diff --git a/package-lock.json b/package-lock.json
index f1f3237bc..e1f72da45 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6326,9 +6326,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.11",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+      "version": "4.17.14",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
+      "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==",
       "dev": true
     },
     "lodash._reinterpolate": {
@@ -6744,9 +6744,9 @@
       }
     },
     "mixin-deep": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/mixin-deep/-/mixin-deep-1.3.1.tgz",
-      "integrity": "sha512-8ZItLHeEgaqEvd5lYBXfm4EZSFCX29Jb9K+lAHhDKzReKBQKj3R+7NOF6tjqYi9t4oI8VUfaWITJQm86wnXGNQ==",
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/mixin-deep/-/mixin-deep-1.3.2.tgz",
+      "integrity": "sha512-WRoDn//mXBiJ1H40rqa3vH0toePwSsGb45iInWlTySa+Uu4k3tYUSxa2v1KqAiLtvlrSzaExqS1gtk96A9zvEA==",
       "dev": true,
       "requires": {
         "for-in": "^1.0.2",
@@ -8344,9 +8344,9 @@
       "dev": true
     },
     "set-value": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.0.tgz",
-      "integrity": "sha512-hw0yxk9GT/Hr5yJEYnHNKYXkIA8mVJgd9ditYZCe16ZczcaELYYcfvaXesNACk2O8O0nTiPQcQhGUQj8JLzeeg==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.1.tgz",
+      "integrity": "sha512-JxHc1weCN68wRY0fhCoXpyK55m/XPHafOmK4UWD7m2CI14GMcFypt4w/0+NV5f/ZMby2F6S2wwA7fgynh9gWSw==",
       "dev": true,
       "requires": {
         "extend-shallow": "^2.0.1",
@@ -9182,38 +9182,15 @@
       "dev": true
     },
     "union-value": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
-      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
       "dev": true,
       "requires": {
         "arr-union": "^3.1.0",
         "get-value": "^2.0.6",
         "is-extendable": "^0.1.1",
-        "set-value": "^0.4.3"
-      },
-      "dependencies": {
-        "extend-shallow": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
-          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
-          "dev": true,
-          "requires": {
-            "is-extendable": "^0.1.0"
-          }
-        },
-        "set-value": {
-          "version": "0.4.3",
-          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
-          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
-          "dev": true,
-          "requires": {
-            "extend-shallow": "^2.0.1",
-            "is-extendable": "^0.1.1",
-            "is-plain-object": "^2.0.1",
-            "to-object-path": "^0.3.0"
-          }
-        }
+        "set-value": "^2.0.1"
       }
     },
     "unique-filename": {
diff --git a/packages/configs/src/fusumarc.js b/packages/configs/src/fusumarc.js
index bbc0e2df6..83894f75a 100644
--- a/packages/configs/src/fusumarc.js
+++ b/packages/configs/src/fusumarc.js
@@ -35,7 +35,8 @@ const config = {
   },
   extends: {
     js: null,
-    css: './style.css'
+    css: './style.css',
+    webpack: null
   }
 };
 
diff --git a/packages/webpack/src/webpack.config.js b/packages/webpack/src/webpack.config.js
index 1b2f8a328..8b0b6067d 100644
--- a/packages/webpack/src/webpack.config.js
+++ b/packages/webpack/src/webpack.config.js
@@ -37,7 +37,7 @@ module.exports = (type, { meta, slide, extends: fileExtends, internal = {}, serv
   // name, url is deprecated TODO: delete
   const { url, name, description, thumbnail, siteName, sns, title } = meta;
   const { sidebar, targetBlank, showIndex, isVertical, loop, code, chart, math } = slide;
-  const { js: jsPath, css: cssPath } = fileExtends;
+  const { js: jsPath, css: cssPath, webpack: webpackPath } = fileExtends;
   const { basePath, remoteOrigin, htmlBody = '' } = internal;
   const outputPath = path.resolve(basePath, 'dist');
   const config = (() => {
@@ -203,5 +203,5 @@ module.exports = (type, { meta, slide, extends: fileExtends, internal = {}, serv
     }
   }
 
-  return merge.smart(common, config);
+  return merge.smart(common, config, webpackPath ? require(path.join(basePath, webpackPath)) : {});
 };