diff --git a/example/yarn.lock b/example/yarn.lock
index c8a8865..ac87547 100644
--- a/example/yarn.lock
+++ b/example/yarn.lock
@@ -2380,13 +2380,6 @@ big.js@^5.2.2:
   resolved "https://registry.yarnpkg.com/big.js/-/big.js-5.2.2.tgz#65f0af382f578bcdc742bd9c281e9cb2d7768328"
   integrity sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==
 
-bigint-buffer@^1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/bigint-buffer/-/bigint-buffer-1.1.2.tgz#b7edfaf3a88d0767aed7edc671d6bae4b1021575"
-  integrity sha512-gof9NgbodUgCXD2aUHfUKk5KUDk6/zPlwE+YYpRM2t7zS0K/6WipJFWfziIY+EavxFDuGUnuuQQzzvNcckPKNA==
-  dependencies:
-    bindings "^1.3.0"
-
 bignumber.js@^9.0.0:
   version "9.0.0"
   resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-9.0.0.tgz#805880f84a329b5eac6e7cb6f8274b6d82bdf075"
@@ -2397,13 +2390,6 @@ binary-extensions@^1.0.0:
   resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.13.0.tgz#9523e001306a32444b907423f1de2164222f6ab1"
   integrity sha512-EgmjVLMn22z7eGGv3kcnHwSnJXmFHjISTY9E/S5lIcTD3Oxw05QTcBLNkJFzcb3cNueUdF/IN4U+d78V0zO8Hw==
 
-bindings@^1.3.0:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.5.0.tgz#10353c9e945334bc0511a6d90b38fbc7c9c504df"
-  integrity sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==
-  dependencies:
-    file-uri-to-path "1.0.0"
-
 bip39@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/bip39/-/bip39-3.0.2.tgz#2baf42ff3071fc9ddd5103de92e8f80d9257ee32"
@@ -4389,11 +4375,6 @@ file-loader@3.0.1:
     loader-utils "^1.0.2"
     schema-utils "^1.0.0"
 
-file-uri-to-path@1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz#553a7b8446ff6f684359c445f1e37a05dacc33dd"
-  integrity sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==
-
 filesize@3.6.1:
   version "3.6.1"
   resolved "https://registry.yarnpkg.com/filesize/-/filesize-3.6.1.tgz#090bb3ee01b6f801a8a8be99d31710b3422bb317"
@@ -6300,10 +6281,9 @@ levn@^0.3.0, levn@~0.3.0:
     type-check "~0.3.2"
 
 "libra-web@file:..":
-  version "0.1.0"
+  version "0.1.2"
   dependencies:
     axios "^0.19.0"
-    bigint-buffer "^1.1.2"
     bignumber.js "^9.0.0"
     bip39 "^3.0.2"
     elliptic "^6.4.1"
@@ -8147,19 +8127,10 @@ postcss-values-parser@^2.0.0:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.2, postcss@^7.0.5, postcss@^7.0.6:
-  version "7.0.14"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.14.tgz#4527ed6b1ca0d82c53ce5ec1a2041c2346bbd6e5"
-  integrity sha512-NsbD6XUUMZvBxtQAJuWDJeeC4QFsmWsfozWxCJPWf3M55K9iu2iMDaKqyoOdTJ1R4usBXuxlVFAIo8rZPQD4Bg==
-  dependencies:
-    chalk "^2.4.2"
-    source-map "^0.6.1"
-    supports-color "^6.1.0"
-
-postcss@^7.0.16:
-  version "7.0.17"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.17.tgz#4da1bdff5322d4a0acaab4d87f3e782436bad31f"
-  integrity sha512-546ZowA+KZ3OasvQZHsbuEpysvwTZNGJv9EfyCQdsIDltPSWHAeTQ5fQy/Npi2ZDtLI3zs7Ps/p6wThErhm9fQ==
+postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.16, postcss@^7.0.2, postcss@^7.0.5, postcss@^7.0.6:
+  version "7.0.36"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.36.tgz#056f8cffa939662a8f5905950c07d5285644dfcb"
+  integrity sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==
   dependencies:
     chalk "^2.4.2"
     source-map "^0.6.1"