diff --git a/package.json b/package.json
index 8189b4c..ad3b5a4 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   "author": "AtaruOhto",
   "license": "MIT",
   "dependencies": {
-    "bcrypt": "^3.0.0",
+    "bcrypt": "^5.0.0",
     "express": "^4.16.3",
     "helmet": "^3.23.3",
     "jsonwebtoken": "^8.5.1",
diff --git a/yarn.lock b/yarn.lock
index 918142e..537c14d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -323,12 +323,12 @@ base@^0.11.1:
     mixin-deep "^1.2.0"
     pascalcase "^0.1.1"
 
-bcrypt@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/bcrypt/-/bcrypt-3.0.0.tgz#0cd38983f45143aa5a6122c9660d0b7ec3a33fb0"
+bcrypt@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/bcrypt/-/bcrypt-5.0.0.tgz#051407c7cd5ffbfb773d541ca3760ea0754e37e2"
   dependencies:
-    nan "2.10.0"
-    node-pre-gyp "0.10.2"
+    node-addon-api "^3.0.0"
+    node-pre-gyp "0.15.0"
 
 binary-extensions@^1.0.0:
   version "1.11.0"
@@ -489,6 +489,10 @@ chownr@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.0.1.tgz#e2a75042a9551908bebd25b8523d5f9769d79181"
 
+chownr@^1.1.1:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.1.4.tgz#6fc9d7b42d32a583596337666e7d08084da2cc6b"
+
 ci-info@^1.3.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-1.4.0.tgz#4841d53cad49f11b827b648ebde27a6e189b412f"
@@ -702,6 +706,12 @@ debug@3.1.0, debug@^3.1.0:
   dependencies:
     ms "2.0.0"
 
+debug@^3.2.6:
+  version "3.2.6"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
+  dependencies:
+    ms "^2.1.1"
+
 debug@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
@@ -1923,6 +1933,10 @@ minimist@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
+minimist@^1.2.5:
+  version "1.2.5"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
+
 minipass@^2.2.1, minipass@^2.3.3:
   version "2.3.4"
   resolved "https://registry.yarnpkg.com/minipass/-/minipass-2.3.4.tgz#4768d7605ed6194d6d576169b9e12ef71e9d9957"
@@ -1930,12 +1944,25 @@ minipass@^2.2.1, minipass@^2.3.3:
     safe-buffer "^5.1.2"
     yallist "^3.0.0"
 
+minipass@^2.8.6, minipass@^2.9.0:
+  version "2.9.0"
+  resolved "https://registry.yarnpkg.com/minipass/-/minipass-2.9.0.tgz#e713762e7d3e32fed803115cf93e04bca9fcc9a6"
+  dependencies:
+    safe-buffer "^5.1.2"
+    yallist "^3.0.0"
+
 minizlib@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/minizlib/-/minizlib-1.1.0.tgz#11e13658ce46bc3a70a267aac58359d1e0c29ceb"
   dependencies:
     minipass "^2.2.1"
 
+minizlib@^1.2.1:
+  version "1.3.3"
+  resolved "https://registry.yarnpkg.com/minizlib/-/minizlib-1.3.3.tgz#2290de96818a34c29551c8a8d301216bd65a861d"
+  dependencies:
+    minipass "^2.9.0"
+
 mixin-deep@^1.2.0:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.2.tgz#1120b43dc359a785dce65b55b82e257ccf479566"
@@ -1949,6 +1976,12 @@ mkdirp@0.5.1, mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0:
   dependencies:
     minimist "0.0.8"
 
+mkdirp@^0.5.3:
+  version "0.5.5"
+  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.5.tgz#d91cefd62d1436ca0f41620e251288d420099def"
+  dependencies:
+    minimist "^1.2.5"
+
 mocha@^5.2.0:
   version "5.2.0"
   resolved "https://registry.yarnpkg.com/mocha/-/mocha-5.2.0.tgz#6d8ae508f59167f940f2b5b3c4a612ae50c90ae6"
@@ -2004,7 +2037,7 @@ named-placeholders@1.1.1:
   dependencies:
     lru-cache "2.5.0"
 
-nan@2.10.0, nan@^2.9.2:
+nan@^2.9.2:
   version "2.10.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
 
@@ -2024,7 +2057,7 @@ nanomatch@^1.2.9:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
-needle@^2.2.0, needle@^2.2.1:
+needle@^2.2.1:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/needle/-/needle-2.2.2.tgz#1120ca4c41f2fcc6976fd28a8968afe239929418"
   dependencies:
@@ -2032,6 +2065,14 @@ needle@^2.2.0, needle@^2.2.1:
     iconv-lite "^0.4.4"
     sax "^1.2.4"
 
+needle@^2.5.0:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/needle/-/needle-2.5.0.tgz#e6fc4b3cc6c25caed7554bd613a5cf0bac8c31c0"
+  dependencies:
+    debug "^3.2.6"
+    iconv-lite "^0.4.4"
+    sax "^1.2.4"
+
 negotiator@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
@@ -2044,20 +2085,24 @@ nocache@2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/nocache/-/nocache-2.1.0.tgz#120c9ffec43b5729b1d5de88cd71aa75a0ba491f"
 
-node-pre-gyp@0.10.2:
-  version "0.10.2"
-  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.10.2.tgz#e8945c20ef6795a20aac2b44f036eb13cf5146e3"
+node-addon-api@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/node-addon-api/-/node-addon-api-3.0.0.tgz#812446a1001a54f71663bed188314bba07e09247"
+
+node-pre-gyp@0.15.0:
+  version "0.15.0"
+  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.15.0.tgz#c2fc383276b74c7ffa842925241553e8b40f1087"
   dependencies:
     detect-libc "^1.0.2"
-    mkdirp "^0.5.1"
-    needle "^2.2.0"
+    mkdirp "^0.5.3"
+    needle "^2.5.0"
     nopt "^4.0.1"
     npm-packlist "^1.1.6"
     npmlog "^4.0.2"
     rc "^1.2.7"
     rimraf "^2.6.1"
     semver "^5.3.0"
-    tar "^4"
+    tar "^4.4.2"
 
 node-pre-gyp@^0.10.0:
   version "0.10.3"
@@ -3004,6 +3049,18 @@ tar@^4:
     safe-buffer "^5.1.2"
     yallist "^3.0.2"
 
+tar@^4.4.2:
+  version "4.4.13"
+  resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.13.tgz#43b364bc52888d555298637b10d60790254ab525"
+  dependencies:
+    chownr "^1.1.1"
+    fs-minipass "^1.2.5"
+    minipass "^2.8.6"
+    minizlib "^1.2.1"
+    mkdirp "^0.5.0"
+    safe-buffer "^5.1.2"
+    yallist "^3.0.3"
+
 term-size@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/term-size/-/term-size-1.2.0.tgz#458b83887f288fc56d6fffbfad262e26638efa69"
@@ -3398,6 +3455,10 @@ yallist@^3.0.0, yallist@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.2.tgz#8452b4bb7e83c7c188d8041c1a837c773d6d8bb9"
 
+yallist@^3.0.3:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
+
 yargs-parser@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-7.0.0.tgz#8d0ac42f16ea55debd332caf4c4038b3e3f5dfd9"