diff --git a/package.json b/package.json
index 125a5dd..edf056a 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
         "test": "jest"
     },
     "dependencies": {
-        "ioredis": "^3.1.4"
+        "ioredis": "^4.27.6"
     },
     "devDependencies": {
         "eslint": "^4.4.1",
diff --git a/yarn.lock b/yarn.lock
index 0ea74f7..0537f39 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -361,10 +361,6 @@ bcrypt-pbkdf@^1.0.0:
   dependencies:
     tweetnacl "^0.14.3"
 
-bluebird@^3.3.4:
-  version "3.4.6"
-  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.4.6.tgz#01da8d821d87813d158967e743d5fe6c62cf8c0f"
-
 boom@2.x.x:
   version "2.10.1"
   resolved "https://registry.yarnpkg.com/boom/-/boom-2.10.1.tgz#39c8918ceff5799f83f9492a848f625add0c766f"
@@ -500,9 +496,9 @@ cliui@^3.2.0:
     strip-ansi "^3.0.1"
     wrap-ansi "^2.0.0"
 
-cluster-key-slot@^1.0.6:
-  version "1.0.8"
-  resolved "https://registry.yarnpkg.com/cluster-key-slot/-/cluster-key-slot-1.0.8.tgz#7654556085a65330932a2e8b5976f8e2d0b3e414"
+cluster-key-slot@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/cluster-key-slot/-/cluster-key-slot-1.1.0.tgz#30474b2a981fb12172695833052bc0d01336d10d"
 
 co@^4.6.0:
   version "4.6.0"
@@ -594,18 +590,18 @@ dashdash@^1.12.0:
   dependencies:
     assert-plus "^1.0.0"
 
-debug@^2.2.0:
-  version "2.3.3"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.3.3.tgz#40c453e67e6e13c901ddec317af8986cda9eff8c"
-  dependencies:
-    ms "0.7.2"
-
 debug@^2.6.3, debug@^2.6.8:
   version "2.6.8"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.8.tgz#e731531ca2ede27d188222427da17821d68ff4fc"
   dependencies:
     ms "2.0.0"
 
+debug@^4.3.1:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.1.tgz#f0d229c505e0c6d8c49ac553d1b13dc183f6b2ee"
+  dependencies:
+    ms "2.1.2"
+
 decamelize@^1.0.0, decamelize@^1.1.1:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
@@ -999,10 +995,6 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flexbuffer@0.0.6:
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/flexbuffer/-/flexbuffer-0.0.6.tgz#039fdf23f8823e440c38f3277e6fef1174215b30"
-
 for-in@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
@@ -1244,33 +1236,20 @@ invert-kv@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/invert-kv/-/invert-kv-1.0.0.tgz#104a8e4aaca6d3d8cd157a8ef8bfab2d7a3ffdb6"
 
-ioredis@^3.1.4:
-  version "3.1.4"
-  resolved "https://registry.yarnpkg.com/ioredis/-/ioredis-3.1.4.tgz#8688293f5f2f1757e1c812ad17cce49f46d811bc"
+ioredis@^4.27.6:
+  version "4.27.6"
+  resolved "https://registry.yarnpkg.com/ioredis/-/ioredis-4.27.6.tgz#a53d427d3fe75fbd10ed7ad150ce00559df8dcf8"
   dependencies:
-    bluebird "^3.3.4"
-    cluster-key-slot "^1.0.6"
-    debug "^2.2.0"
+    cluster-key-slot "^1.1.0"
+    debug "^4.3.1"
     denque "^1.1.0"
-    flexbuffer "0.0.6"
-    lodash.assign "^4.2.0"
-    lodash.bind "^4.2.1"
-    lodash.clone "^4.5.0"
-    lodash.clonedeep "^4.5.0"
     lodash.defaults "^4.2.0"
-    lodash.difference "^4.5.0"
     lodash.flatten "^4.4.0"
-    lodash.foreach "^4.5.0"
-    lodash.isempty "^4.4.0"
-    lodash.keys "^4.2.0"
-    lodash.noop "^3.0.1"
-    lodash.partial "^4.2.1"
-    lodash.pick "^4.4.0"
-    lodash.sample "^4.2.1"
-    lodash.shuffle "^4.2.0"
-    lodash.values "^4.3.0"
-    redis-commands "^1.2.0"
-    redis-parser "^2.4.0"
+    p-map "^2.1.0"
+    redis-commands "1.7.0"
+    redis-errors "^1.2.0"
+    redis-parser "^3.0.0"
+    standard-as-callback "^2.1.0"
 
 is-arrayish@^0.2.1:
   version "0.2.1"
@@ -1847,22 +1826,6 @@ locate-path@^2.0.0:
     p-locate "^2.0.0"
     path-exists "^3.0.0"
 
-lodash.assign@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.assign/-/lodash.assign-4.2.0.tgz#0d99f3ccd7a6d261d19bdaeb9245005d285808e7"
-
-lodash.bind@^4.2.1:
-  version "4.2.1"
-  resolved "https://registry.yarnpkg.com/lodash.bind/-/lodash.bind-4.2.1.tgz#7ae3017e939622ac31b7d7d7dcb1b34db1690d35"
-
-lodash.clone@^4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/lodash.clone/-/lodash.clone-4.5.0.tgz#195870450f5a13192478df4bc3d23d2dea1907b6"
-
-lodash.clonedeep@^4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
-
 lodash.cond@^4.3.0:
   version "4.5.2"
   resolved "https://registry.yarnpkg.com/lodash.cond/-/lodash.cond-4.5.2.tgz#f471a1da486be60f6ab955d17115523dd1d255d5"
@@ -1871,50 +1834,10 @@ lodash.defaults@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/lodash.defaults/-/lodash.defaults-4.2.0.tgz#d09178716ffea4dde9e5fb7b37f6f0802274580c"
 
