diff --git a/packages/three-vrm-core/src/expressions/VRMExpressionMaterialColorType.ts b/packages/three-vrm-core/src/expressions/VRMExpressionMaterialColorType.ts
index 6bf9697ae..733e39941 100644
--- a/packages/three-vrm-core/src/expressions/VRMExpressionMaterialColorType.ts
+++ b/packages/three-vrm-core/src/expressions/VRMExpressionMaterialColorType.ts
@@ -9,7 +9,8 @@ export const VRMExpressionMaterialColorType = {
   OutlineColor: 'outlineColor',
 } as const;
 
-export type VRMExpressionMaterialColorType = typeof VRMExpressionMaterialColorType[keyof typeof VRMExpressionMaterialColorType];
+export type VRMExpressionMaterialColorType =
+  typeof VRMExpressionMaterialColorType[keyof typeof VRMExpressionMaterialColorType];
 
 export const v0ExpressionMaterialColorMap: { [key: string]: VRMExpressionMaterialColorType | undefined } = {
   _Color: VRMExpressionMaterialColorType.Color,
diff --git a/packages/three-vrm-core/src/firstPerson/VRMFirstPersonMeshAnnotationType.ts b/packages/three-vrm-core/src/firstPerson/VRMFirstPersonMeshAnnotationType.ts
index 98f898233..d2748e1e7 100644
--- a/packages/three-vrm-core/src/firstPerson/VRMFirstPersonMeshAnnotationType.ts
+++ b/packages/three-vrm-core/src/firstPerson/VRMFirstPersonMeshAnnotationType.ts
@@ -7,4 +7,5 @@ export const VRMFirstPersonMeshAnnotationType = {
   FirstPersonOnly: 'firstPersonOnly',
 } as const;
 
-export type VRMFirstPersonMeshAnnotationType = typeof VRMFirstPersonMeshAnnotationType[keyof typeof VRMFirstPersonMeshAnnotationType];
+export type VRMFirstPersonMeshAnnotationType =
+  typeof VRMFirstPersonMeshAnnotationType[keyof typeof VRMFirstPersonMeshAnnotationType];
diff --git a/packages/three-vrm-core/src/humanoid/VRMHumanBones.ts b/packages/three-vrm-core/src/humanoid/VRMHumanBones.ts
index 6f2d0b473..ec2eec301 100644
--- a/packages/three-vrm-core/src/humanoid/VRMHumanBones.ts
+++ b/packages/three-vrm-core/src/humanoid/VRMHumanBones.ts
@@ -5,5 +5,6 @@ import type { VRMRequiredHumanBoneName } from './VRMRequiredHumanBoneName';
 /**
  * A map from {@link VRMHumanBoneName} to {@link VRMHumanBone}.
  */
-export type VRMHumanBones = { [name in VRMHumanBoneName]?: VRMHumanBone } &
-  { [name in VRMRequiredHumanBoneName]: VRMHumanBone };
+export type VRMHumanBones = { [name in VRMHumanBoneName]?: VRMHumanBone } & {
+  [name in VRMRequiredHumanBoneName]: VRMHumanBone;
+};
diff --git a/packages/three-vrm-core/src/humanoid/VRMHumanoidRig.ts b/packages/three-vrm-core/src/humanoid/VRMHumanoidRig.ts
index eb31407d6..44c56d1e2 100644
--- a/packages/three-vrm-core/src/humanoid/VRMHumanoidRig.ts
+++ b/packages/three-vrm-core/src/humanoid/VRMHumanoidRig.ts
@@ -11,9 +11,7 @@ const _quatA = new THREE.Quaternion();
  * A class represents the normalized Rig of a VRM.
  */
 export class VRMHumanoidRig extends VRMRig {
-  protected static _setupTransforms(
-    modelRig: VRMRig,
-  ): {
+  protected static _setupTransforms(modelRig: VRMRig): {
     rigBones: VRMHumanBones;
     root: THREE.Object3D;
     parentWorldRotations: { [boneName in VRMHumanBoneName]?: THREE.Quaternion };
diff --git a/packages/three-vrm-materials-mtoon/src/MToonMaterialOutlineWidthMode.ts b/packages/three-vrm-materials-mtoon/src/MToonMaterialOutlineWidthMode.ts
index 98d9ed411..b1272e786 100644
--- a/packages/three-vrm-materials-mtoon/src/MToonMaterialOutlineWidthMode.ts
+++ b/packages/three-vrm-materials-mtoon/src/MToonMaterialOutlineWidthMode.ts
@@ -6,4 +6,5 @@ export const MToonMaterialOutlineWidthMode = {
   ScreenCoordinates: 'screenCoordinates',
 } as const;
 
-export type MToonMaterialOutlineWidthMode = typeof MToonMaterialOutlineWidthMode[keyof typeof MToonMaterialOutlineWidthMode];
+export type MToonMaterialOutlineWidthMode =
+  typeof MToonMaterialOutlineWidthMode[keyof typeof MToonMaterialOutlineWidthMode];
diff --git a/yarn.lock b/yarn.lock
index 2f4dbce1c..7f215f0d1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6593,9 +6593,9 @@ prelude-ls@~1.1.2:
   integrity sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=
 
 prettier@^2.1.2:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.2.1.tgz#795a1a78dd52f073da0cd42b21f9c91381923ff5"
-  integrity sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q==
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.7.1.tgz#e235806850d057f97bb08368a4f7d899f7760c64"
+  integrity sha512-ujppO+MkdPqoVINuDFDRLClm7D78qbDt0/NR+wp5FqEZOoTNAjPHWj17QRhu7geIHJfcNhRk1XVQmF8Bp3ye+g==
 
 pretty-format@^26.0.0, pretty-format@^26.6.2:
   version "26.6.2"