diff --git a/packages/three-vrm-materials-mtoon/src/shaders/mtoon.frag b/packages/three-vrm-materials-mtoon/src/shaders/mtoon.frag
index 89d22b126..7d74e793c 100644
--- a/packages/three-vrm-materials-mtoon/src/shaders/mtoon.frag
+++ b/packages/three-vrm-materials-mtoon/src/shaders/mtoon.frag
@@ -577,7 +577,13 @@ void main() {
       shadow = 1.0;
       #if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_POINT_LIGHT_SHADOWS )
       pointLightShadow = pointLightShadows[ i ];
-      shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getPointShadow( pointShadowMap[ i ], pointLightShadow.shadowMapSize, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ i ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;
+      // COMPAT: pre-r166
+      // r166 introduced shadowIntensity
+      #if THREE_VRM_THREE_REVISION >= 166
+        shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getPointShadow( pointShadowMap[ i ], pointLightShadow.shadowMapSize, pointLightShadow.shadowIntensity, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ i ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;
+      #else
+        shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getPointShadow( pointShadowMap[ i ], pointLightShadow.shadowMapSize, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ i ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;
+      #endif
       #endif
 
       // COMPAT: pre-r156 uses a struct GeometricContext
@@ -614,7 +620,13 @@ void main() {
       shadow = 1.0;
       #if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_SPOT_LIGHT_SHADOWS )
       spotLightShadow = spotLightShadows[ i ];
-      shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( spotShadowMap[ i ], spotLightShadow.shadowMapSize, spotLightShadow.shadowBias, spotLightShadow.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;
+      // COMPAT: pre-r166
+      // r166 introduced shadowIntensity
+      #if THREE_VRM_THREE_REVISION >= 166
+        shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( spotShadowMap[ i ], spotLightShadow.shadowMapSize, spotLightShadow.shadowIntensity, spotLightShadow.shadowBias, spotLightShadow.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;
+      #else
+        shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( spotShadowMap[ i ], spotLightShadow.shadowMapSize, spotLightShadow.shadowBias, spotLightShadow.shadowRadius, vSpotShadowCoord[ i ] ) : 1.0;
+      #endif
       #endif
 
       // COMPAT: pre-r156 uses a struct GeometricContext
@@ -651,7 +663,13 @@ void main() {
       shadow = 1.0;
       #if defined( USE_SHADOWMAP ) && ( UNROLLED_LOOP_INDEX < NUM_DIR_LIGHT_SHADOWS )
       directionalLightShadow = directionalLightShadows[ i ];
-      shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( directionalShadowMap[ i ], directionalLightShadow.shadowMapSize, directionalLightShadow.shadowBias, directionalLightShadow.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;
+      // COMPAT: pre-r166
+      // r166 introduced shadowIntensity
+      #if THREE_VRM_THREE_REVISION >= 166
+        shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( directionalShadowMap[ i ], directionalLightShadow.shadowMapSize, directionalLightShadow.shadowIntensity, directionalLightShadow.shadowBias, directionalLightShadow.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;
+      #else
+        shadow = all( bvec2( directLight.visible, receiveShadow ) ) ? getShadow( directionalShadowMap[ i ], directionalLightShadow.shadowMapSize, directionalLightShadow.shadowBias, directionalLightShadow.shadowRadius, vDirectionalShadowCoord[ i ] ) : 1.0;
+      #endif
       #endif
 
       // COMPAT: pre-r156 uses a struct GeometricContext