diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index 57e989f..98d6043 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -258,9 +258,9 @@
           "resolved": "https://registry.npmjs.org/dtrace-provider/-/dtrace-provider-0.6.0.tgz",
           "dependencies": {
             "nan": {
-              "version": "2.4.0",
+              "version": "2.5.0",
               "from": "nan@>=2.0.8 <3.0.0",
-              "resolved": "https://registry.npmjs.org/nan/-/nan-2.4.0.tgz"
+              "resolved": "https://registry.npmjs.org/nan/-/nan-2.5.0.tgz"
             }
           }
         },
@@ -854,7 +854,7 @@
             },
             "inherits": {
               "version": "2.0.3",
-              "from": "inherits@>=2.0.1 <2.1.0",
+              "from": "inherits@>=2.0.0 <3.0.0",
               "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz"
             },
             "once": {
@@ -1036,7 +1036,7 @@
         },
         "minimatch": {
           "version": "3.0.3",
-          "from": "minimatch@>=3.0.0 <3.1.0",
+          "from": "minimatch@>=3.0.0 <4.0.0",
           "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.3.tgz",
           "dependencies": {
             "brace-expansion": {
@@ -1257,25 +1257,30 @@
           "resolved": "https://registry.npmjs.org/eslint/-/eslint-2.13.1.tgz",
           "dependencies": {
             "concat-stream": {
-              "version": "1.5.2",
+              "version": "1.6.0",
               "from": "concat-stream@>=1.4.6 <2.0.0",
-              "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.5.2.tgz",
+              "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.0.tgz",
               "dependencies": {
                 "inherits": {
                   "version": "2.0.3",
-                  "from": "inherits@>=2.0.1 <2.1.0",
+                  "from": "inherits@>=2.0.3 <3.0.0",
                   "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz"
                 },
                 "typedarray": {
                   "version": "0.0.6",
-                  "from": "typedarray@>=0.0.5 <0.1.0",
+                  "from": "typedarray@>=0.0.6 <0.0.7",
                   "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz"
                 },
                 "readable-stream": {
-                  "version": "2.0.6",
-                  "from": "readable-stream@>=2.0.0 <2.1.0",
-                  "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.0.6.tgz",
+                  "version": "2.2.2",
+                  "from": "readable-stream@>=2.2.2 <3.0.0",
+                  "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.2.2.tgz",
                   "dependencies": {
+                    "buffer-shims": {
+                      "version": "1.0.0",
+                      "from": "buffer-shims@>=1.0.0 <2.0.0",
+                      "resolved": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz"
+                    },
                     "core-util-is": {
                       "version": "1.0.2",
                       "from": "core-util-is@>=1.0.0 <1.1.0",
@@ -1306,9 +1311,9 @@
               }
             },
             "debug": {
-              "version": "2.3.3",
+              "version": "2.6.0",
               "from": "debug@>=2.1.1 <3.0.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-2.3.3.tgz",
+              "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.0.tgz",
               "dependencies": {
                 "ms": {
                   "version": "0.7.2",
@@ -1423,9 +1428,9 @@
               "resolved": "https://registry.npmjs.org/espree/-/espree-3.3.2.tgz",
               "dependencies": {
                 "acorn": {
-                  "version": "4.0.3",
+                  "version": "4.0.4",
                   "from": "acorn@>=4.0.1 <5.0.0",
-                  "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.3.tgz"
+                  "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.4.tgz"
                 },
                 "acorn-jsx": {
                   "version": "3.0.1",
@@ -1457,13 +1462,13 @@
               "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-1.3.1.tgz",
               "dependencies": {
                 "flat-cache": {
-                  "version": "1.2.1",
+                  "version": "1.2.2",
                   "from": "flat-cache@>=1.2.1 <2.0.0",
-                  "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-1.2.1.tgz",
+                  "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-1.2.2.tgz",
                   "dependencies": {
                     "circular-json": {
                       "version": "0.3.1",
-                      "from": "circular-json@>=0.3.0 <0.4.0",
+                      "from": "circular-json@>=0.3.1 <0.4.0",
                       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.1.tgz"
                     },
                     "del": {
@@ -1808,9 +1813,9 @@
                   }
                 },
                 "jsonpointer": {
-                  "version": "4.0.0",
+                  "version": "4.0.1",
                   "from": "jsonpointer@>=4.0.0 <5.0.0",
-                  "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.0.tgz"
+                  "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.1.tgz"
                 },
                 "xtend": {
                   "version": "4.0.1",
@@ -1885,9 +1890,9 @@
               }
             },
             "lodash": {
-              "version": "4.17.2",
+              "version": "4.17.4",
               "from": "lodash@>=4.0.0 <5.0.0",
-              "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.2.tgz"
+              "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz"
             },
             "mkdirp": {
               "version": "0.5.1",
@@ -1927,9 +1932,9 @@
                   "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz"
                 },
                 "fast-levenshtein": {
-                  "version": "2.0.5",
+                  "version": "2.0.6",
                   "from": "fast-levenshtein@>=2.0.4 <2.1.0",
-                  "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.5.tgz"
+                  "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz"
                 }
               }
             },
@@ -1993,9 +1998,9 @@
               "resolved": "https://registry.npmjs.org/table/-/table-3.8.3.tgz",
               "dependencies": {
                 "ajv": {
-                  "version": "4.9.2",
+                  "version": "4.10.4",
                   "from": "ajv@>=4.7.0 <5.0.0",
-                  "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.9.2.tgz",
+                  "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.10.4.tgz",
                   "dependencies": {
                     "co": {
                       "version": "4.6.0",
@@ -2005,9 +2010,9 @@
                   }
                 },
                 "ajv-keywords": {
-                  "version": "1.2.0",
+                  "version": "1.5.0",
                   "from": "ajv-keywords@>=1.0.0 <2.0.0",
-                  "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.2.0.tgz"
+                  "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.0.tgz"
                 },
                 "slice-ansi": {
                   "version": "0.0.4",
@@ -2476,9 +2481,9 @@
                       }
                     },
                     "jsonpointer": {
-                      "version": "4.0.0",
