diff --git a/package.json b/package.json
index fa361fdf..ca059b36 100644
--- a/package.json
+++ b/package.json
@@ -34,11 +34,11 @@
     "@aureooms/js-random": "^2.0.0"
   },
   "devDependencies": {
-    "@babel/cli": "7.10.5",
-    "@babel/core": "7.11.4",
-    "@babel/polyfill": "7.10.4",
-    "@babel/preset-env": "7.11.0",
-    "@babel/register": "7.10.5",
+    "@babel/cli": "7.11.5",
+    "@babel/core": "7.11.5",
+    "@babel/polyfill": "7.11.5",
+    "@babel/preset-env": "7.11.5",
+    "@babel/register": "7.11.5",
     "ava": "3.12.1",
     "coveralls": "3.1.0",
     "esdoc": "1.1.0",
diff --git a/yarn.lock b/yarn.lock
index 99cc08f4..5463f5b6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -36,10 +36,10 @@
   resolved "https://registry.yarnpkg.com/@aureooms/js-random/-/js-random-2.0.0.tgz#f62c6954ed79bd9a520197125ee3cfbe14b00d72"
   integrity sha1-9ixpVO15vZpSAZcSXuPPvhSwDXI=
 
-"@babel/cli@7.10.5":
-  version "7.10.5"
-  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.10.5.tgz#57df2987c8cf89d0fc7d4b157ec59d7619f1b77a"
-  integrity sha512-j9H9qSf3kLdM0Ao3aGPbGZ73mEA9XazuupcS6cDGWuiyAcANoguhP0r2Lx32H5JGw4sSSoHG3x/mxVnHgvOoyA==
+"@babel/cli@7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.11.5.tgz#4f51663f393d950b41f4c7ba41f3f7c2a595a295"
+  integrity sha512-0umMDxxdEZ98EMZtS9Wgnaf4NdgqBcQHaGYaMfAmP+ZicVglZ2+QZwoHNacfnUq4hCmC1V7Ap5Phq7FInpWrWg==
   dependencies:
     commander "^4.0.1"
     convert-source-map "^1.1.0"
@@ -48,7 +48,7 @@
     lodash "^4.17.19"
     make-dir "^2.1.0"
     slash "^2.0.0"
-    source-map "^0.5.0"
+    source-map "^0.6.1"
   optionalDependencies:
     chokidar "^2.1.8"
 
@@ -84,19 +84,19 @@
     invariant "^2.2.4"
     semver "^5.5.0"
 
-"@babel/core@7.11.4":
-  version "7.11.4"
-  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.11.4.tgz#4301dfdfafa01eeb97f1896c5501a3f0655d4229"
-  integrity sha512-5deljj5HlqRXN+5oJTY7Zs37iH3z3b++KjiKtIsJy1NrjOOVSEaJHEetLBhyu0aQOSNNZ/0IuEAan9GzRuDXHg==
+"@babel/core@7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.11.5.tgz#6ad96e2f71899ea3f9b651f0a911e85205d1ff6d"
+  integrity sha512-fsEANVOcZHzrsV6dMVWqpSeXClq3lNbYrfFGme6DE25FQWe7pyeYpXyx9guqUnpy466JLzZ8z4uwSr2iv60V5Q==
   dependencies:
     "@babel/code-frame" "^7.10.4"
-    "@babel/generator" "^7.11.4"
+    "@babel/generator" "^7.11.5"
     "@babel/helper-module-transforms" "^7.11.0"
     "@babel/helpers" "^7.10.4"
-    "@babel/parser" "^7.11.4"
+    "@babel/parser" "^7.11.5"
     "@babel/template" "^7.10.4"
-    "@babel/traverse" "^7.11.0"
-    "@babel/types" "^7.11.0"
+    "@babel/traverse" "^7.11.5"
+    "@babel/types" "^7.11.5"
     convert-source-map "^1.7.0"
     debug "^4.1.0"
     gensync "^1.0.0-beta.1"
@@ -104,7 +104,7 @@
     lodash "^4.17.19"
     resolve "^1.3.2"
     semver "^5.4.1"
-    source-map "^0.5.0"
+    source-map "^0.6.1"
 
 "@babel/core@^7.7.5":
   version "7.9.0"
@@ -138,23 +138,14 @@
     lodash "^4.17.13"
     source-map "^0.5.0"
 
