicSplineInterpolation implements InterpolationInterface
+final class CubicSplineInterpolation implements InterpolationInterface
 {
     /**
      * Points for spline interpolation
diff --git a/Math/Numerics/Interpolation/LagrangeInterpolation.php b/Math/Numerics/Interpolation/LagrangeInterpolation.php
index 37ff47750..e6f81d768 100644
--- a/Math/Numerics/Interpolation/LagrangeInterpolation.php
+++ b/Math/Numerics/Interpolation/LagrangeInterpolation.php
@@ -22,7 +22,7 @@ namespace phpOMS\Math\Numerics\Interpolation;
  * @link    https://orange-management.org
  * @since   1.0.0
  */
-class LagrangeInterpolation implements InterpolationInterface
+final class LagrangeInterpolation implements InterpolationInterface
 {
     /**
      * Points for spline interpolation
diff --git a/Math/Numerics/Interpolation/LinearInterpolation.php b/Math/Numerics/Interpolation/LinearInterpolation.php
index 5f1c15b33..ca469d45e 100644
--- a/Math/Numerics/Interpolation/LinearInterpolation.php
+++ b/Math/Numerics/Interpolation/LinearInterpolation.php
@@ -24,7 +24,7 @@ use phpOMS\Math\Matrix\Vector;
  * @link    https://orange-management.org
  * @since   1.0.0
  */
-class LinearInterpolation implements InterpolationInterface
+final class LinearInterpolation implements InterpolationInterface
 {
         /**
      * Points for spline interpolation