diff --git a/apollo-server/yarn.lock b/apollo-server/yarn.lock
index fa1f595..117aa8f 100644
--- a/apollo-server/yarn.lock
+++ b/apollo-server/yarn.lock
@@ -429,7 +429,7 @@ eventemitter3@^3.1.0:
 
 express@^4.0.0:
   version "4.16.3"
-  resolved "http://registry.npmjs.org/express/-/express-4.16.3.tgz#6af8a502350db3246ecc4becf6b5a34d22f7ed53"
+  resolved "https://registry.npmjs.org/express/-/express-4.16.3.tgz#6af8a502350db3246ecc4becf6b5a34d22f7ed53"
   dependencies:
     accepts "~1.3.5"
     array-flatten "1.1.1"
@@ -502,7 +502,7 @@ graphql-extensions@^0.2.1:
 
 graphql-subscriptions@^0.5.8:
   version "0.5.8"
-  resolved "http://registry.npmjs.org/graphql-subscriptions/-/graphql-subscriptions-0.5.8.tgz#13a6143c546bce390404657dc73ca501def30aa7"
+  resolved "https://registry.npmjs.org/graphql-subscriptions/-/graphql-subscriptions-0.5.8.tgz#13a6143c546bce390404657dc73ca501def30aa7"
   dependencies:
     iterall "^1.2.1"
 
@@ -522,7 +522,7 @@ graphql-tools@^3.0.4:
 
 graphql@^0.13.2:
   version "0.13.2"
-  resolved "http://registry.npmjs.org/graphql/-/graphql-0.13.2.tgz#4c740ae3c222823e7004096f832e7b93b2108270"
+  resolved "https://registry.npmjs.org/graphql/-/graphql-0.13.2.tgz#4c740ae3c222823e7004096f832e7b93b2108270"
   dependencies:
     iterall "^1.2.1"
 
@@ -554,7 +554,7 @@ http-errors@1.6.2:
 
 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"
@@ -758,7 +758,7 @@ raw-body@2.3.3:
 
 readable-stream@1.1.x:
   version "1.1.14"
-  resolved "http://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz#7cf4c54ef648e3813084c636dd2079e166c081d9"
+  resolved "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz#7cf4c54ef648e3813084c636dd2079e166c081d9"
   dependencies:
     core-util-is "~1.0.0"
     inherits "~2.0.1"
@@ -877,8 +877,8 @@ vary@^1, vary@~1.1.2:
   resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.2.tgz#2299f02c6ded30d4a5961b0b9f74524a18f634fc"
 
 ws@^5.2.0:
-  version "5.2.2"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-5.2.2.tgz#dffef14866b8e8dc9133582514d1befaf96e980f"
+  version "5.2.4"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-5.2.4.tgz#c7bea9f1cfb5f410de50e70e82662e562113f9a7"
   dependencies:
     async-limiter "~1.0.0"