-"@babel/generator@^7.11.0":
-  version "7.11.0"
-  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.11.0.tgz#4b90c78d8c12825024568cbe83ee6c9af193585c"
-  integrity sha512-fEm3Uzw7Mc9Xi//qU20cBKatTfs2aOtKqmvy/Vm7RkJEGFQ4xc9myCfbXxqK//ZS8MR/ciOHw6meGASJuKmDfQ==
+"@babel/generator@^7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.11.5.tgz#a5582773425a468e4ba269d9a1f701fbca6a7a82"
+  integrity sha512-9UqHWJ4IwRTy4l0o8gq2ef8ws8UPzvtMkVKjTLAiRmza9p9V6Z+OfuNd9fB1j5Q67F+dVJtPC2sZXI8NM9br4g==
   dependencies:
-    "@babel/types" "^7.11.0"
+    "@babel/types" "^7.11.5"
     jsesc "^2.5.1"
-    source-map "^0.5.0"
-
-"@babel/generator@^7.11.4":
-  version "7.11.4"
-  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.11.4.tgz#1ec7eec00defba5d6f83e50e3ee72ae2fee482be"
-  integrity sha512-Rn26vueFx0eOoz7iifCN2UHT6rGtnkSGWSoDRIy8jZN3B91PzeSULbswfLoOWuTuAcNwpG/mxy+uCTDnZ9Mp1g==
-  dependencies:
-    "@babel/types" "^7.11.0"
-    jsesc "^2.5.1"
-    source-map "^0.5.0"
+    source-map "^0.6.1"
 
 "@babel/generator@^7.9.0", "@babel/generator@^7.9.5":
   version "7.9.5"
@@ -526,15 +517,10 @@
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.10.4.tgz#9eedf27e1998d87739fb5028a5120557c06a1a64"
   integrity sha512-8jHII4hf+YVDsskTF6WuMB3X4Eh+PsUkC2ljq22so5rHvH+T8BzyL94VOdyFLNR8tBSVXOTbNHOKpR4TfRxVtA==
 
-"@babel/parser@^7.11.0":
-  version "7.11.0"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.11.0.tgz#a9d7e11aead25d3b422d17b2c6502c8dddef6a5d"
-  integrity sha512-qvRvi4oI8xii8NllyEc4MDJjuZiNaRzyb7Y7lup1NqJV8TZHF4O27CcP+72WPn/k1zkgJ6WJfnIbk4jTsVAZHw==
-
-"@babel/parser@^7.11.4":
-  version "7.11.4"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.11.4.tgz#6fa1a118b8b0d80d0267b719213dc947e88cc0ca"
-  integrity sha512-MggwidiH+E9j5Sh8pbrX5sJvMcsqS5o+7iB42M9/k0CD63MjYbdP4nhSh7uB5wnv2/RVzTZFTxzF/kIa5mrCqA==
+"@babel/parser@^7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.11.5.tgz#c7ff6303df71080ec7a4f5b8c003c58f1cf51037"
+  integrity sha512-X9rD8qqm695vgmeaQ4fvz/o3+Wk4ZzQvSHkDBgpYKxpD4qTAUm88ZKtHkVqIOsYFFbIQ6wQYhC6q7pjqVK0E0Q==
 
 "@babel/parser@^7.7.5", "@babel/parser@^7.8.6", "@babel/parser@^7.9.0":
   version "7.9.4"
@@ -1000,18 +986,18 @@
     "@babel/helper-create-regexp-features-plugin" "^7.10.4"
     "@babel/helper-plugin-utils" "^7.10.4"
 
-"@babel/polyfill@7.10.4":
-  version "7.10.4"
-  resolved "https://registry.yarnpkg.com/@babel/polyfill/-/polyfill-7.10.4.tgz#915e5bfe61490ac0199008e35ca9d7d151a8e45a"
-  integrity sha512-8BYcnVqQ5kMD2HXoHInBH7H1b/uP3KdnwCYXOqFnXqguOyuu443WXusbIUbWEfY3Z0Txk0M1uG/8YuAMhNl6zg==
+"@babel/polyfill@7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/polyfill/-/polyfill-7.11.5.tgz#df550b2ec53abbc2ed599367ec59e64c7a707bb5"
+  integrity sha512-FunXnE0Sgpd61pKSj2OSOs1D44rKTD3pGOfGilZ6LGrrIH0QEtJlTjqOqdF8Bs98JmjfGhni2BBkTfv9KcKJ9g==
   dependencies:
     core-js "^2.6.5"
     regenerator-runtime "^0.13.4"
 