-lodash.difference@^4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/lodash.difference/-/lodash.difference-4.5.0.tgz#9ccb4e505d486b91651345772885a2df27fd017c"
-
 lodash.flatten@^4.4.0:
   version "4.4.0"
   resolved "https://registry.yarnpkg.com/lodash.flatten/-/lodash.flatten-4.4.0.tgz#f31c22225a9632d2bbf8e4addbef240aa765a61f"
 
-lodash.foreach@^4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/lodash.foreach/-/lodash.foreach-4.5.0.tgz#1a6a35eace401280c7f06dddec35165ab27e3e53"
-
-lodash.isempty@^4.4.0:
-  version "4.4.0"
-  resolved "https://registry.yarnpkg.com/lodash.isempty/-/lodash.isempty-4.4.0.tgz#6f86cbedd8be4ec987be9aaf33c9684db1b31e7e"
-
-lodash.keys@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.keys/-/lodash.keys-4.2.0.tgz#a08602ac12e4fb83f91fc1fb7a360a4d9ba35205"
-
-lodash.noop@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/lodash.noop/-/lodash.noop-3.0.1.tgz#38188f4d650a3a474258439b96ec45b32617133c"
-
-lodash.partial@^4.2.1:
-  version "4.2.1"
-  resolved "https://registry.yarnpkg.com/lodash.partial/-/lodash.partial-4.2.1.tgz#49f3d8cfdaa3bff8b3a91d127e923245418961d4"
-
-lodash.pick@^4.4.0:
-  version "4.4.0"
-  resolved "https://registry.yarnpkg.com/lodash.pick/-/lodash.pick-4.4.0.tgz#52f05610fff9ded422611441ed1fc123a03001b3"
-
-lodash.sample@^4.2.1:
-  version "4.2.1"
-  resolved "https://registry.yarnpkg.com/lodash.sample/-/lodash.sample-4.2.1.tgz#5e4291b0c753fa1abeb0aab8fb29df1b66f07f6d"
-
-lodash.shuffle@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.shuffle/-/lodash.shuffle-4.2.0.tgz#145b5053cf875f6f5c2a33f48b6e9948c6ec7b4b"
-
-lodash.values@^4.3.0:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/lodash.values/-/lodash.values-4.3.0.tgz#a3a6c2b0ebecc5c2cba1c17e6e620fe81b53d347"
-
 lodash@^4.0.0, lodash@^4.3.0:
   version "4.17.2"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.2.tgz#34a3055babe04ce42467b607d700072c7ff6bf42"
@@ -2012,14 +1935,14 @@ mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
-ms@0.7.2:
-  version "0.7.2"
-  resolved "https://registry.yarnpkg.com/ms/-/ms-0.7.2.tgz#ae25cf2512b3885a1d95d7f037868d8431124765"
-
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
 
+ms@2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
+
 mute-stream@0.0.7:
   version "0.0.7"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
@@ -2141,6 +2064,10 @@ p-map@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/p-map/-/p-map-1.1.1.tgz#05f5e4ae97a068371bc2a5cc86bfbdbc19c4ae7a"
 
+p-map@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/p-map/-/p-map-2.1.0.tgz#310928feef9c9ecc65b68b17693018a665cea175"
+
 parse-glob@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/parse-glob/-/parse-glob-3.0.4.tgz#b2c376cfb11f35513badd173ef0bb6e3a388391c"
@@ -2316,13 +2243,19 @@ readable-stream@^2.2.2:
     string_decoder "~1.0.3"
     util-deprecate "~1.0.1"
 
-redis-commands@^1.2.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/redis-commands/-/redis-commands-1.3.0.tgz#4307d8094aee1315829ab6729b37b99f62365d63"
+redis-commands@1.7.0:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/redis-commands/-/redis-commands-1.7.0.tgz#15a6fea2d58281e27b1cd1acfb4b293e278c3a89"
 
-redis-parser@^2.4.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/redis-parser/-/redis-parser-2.6.0.tgz#52ed09dacac108f1a631c07e9b69941e7a19504b"
+redis-errors@^1.0.0, redis-errors@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/redis-errors/-/redis-errors-1.2.0.tgz#eb62d2adb15e4eaf4610c04afe1529384250abad"
+
+redis-parser@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/redis-parser/-/redis-parser-3.0.0.tgz#b66d828cdcafe6b4b8a428a7def4c6bcac31c8b4"
+  dependencies:
+    redis-errors "^1.0.0"
 
 regenerator-runtime@^0.11.0:
   version "0.11.0"
@@ -2564,6 +2497,10 @@ sshpk@^1.7.0:
     jsbn "~0.1.0"
     tweetnacl "~0.14.0"
 
+standard-as-callback@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/standard-as-callback/-/standard-as-callback-2.1.0.tgz#8953fc05359868a77b5b9739a665c5977bb7df45"
+
 string-length@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/string-length/-/string-length-1.0.1.tgz#56970fb1c38558e9e70b728bf3de269ac45adfac"