diff --git a/Pipfile b/Pipfile
index 4dbf561844..cab3ece65a 100644
--- a/Pipfile
+++ b/Pipfile
@@ -24,7 +24,7 @@ types-toml = "==0.10.8.7"
 python-dotenv = "==1.0.0"
 requests = "==2.31.0"
 Pillow = ">=7.1.2"
-opencv-python = "==4.8.1.78"
+opencv-python = "==4.9.0.80"
 pyperclip = "==1.8.2"
 click = "==8.1.7"
 psycopg2-binary = "==2.9.9"
diff --git a/Pipfile.lock b/Pipfile.lock
index 0181b1cf85..1a325b39fd 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "85f4a4fb239674dd7734a62777545b4421364d3b2fd924a4d4999abf64d13465"
+            "sha256": "365a109d81942e39c911969118e6c907d45978eff734c71980e7495451478977"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -893,17 +893,17 @@
         },
         "opencv-python": {
             "hashes": [
-                "sha256:91d5f6f5209dc2635d496f6b8ca6573ecdad051a09e6b5de4c399b8e673c60da",
-                "sha256:9814beca408d3a0eca1bae7e3e5be68b07c17ecceb392b94170881216e09b319",
-                "sha256:a7aac3900fbacf55b551e7b53626c3dad4c71ce85643645c43e91fcb19045e47",
-                "sha256:b983197f97cfa6fcb74e1da1802c7497a6f94ed561aba6980f1f33123f904956",
-                "sha256:bc31f47e05447da8b3089faa0a07ffe80e114c91ce0b171e6424f9badbd1c5cd",
-                "sha256:c4c406bdb41eb21ea51b4e90dfbc989c002786c3f601c236a99c59a54670a394",
-                "sha256:cc7adbbcd1112877a39274106cb2752e04984bc01a031162952e97450d6117f6"
+                "sha256:1a9f0e6267de3a1a1db0c54213d022c7c8b5b9ca4b580e80bdc58516c922c9e1",
+                "sha256:3f16f08e02b2a2da44259c7cc712e779eff1dd8b55fdb0323e8cab09548086c0",
+                "sha256:71dfb9555ccccdd77305fc3dcca5897fbf0cf28b297c51ee55e079c065d812a3",
+                "sha256:7b34a52e9da36dda8c151c6394aed602e4b17fa041df0b9f5b93ae10b0fcca2a",
+                "sha256:7e5f7aa4486651a6ebfa8ed4b594b65bd2d2f41beeb4241a3e4b1b85acbbbadb",
+                "sha256:dcf000c36dd1651118a2462257e3a9e76db789a78432e1f303c7bac54f63ef6c",
+                "sha256:e4088cab82b66a3b37ffc452976b14a3c599269c247895ae9ceb4066d8188a57"
             ],
             "index": "pypi",
             "markers": "python_version >= '3.6'",
-            "version": "==4.8.1.78"
+            "version": "==4.9.0.80"
         },
         "packaging": {
             "hashes": [
diff --git a/library/hatomap.py b/library/hatomap.py
index 5478072ef1..db0864abc9 100644
--- a/library/hatomap.py
+++ b/library/hatomap.py
@@ -357,12 +357,26 @@ def get_image(self, bbox: WebMercatorPixelBBox) -> np.ndarray:
 
         if self.brightness != 1.0 or self.chroma != 1.0:
             img_hsv = cv2.cvtColor(layer_img, cv2.COLOR_BGR2HSV)
-            img_hsv[..., 1] = img_hsv[..., 1] * self.brightness
-            img_hsv[..., 2] = img_hsv[..., 2] * self.chroma
+            img_hsv = img_hsv.astype(np.float32)  # HSV値をfloatに変換
+
+            # 中間変数を使用（self.brightness と self.chroma を直接使用）
+            hsv_1 = img_hsv[..., 1] * self.brightness
+            hsv_2 = img_hsv[..., 2] * self.chroma
+
+            # 型アサーションを追加
+            assert hsv_1.dtype == np.float32 and hsv_2.dtype == np.float32
+
+            img_hsv[..., 1] = np.clip(hsv_1, 0, 255)
+            img_hsv[..., 2] = np.clip(hsv_2, 0, 255)
+            img_hsv = img_hsv.astype(np.uint8)  # HSV値を元の型に戻す
             layer_img = cv2.cvtColor(img_hsv, cv2.COLOR_HSV2BGR)
 
         if self.opacity != 1.0:
-            layer_img[layer_img[..., 3] != 0, 3] = int(round(self.opacity * 256))
+            layer_img = layer_img.astype(np.float32)  # HSV値をfloatに変換
+            layer_img[layer_img[..., 3] != 0, 3] = np.clip(
+                layer_img[layer_img[..., 3] != 0, 3] * self.opacity * 256, 0, 255
+            )
+            layer_img = layer_img.astype(np.uint8)  # 画像を元の型に戻す
 
         return layer_img