+                      "version": "4.0.1",
                       "from": "jsonpointer@>=4.0.0 <5.0.0",
-                      "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.0.tgz"
+                      "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.1.tgz"
                     },
                     "xtend": {
                       "version": "4.0.1",
@@ -2591,9 +2596,9 @@
                       "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.0.tgz"
                     },
                     "tweetnacl": {
-                      "version": "0.14.4",
+                      "version": "0.14.5",
                       "from": "tweetnacl@>=0.14.0 <0.15.0",
-                      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.4.tgz"
+                      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz"
                     },
                     "jodid25519": {
                       "version": "1.0.2",
@@ -2785,6 +2790,11 @@
         }
       }
     },
+    "lodash.merge": {
+      "version": "4.6.0",
+      "from": "lodash.merge@4.6.0",
+      "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.0.tgz"
+    },
     "memcached": {
       "version": "2.2.1",
       "from": "memcached@2.2.1",
@@ -3006,9 +3016,9 @@
               "resolved": "https://registry.npmjs.org/async/-/async-2.1.4.tgz",
               "dependencies": {
                 "lodash": {
-                  "version": "4.17.2",
+                  "version": "4.17.4",
                   "from": "lodash@>=4.14.0 <5.0.0",
-                  "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.2.tgz"
+                  "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz"
                 }
               }
             }
@@ -3100,9 +3110,9 @@
                   }
                 },
                 "jsonpointer": {
-                  "version": "4.0.0",
+                  "version": "4.0.1",
                   "from": "jsonpointer@>=4.0.0 <5.0.0",
-                  "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.0.tgz"
+                  "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.1.tgz"
                 },
                 "xtend": {
                   "version": "4.0.1",
@@ -3215,9 +3225,9 @@
                   "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.0.tgz"
                 },
                 "tweetnacl": {
-                  "version": "0.14.4",
+                  "version": "0.14.5",
                   "from": "tweetnacl@>=0.14.0 <0.15.0",
-                  "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.4.tgz"
+                  "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz"
                 },
                 "jodid25519": {
                   "version": "1.0.2",
@@ -3433,9 +3443,9 @@
           "resolved": "https://registry.npmjs.org/spdy/-/spdy-3.4.4.tgz",
           "dependencies": {
             "debug": {
-              "version": "2.3.3",
+              "version": "2.6.0",
               "from": "debug@>=2.2.0 <3.0.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-2.3.3.tgz",
+              "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.0.tgz",
               "dependencies": {
                 "ms": {
                   "version": "0.7.2",
@@ -3471,7 +3481,7 @@
                   "dependencies": {
                     "inherits": {
                       "version": "2.0.3",
-                      "from": "inherits@>=2.0.1 <2.1.0",
+                      "from": "inherits@>=2.0.1 <3.0.0",
                       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz"
                     }
                   }
@@ -3591,9 +3601,9 @@
           "resolved": "https://registry.npmjs.org/dtrace-provider/-/dtrace-provider-0.6.0.tgz",
           "dependencies": {
             "nan": {
-              "version": "2.4.0",
+              "version": "2.5.0",
               "from": "nan@>=2.0.8 <3.0.0",
-              "resolved": "https://registry.npmjs.org/nan/-/nan-2.4.0.tgz"
+              "resolved": "https://registry.npmjs.org/nan/-/nan-2.5.0.tgz"
             }
           }
         }
@@ -3793,9 +3803,9 @@
                           }
                         },
                         "jsonpointer": {
-                          "version": "4.0.0",
+                          "version": "4.0.1",
                           "from": "jsonpointer@>=4.0.0 <5.0.0",
-                          "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.0.tgz"
+                          "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-4.0.1.tgz"
                         },
                         "xtend": {
                           "version": "4.0.1",
@@ -3908,9 +3918,9 @@
                           "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.0.tgz"
                         },
                         "tweetnacl": {
-                          "version": "0.14.4",
+                          "version": "0.14.5",
                           "from": "tweetnacl@>=0.14.0 <0.15.0",
-                          "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.4.tgz"
+                          "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz"
                         },
                         "jodid25519": {
                           "version": "1.0.2",
@@ -4005,9 +4015,9 @@
           "resolved": "https://registry.npmjs.org/deeper/-/deeper-2.1.0.tgz"
         },
         "foreground-child": {
-          "version": "1.5.3",
+          "version": "1.5.6",
           "from": "foreground-child@>=1.3.3 <2.0.0",
-          "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-1.5.3.tgz",
+          "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-1.5.6.tgz",
           "dependencies": {
             "cross-spawn": {
               "version": "4.0.2",
@@ -4122,7 +4132,7 @@
           "dependencies": {
             "argparse": {
               "version": "1.0.9",
-              "from": "argparse@>=1.0.7 <2.0.0",
+              "from": "argparse@>=1.0.2 <2.0.0",
               "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
               "dependencies": {
                 "sprintf-js": {
@@ -5696,9 +5706,9 @@
               "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.2.tgz"
             },
             "debug": {
-              "version": "2.3.3",
+              "version": "2.6.0",
               "from": "debug@>=2.1.3 <3.0.0",
-              "resolved": "https://registry.npmjs.org/debug/-/debug-2.3.3.tgz",
+              "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.0.tgz",
               "dependencies": {
                 "ms": {
                   "version": "0.7.2",
@@ -5782,7 +5792,7 @@
             },
             "inherits": {
               "version": "2.0.3",
-              "from": "inherits@>=2.0.1 <2.1.0",
+              "from": "inherits@>=2.0.0 <3.0.0",
               "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz"
             }
           }
diff --git a/package.json b/package.json
index 72614fe..a65b424 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
     "deep-equal": "1.0.1",
     "ip": "1.1.3",
     "ip-reputation-js-client": "1.0.1",
+    "lodash.merge": "4.6.0",
     "memcached": "2.2.1",
     "newrelic": "1.30.1",
     "restify": "4.1.1"
diff --git a/scripts/config-set.js b/scripts/config-set.js
index fcd61f9..632a91e 100755
--- a/scripts/config-set.js
+++ b/scripts/config-set.js
@@ -22,6 +22,7 @@
 var Memcached = require('memcached')
 var P = require('bluebird')
 var BL = require('bl')
+var merge = require('lodash.merge')
 
