diff --git a/CHANGELOG.md b/CHANGELOG.md
index a8db94c..5162b03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 
+## [5-r.1-beta.3] - 2023-10-12
+
+### Added
+
+* Add `clamp()` to CubismMath.
+
 
 ## [5-r.1-beta.2] - 2023-09-28
 
@@ -320,6 +326,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * Fix invalid expressions of `CubismCdiJson`.
 
 
+[5-r.1-beta.3]: https://github.com/Live2D/CubismNativeFramework/compare/5-r.1-beta.2...5-r.1-beta.3
 [5-r.1-beta.2]: https://github.com/Live2D/CubismNativeFramework/compare/5-r.1-beta.1...5-r.1-beta.2
 [5-r.1-beta.1]: https://github.com/Live2D/CubismNativeFramework/compare/4-r.7...5-r.1-beta.1
 [4-r.7]: https://github.com/Live2D/CubismNativeFramework/compare/4-r.6.2...4-r.7
diff --git a/src/Math/CubismMath.cpp b/src/Math/CubismMath.cpp
index edcf138..1a59dde 100644
--- a/src/Math/CubismMath.cpp
+++ b/src/Math/CubismMath.cpp
@@ -12,6 +12,34 @@ namespace Live2D {namespace Cubism {namespace Framework {
 const csmFloat32 CubismMath::Pi = 3.1415926535897932384626433832795f;
 const csmFloat32 CubismMath::Epsilon = 0.00001f;
 
+csmInt32 CubismMath::Clamp(csmInt32 val, csmInt32 min, csmInt32 max)
+{
+    if (val < min)
+    {
+        return min;
+    }
+    else if (max < val)
+    {
+        return max;
+    }
+
+    return val;
+}
+
+csmFloat32 CubismMath::ClampF(csmFloat32 val, csmFloat32 min, csmFloat32 max)
+{
+    if (val < min)
+    {
+        return min;
+    }
+    else if (max < val)
+    {
+        return max;
+    }
+
+    return val;
+}
+
 csmFloat32 CubismMath::DegreesToRadian(csmFloat32 degrees)
 {
     return (degrees / 180.0f) * Pi;
diff --git a/src/Math/CubismMath.hpp b/src/Math/CubismMath.hpp
index 186c52b..8ab3dba 100644
--- a/src/Math/CubismMath.hpp
+++ b/src/Math/CubismMath.hpp
@@ -122,6 +122,26 @@ class CubismMath
         return (l > r) ? r : l;
     }
 
+    /**
+     * @brief  値を範囲内に納めて返す
+     *
+     * @param  val  ->  範囲内か確認する値
+     * @param  min  ->  最小値
+     * @param  max  ->  最大値
+     * @return 範囲内に収まった値
+     */
+    static csmInt32 Clamp(csmInt32 val, csmInt32 min, csmInt32 max);
+
+    /**
+     * @brief  値を範囲内に納めて返す
+     *
+     * @param  val  ->  範囲内か確認する値
+     * @param  min  ->  最小値
+     * @param  max  ->  最大値
+     * @return 範囲内に収まった値
+     */
+    static csmFloat32 ClampF(csmFloat32 val, csmFloat32 min, csmFloat32 max);
+
     /**
      * @brief   角度値をラジアン値に変換します。
      *