-"@babel/preset-env@7.11.0":
-  version "7.11.0"
-  resolved "https://registry.yarnpkg.com/@babel/preset-env/-/preset-env-7.11.0.tgz#860ee38f2ce17ad60480c2021ba9689393efb796"
-  integrity sha512-2u1/k7rG/gTh02dylX2kL3S0IJNF+J6bfDSp4DI2Ma8QN6Y9x9pmAax59fsCk6QUQG0yqH47yJWA+u1I1LccAg==
+"@babel/preset-env@7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/preset-env/-/preset-env-7.11.5.tgz#18cb4b9379e3e92ffea92c07471a99a2914e4272"
+  integrity sha512-kXqmW1jVcnB2cdueV+fyBM8estd5mlNfaQi6lwLgRwCby4edpavgbFhiBNjmWA3JpB/yZGSISa7Srf+TwxDQoA==
   dependencies:
     "@babel/compat-data" "^7.11.0"
     "@babel/helper-compilation-targets" "^7.10.4"
@@ -1075,7 +1061,7 @@
     "@babel/plugin-transform-unicode-escapes" "^7.10.4"
     "@babel/plugin-transform-unicode-regex" "^7.10.4"
     "@babel/preset-modules" "^0.1.3"
-    "@babel/types" "^7.11.0"
+    "@babel/types" "^7.11.5"
     browserslist "^4.12.0"
     core-js-compat "^3.6.2"
     invariant "^2.2.2"
@@ -1093,10 +1079,10 @@
     "@babel/types" "^7.4.4"
     esutils "^2.0.2"
 
-"@babel/register@7.10.5":
-  version "7.10.5"
-  resolved "https://registry.yarnpkg.com/@babel/register/-/register-7.10.5.tgz#354f3574895f1307f79efe37a51525e52fd38d89"
-  integrity sha512-eYHdLv43nyvmPn9bfNfrcC4+iYNwdQ8Pxk1MFJuU/U5LpSYl/PH4dFMazCYZDFVi8ueG3shvO+AQfLrxpYulQw==
+"@babel/register@7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/register/-/register-7.11.5.tgz#79becf89e0ddd0fba8b92bc279bc0f5d2d7ce2ea"
+  integrity sha512-CAml0ioKX+kOAvBQDHa/+t1fgOt3qkTIz0TrRtRAT6XY0m5qYZXR85k6/sLCNPMGhYDlCFHCYuU0ybTJbvlC6w==
   dependencies:
     find-cache-dir "^2.0.0"
     lodash "^4.17.19"
@@ -1144,17 +1130,17 @@
     globals "^11.1.0"
     lodash "^4.17.13"
 
-"@babel/traverse@^7.11.0":
-  version "7.11.0"
-  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.11.0.tgz#9b996ce1b98f53f7c3e4175115605d56ed07dd24"
-  integrity sha512-ZB2V+LskoWKNpMq6E5UUCrjtDUh5IOTAyIl0dTjIEoXum/iKWkoIEKIRDnUucO6f+2FzNkE0oD4RLKoPIufDtg==
+"@babel/traverse@^7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.11.5.tgz#be777b93b518eb6d76ee2e1ea1d143daa11e61c3"
+  integrity sha512-EjiPXt+r7LiCZXEfRpSJd+jUMnBd4/9OUv7Nx3+0u9+eimMwJmG0Q98lw4/289JCoxSE8OolDMNZaaF/JZ69WQ==
   dependencies:
     "@babel/code-frame" "^7.10.4"
-    "@babel/generator" "^7.11.0"
+    "@babel/generator" "^7.11.5"
     "@babel/helper-function-name" "^7.10.4"
     "@babel/helper-split-export-declaration" "^7.11.0"
-    "@babel/parser" "^7.11.0"
-    "@babel/types" "^7.11.0"
+    "@babel/parser" "^7.11.5"
+    "@babel/types" "^7.11.5"
     debug "^4.1.0"
     globals "^11.1.0"
     lodash "^4.17.19"
@@ -1192,6 +1178,15 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
+"@babel/types@^7.11.5":
+  version "7.11.5"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.11.5.tgz#d9de577d01252d77c6800cee039ee64faf75662d"
+  integrity sha512-bvM7Qz6eKnJVFIn+1LPtjlBFPVN5jNDc1XmN15vWe7Q3DPBufWWsLiIvUu7xW87uTG6QoggpIDnUgLQvPheU+Q==
+  dependencies:
+    "@babel/helper-validator-identifier" "^7.10.4"
+    lodash "^4.17.19"
+    to-fast-properties "^2.0.0"
+
 "@babel/types@^7.4.4", "@babel/types@^7.8.3", "@babel/types@^7.8.6", "@babel/types@^7.9.0", "@babel/types@^7.9.5":
   version "7.9.5"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.9.5.tgz#89231f82915a8a566a703b3b20133f73da6b9444"