diff --git a/examples/express/yarn.lock b/examples/express/yarn.lock
index 4aaa748..4d9c085 100644
--- a/examples/express/yarn.lock
+++ b/examples/express/yarn.lock
@@ -23,7 +23,7 @@
 
 "@types/events@*":
   version "1.2.0"
-  resolved "http://registry.npmjs.org/@types/events/-/events-1.2.0.tgz#81a6731ce4df43619e5c8c945383b3e62a89ea86"
+  resolved "https://registry.npmjs.org/@types/events/-/events-1.2.0.tgz#81a6731ce4df43619e5c8c945383b3e62a89ea86"
 
 "@types/express-graphql@^0.6.2":
   version "0.6.2"
@@ -87,7 +87,7 @@ accepts@^1.3.5, accepts@~1.3.5:
 
 array-flatten@1.1.1:
   version "1.1.1"
-  resolved "http://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz#9a5f699051b1e7073328f2a008968b64ea2955d2"
+  resolved "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz#9a5f699051b1e7073328f2a008968b64ea2955d2"
 
 arrify@^1.0.0:
   version "1.0.1"
@@ -122,7 +122,7 @@ bytes@3.0.0:
 
 content-disposition@0.5.2:
   version "0.5.2"
-  resolved "http://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz#0cf68bb9ddf5f2be7961c3a85178cb85dba78cb4"
+  resolved "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz#0cf68bb9ddf5f2be7961c3a85178cb85dba78cb4"
 
 content-type@^1.0.4, content-type@~1.0.4:
   version "1.0.4"
@@ -216,7 +216,7 @@ express@^4.16.4:
 
 finalhandler@1.1.1:
   version "1.1.1"
-  resolved "http://registry.npmjs.org/finalhandler/-/finalhandler-1.1.1.tgz#eebf4ed840079c83f4249038c9d703008301b105"
+  resolved "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.1.tgz#eebf4ed840079c83f4249038c9d703008301b105"
   dependencies:
     debug "2.6.9"
     encodeurl "~1.0.2"
@@ -234,9 +234,9 @@ fresh@0.5.2:
   version "0.5.2"
   resolved "https://registry.yarnpkg.com/fresh/-/fresh-0.5.2.tgz#3d8cadd90d976569fa835ab1f8e4b23a105605a7"
 
-graphql-to-mongodb@1.6.1:
-  version "1.6.1"
-  resolved "https://registry.yarnpkg.com/graphql-to-mongodb/-/graphql-to-mongodb-1.6.1.tgz#8a17317053e07d478c1b9a477f39588a3d4f12cf"
+graphql-to-mongodb@1.6.5:
+  version "1.6.5"
+  resolved "https://registry.yarnpkg.com/graphql-to-mongodb/-/graphql-to-mongodb-1.6.5.tgz#3504bc43349a7086d7dcae9c172cabc7aae20318"
 
 graphql@^14.0.2:
   version "14.0.2"
@@ -246,7 +246,7 @@ graphql@^14.0.2:
 
 http-errors@1.6.3, http-errors@~1.6.2, http-errors@~1.6.3:
   version "1.6.3"
-  resolved "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz#8b55680bb4be283a0b5bf4ea2e38580be1d9320d"
+  resolved "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz#8b55680bb4be283a0b5bf4ea2e38580be1d9320d"
   dependencies:
     depd "~1.1.2"
     inherits "2.0.3"
@@ -287,7 +287,7 @@ make-error@^1.1.1:
 
 media-typer@0.3.0:
   version "0.3.0"
-  resolved "http://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
+  resolved "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
 
 memory-pager@^1.0.2:
   version "1.3.1"
@@ -317,21 +317,21 @@ mime@1.4.1:
 
 minimist@0.0.8:
   version "0.0.8"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
 minimist@^1.2.0:
   version "1.2.0"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
 mkdirp@^0.5.1:
   version "0.5.1"
-  resolved "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+  resolved "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
     minimist "0.0.8"
 
-mongodb-core@3.1.9:
-  version "3.1.9"
-  resolved "https://registry.yarnpkg.com/mongodb-core/-/mongodb-core-3.1.9.tgz#c31ee407bf932b0149eaed775c17ee09974e4ca3"
+mongodb-core@3.1.11:
+  version "3.1.11"
+  resolved "https://registry.yarnpkg.com/mongodb-core/-/mongodb-core-3.1.11.tgz#b253038dbb4d7329f3d1c2ee5400bb0c9221fde5"
   dependencies:
     bson "^1.1.0"
     require_optional "^1.0.1"
@@ -340,10 +340,10 @@ mongodb-core@3.1.9:
     saslprep "^1.0.0"
 
 mongodb@^3.1.10:
-  version "3.1.10"
-  resolved "https://registry.yarnpkg.com/mongodb/-/mongodb-3.1.10.tgz#45ad9b74ea376f4122d0881b75e5489b9e504ed7"
+  version "3.1.13"
+  resolved "https://registry.yarnpkg.com/mongodb/-/mongodb-3.1.13.tgz#f8cdcbb36ad7a08b570bd1271c8525753f75f9f4"
   dependencies:
-    mongodb-core "3.1.9"
+    mongodb-core "3.1.11"
     safe-buffer "^5.1.2"
 
 ms@2.0.0: