diff --git a/package-lock.json b/package-lock.json
index 47e7e2a..e8ed037 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,7 @@
       "version": "1.4.0",
       "license": "MIT",
       "dependencies": {
-        "async": "3.2.0",
+        "async": "3.2.2",
         "bunyan": "1.8.15",
         "encoding-down": "7.0.0",
         "leveldown": "6.0.0",
@@ -128,9 +128,9 @@
       }
     },
     "node_modules/async": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
-      "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.2.tgz",
+      "integrity": "sha512-H0E+qZaDEfx/FY4t7iLRv1W2fFI6+pyCeTw1uN20AQPiwqwM6ojPxHxdLv4z8hi2DtnW9BOckSspLucW7pIE5g=="
     },
     "node_modules/balanced-match": {
       "version": "1.0.2",
@@ -1083,13 +1083,13 @@
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
       "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
-      "devOptional": true
+      "optional": true
     },
     "node_modules/mkdirp": {
       "version": "0.5.5",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
       "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
-      "devOptional": true,
+      "optional": true,
       "dependencies": {
         "minimist": "^1.2.5"
       },
@@ -8929,7 +8929,7 @@
       "version": "2.4.5",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.4.5.tgz",
       "integrity": "sha1-7nEM5dk6j9uFb7Xqj/Di11k0sto=",
-      "devOptional": true,
+      "optional": true,
       "dependencies": {
         "glob": "^6.0.1"
       },
@@ -8941,7 +8941,7 @@
       "version": "6.0.4",
       "resolved": "https://registry.npmjs.org/glob/-/glob-6.0.4.tgz",
       "integrity": "sha1-DwiGD2oVUSey+t1PnOJLGqtuTSI=",
-      "devOptional": true,
+      "optional": true,
       "dependencies": {
         "inflight": "^1.0.4",
         "inherits": "2",
@@ -9463,9 +9463,9 @@
       "dev": true
     },
     "async": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
-      "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.2.tgz",
+      "integrity": "sha512-H0E+qZaDEfx/FY4t7iLRv1W2fFI6+pyCeTw1uN20AQPiwqwM6ojPxHxdLv4z8hi2DtnW9BOckSspLucW7pIE5g=="
     },
     "balanced-match": {
       "version": "1.0.2",
@@ -10148,13 +10148,13 @@
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
       "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
-      "devOptional": true
+      "optional": true
     },
     "mkdirp": {
       "version": "0.5.5",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
       "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
-      "devOptional": true,
+      "optional": true,
       "requires": {
         "minimist": "^1.2.5"
       }
@@ -16835,7 +16835,7 @@
       "version": "2.4.5",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.4.5.tgz",
       "integrity": "sha1-7nEM5dk6j9uFb7Xqj/Di11k0sto=",
-      "devOptional": true,
+      "optional": true,
       "requires": {
         "glob": "^6.0.1"
       },
@@ -16844,7 +16844,7 @@
           "version": "6.0.4",
           "resolved": "https://registry.npmjs.org/glob/-/glob-6.0.4.tgz",
           "integrity": "sha1-DwiGD2oVUSey+t1PnOJLGqtuTSI=",
-          "devOptional": true,
+          "optional": true,
           "requires": {
             "inflight": "^1.0.4",
             "inherits": "2",
diff --git a/package.json b/package.json
index 34be7df..4587074 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "simple-mock": "0.8.0"
   },
   "dependencies": {
-    "async": "3.2.0",
+    "async": "3.2.2",
     "bunyan": "1.8.15",
     "encoding-down": "7.0.0",
     "leveldown": "6.0.0",