diff --git a/package.json b/package.json
index 96b46b9..9938996 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,6 @@
     "grunt-browserify": "^5.0.0",
     "grunt-contrib-uglify": "^3.1.0",
     "grunt-rollup": "^7.0.0",
-    "rollup-plugin-babel": "^2.4.0"
+    "rollup-plugin-babel": "^4.0.2"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index ac081f7..bda60a6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,6 +2,20 @@
 # yarn lockfile v1
 
 
+"@babel/helper-module-imports@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz#96081b7111e486da4d2cd971ad1a4fe216cc2e3d"
+  dependencies:
+    "@babel/types" "^7.0.0"
+
+"@babel/types@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0.tgz#6e191793d3c854d19c6749989e3bc55f0e962118"
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.17.10"
+    to-fast-properties "^2.0.0"
+
 JSONStream@^0.10.0:
   version "0.10.0"
   resolved "https://registry.yarnpkg.com/JSONStream/-/JSONStream-0.10.0.tgz#74349d0d89522b71f30f0a03ff9bd20ca6f12ac0"
@@ -159,7 +173,7 @@ babel-code-frame@^6.26.0:
     esutils "^2.0.2"
     js-tokens "^3.0.2"
 
-babel-core@6, babel-core@^6.0.12, babel-core@^6.0.14, babel-core@^6.26.0:
+babel-core@^6.0.12, babel-core@^6.0.14, babel-core@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.26.0.tgz#af32f78b31a6fcef119c87b0fd8d9753f03a0bb8"
   dependencies:
@@ -315,7 +329,7 @@ babel-plugin-transform-es2015-block-scoping@^6.24.1:
     babel-types "^6.26.0"
     lodash "^4.17.4"
 
-babel-plugin-transform-es2015-classes@^6.24.1, babel-plugin-transform-es2015-classes@^6.9.0:
+babel-plugin-transform-es2015-classes@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-classes/-/babel-plugin-transform-es2015-classes-6.24.1.tgz#5a4c58a50c9c9461e564b4b2a3bfabc97a2584db"
   dependencies:
@@ -1106,9 +1120,9 @@ esprima@^2.6.0:
   version "2.7.3"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-2.7.3.tgz#96e3b70d5779f6ad49cd032673d1c312767ba581"
 
-estree-walker@^0.2.1:
-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/estree-walker/-/estree-walker-0.2.1.tgz#bdafe8095383d8414d5dc2ecf4c9173b6db9412e"
+estree-walker@^0.5.2:
+  version "0.5.2"
+  resolved "https://registry.yarnpkg.com/estree-walker/-/estree-walker-0.5.2.tgz#d3850be7529c9580d815600b53126515e146dd39"
 
 esutils@^2.0.2:
   version "2.0.2"
@@ -1809,6 +1823,10 @@ lodash@^4.14.0, lodash@^4.17.4:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
 
+lodash@^4.17.10:
+  version "4.17.10"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+
 lodash@~3.10.1:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
@@ -1865,7 +1883,7 @@ meow@^3.1.0, meow@^3.3.0:
     redent "^1.0.0"
     trim-newlines "^1.0.0"
 
-micromatch@^2.1.5:
+micromatch@^2.1.5, micromatch@^2.3.11:
   version "2.3.11"
   resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-2.3.11.tgz#86677c97d1720b363431d04d0d15293bd38c1565"
   dependencies:
@@ -2420,21 +2438,19 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^2.0.0"
     inherits "^2.0.1"
 
-rollup-plugin-babel@^2.4.0:
-  version "2.7.1"
-  resolved "https://registry.yarnpkg.com/rollup-plugin-babel/-/rollup-plugin-babel-2.7.1.tgz#16528197b0f938a1536f44683c7a93d573182f57"
+rollup-plugin-babel@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-babel/-/rollup-plugin-babel-4.0.2.tgz#c073eeb0cc246324e6f6feaedbb90093841a138c"
   dependencies:
-    babel-core "6"
-    babel-plugin-transform-es2015-classes "^6.9.0"
-    object-assign "^4.1.0"
-    rollup-pluginutils "^1.5.0"
+    "@babel/helper-module-imports" "^7.0.0"
+    rollup-pluginutils "^2.3.0"
 
-rollup-pluginutils@^1.5.0:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-1.5.2.tgz#1e156e778f94b7255bfa1b3d0178be8f5c552408"
+rollup-pluginutils@^2.3.0:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-2.3.1.tgz#760d185ccc237dedc12d7ae48c6bcd127b4892d0"
   dependencies:
-    estree-walker "^0.2.1"
-    minimatch "^3.0.2"
+    estree-walker "^0.5.2"
+    micromatch "^2.3.11"
 
 rollup@0.51.3:
   version "0.51.3"
@@ -2672,6 +2688,10 @@ to-fast-properties@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"
 
+to-fast-properties@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-2.0.0.tgz#dc5e698cbd079265bc73e0377681a4e4e83f616e"
+
 tough-cookie@~2.3.0:
   version "2.3.3"
   resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.3.tgz#0b618a5565b6dea90bf3425d04d55edc475a7561"