diff --git a/package.json b/package.json
index 7e92c92..9fe1514 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "@types/jest": "26.0.20",
     "@types/node": "14.14.25",
     "jest": "26.6.3",
-    "prettier": "2.2.1",
+    "prettier": "2.3.1",
     "ts-jest": "26.5.0",
     "typescript": "4.1.3"
   },
diff --git a/packages/demo/canvas.ts b/packages/demo/canvas.ts
index 3aee4c4..08a9463 100644
--- a/packages/demo/canvas.ts
+++ b/packages/demo/canvas.ts
@@ -21,17 +21,16 @@ export const drawOptions = {
   },
 };
 
-const getPointedCell = (canvas: HTMLCanvasElement) => ({
-  pageX,
-  pageY,
-}: MouseEvent) => {
-  const { left, top } = canvas.getBoundingClientRect();
+const getPointedCell =
+  (canvas: HTMLCanvasElement) =>
+  ({ pageX, pageY }: MouseEvent) => {
+    const { left, top } = canvas.getBoundingClientRect();
 
-  const x = Math.floor((pageX - left) / drawOptions.sizeCell) - 1;
-  const y = Math.floor((pageY - top) / drawOptions.sizeCell) - 2;
+    const x = Math.floor((pageX - left) / drawOptions.sizeCell) - 1;
+    const y = Math.floor((pageY - top) / drawOptions.sizeCell) - 2;
 
-  return { x, y };
-};
+    return { x, y };
+  };
 
 export const createCanvas = ({
   width,
diff --git a/yarn.lock b/yarn.lock
index f4c434e..2f09d4d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5047,10 +5047,10 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
-prettier@2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.2.1.tgz#795a1a78dd52f073da0cd42b21f9c91381923ff5"
-  integrity sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q==
+prettier@2.3.1:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.1.tgz#76903c3f8c4449bc9ac597acefa24dc5ad4cbea6"
+  integrity sha512-p+vNbgpLjif/+D+DwAZAbndtRrR0md0MwfmOVN9N+2RgyACMT+7tfaRnT+WDPkqnuVwleyuBIG2XBxKDme3hPA==
 
 pretty-error@^2.1.1:
   version "2.1.1"