 P.promisifyAll(Memcached.prototype)
 
@@ -35,6 +36,17 @@ if (!/.+:\d+/.test(process.argv[2])) {
   return console.error(x)
 }
 
+function writeMergedSettings(mc, key, newSettings) {
+  return mc.getAsync(key)
+    .then(
+      function (settings) {
+        settings = settings || {}
+        merge(settings, newSettings)
+        return mc.setAsync(key, settings, 0)
+      }
+    )
+}
+
 var b = process.stdin.pipe(new BL())
 
 process.stdin.on('end', function () {
@@ -49,19 +61,19 @@ process.stdin.on('end', function () {
 
   var actions = []
   if (input.limits) {
-    actions.push(mc.setAsync('limits', input.limits, 0))
+    actions.push(writeMergedSettings(mc, 'limits', input.limits))
   }
 
   if (input.allowedIPs) {
-    actions.push(mc.setAsync('allowedIPs', input.allowedIPs, 0))
+    actions.push(writeMergedSettings(mc, 'allowedIPs', input.allowedIPs))
   }
 
   if (input.allowedEmailDomains) {
-    actions.push(mc.setAsync('allowedEmailDomains', input.allowedEmailDomains, 0))
+    actions.push(writeMergedSettings(mc, 'allowedEmailDomains', input.allowedEmailDomains))
   }
 
   if (input.requestChecks) {
-    actions.push(mc.setAsync('requestChecks', input.requestChecks, 0))
+    actions.push(writeMergedSettings(mc, 'requestChecks', input.requestChecks))
   }
 
   P.all(actions)