diff --git a/apollo-example-backend/yarn.lock b/apollo-example-backend/yarn.lock
index 99863e7..249e35c 100644
--- a/apollo-example-backend/yarn.lock
+++ b/apollo-example-backend/yarn.lock
@@ -875,9 +875,9 @@ backo2@^1.0.2:
   resolved "https://registry.yarnpkg.com/backo2/-/backo2-1.0.2.tgz#31ab1ac8b129363463e35b3ebb69f4dfcfba7947"
 
 balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz#e83e3a7e3f300b34cb9d87f615fa0cbf357690ee"
+  integrity sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==
 
 bcrypt-pbkdf@^1.0.0:
   version "1.0.2"
@@ -897,6 +897,7 @@ binary-extensions@^1.0.0:
 block-stream@*:
   version "0.0.9"
   resolved "https://registry.yarnpkg.com/block-stream/-/block-stream-0.0.9.tgz#13ebfe778a03205cfe03751481ebb4b3300c126a"
+  integrity sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=
   dependencies:
     inherits "~2.0.0"
 
@@ -1681,7 +1682,7 @@ fstream-ignore@^1.0.5:
     inherits "2"
     minimatch "^3.0.0"
 
-fstream@^1.0.0, fstream@^1.0.10, fstream@^1.0.2:
+fstream@^1.0.0, fstream@^1.0.10, fstream@^1.0.12:
   version "1.0.12"
   resolved "https://registry.yarnpkg.com/fstream/-/fstream-1.0.12.tgz#4e8ba8ee2d48be4f7d0de505455548eae5932045"
   integrity sha512-WvJ193OHa0GHPEL+AycEJgxvBEwyfRkN1vhjca23OaPVMCaLCXTd5qAu82AjTcgP1UJmytkOKb63Ypde7raDIg==
@@ -1744,9 +1745,9 @@ glob@^7.0.3, glob@^7.1.2:
     path-is-absolute "^1.0.0"
 
 glob@^7.1.3:
-  version "7.1.6"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.6.tgz#141f33b81a7c2492e125594307480c46679278a6"
-  integrity sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==
+  version "7.1.7"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.7.tgz#3b193e9233f01d42d0b3f78294bbeeb418f94a90"
+  integrity sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==
   dependencies:
     fs.realpath "^1.0.0"
     inflight "^1.0.4"
@@ -1790,11 +1791,16 @@ got@^3.2.0:
     read-all-stream "^3.0.0"
     timed-out "^2.0.0"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.4:
+graceful-fs@^4.1.11, graceful-fs@^4.1.4:
   version "4.2.3"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.3.tgz#4a12ff1b60376ef09862c2093edd908328be8423"
   integrity sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ==
 
+graceful-fs@^4.1.2:
+  version "4.2.6"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.6.tgz#ff040b2b0853b23c3d31027523706f1885d76bee"
+  integrity sha512-nTnJ528pbqxYanhpDYsi4Rd8MAeaBA67+RZ10CM1m3bTAVFEDcd5AuA4a6W5YkGZ1iNXHzZz8T6TBKLeBuNriQ==
+
 graphql-server-express@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/graphql-server-express/-/graphql-server-express-1.1.2.tgz#6e8a306a6616ac72c7850efa9fda9cba29836335"
@@ -3263,11 +3269,12 @@ tar-pack@^3.4.0:
     uid-number "^0.0.6"
 
 tar@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-2.2.1.tgz#8e4d2a256c0e2185c6b18ad694aec968b83cb1d1"
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/tar/-/tar-2.2.2.tgz#0ca8848562c7299b8b446ff6a4d60cdbb23edc40"
+  integrity sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==
   dependencies:
     block-stream "*"
-    fstream "^1.0.2"
+    fstream "^1.0.12"
     inherits "2"
 
 text-table@^0.2.0, text-table@~0.2.0: