diff --git a/backend/package.json b/backend/package.json
index af148bc8c..1c74d3faa 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -42,7 +42,7 @@
     ]
   },
   "dependencies": {
-    "@hapi/joi": "^15.1.0",
+    "@hapi/joi": "^15.1.1",
     "activitystrea.ms": "~2.1.3",
     "apollo-cache-inmemory": "~1.6.3",
     "apollo-client": "~2.6.4",
diff --git a/backend/yarn.lock b/backend/yarn.lock
index 1ad799c18..186520186 100644
--- a/backend/yarn.lock
+++ b/backend/yarn.lock
@@ -768,31 +768,26 @@
   resolved "https://registry.yarnpkg.com/@hapi/address/-/address-2.0.0.tgz#9f05469c88cb2fd3dcd624776b54ee95c312126a"
   integrity sha512-mV6T0IYqb0xL1UALPFplXYQmR0twnXG0M6jUswpquqT2sD12BOiCiLy3EvMp/Fy7s3DZElC4/aPjEjo2jeZpvw==
 
-"@hapi/hoek@6.x.x":
-  version "6.2.4"
-  resolved "https://registry.yarnpkg.com/@hapi/hoek/-/hoek-6.2.4.tgz#4b95fbaccbfba90185690890bdf1a2fbbda10595"
-  integrity sha512-HOJ20Kc93DkDVvjwHyHawPwPkX44sIrbXazAUDiUXaY2R9JwQGo2PhFfnQtdrsIe4igjG2fPgMra7NYw7qhy0A==
+"@hapi/bourne@1.x.x":
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/@hapi/bourne/-/bourne-1.3.2.tgz#0a7095adea067243ce3283e1b56b8a8f453b242a"
+  integrity sha512-1dVNHT76Uu5N3eJNTYcvxee+jzX4Z9lfciqRRHCU27ihbUcYi+iSc2iml5Ke1LXe1SyJCLA0+14Jh4tXJgOppA==
 
 "@hapi/hoek@8.x.x":
   version "8.0.1"
   resolved "https://registry.yarnpkg.com/@hapi/hoek/-/hoek-8.0.1.tgz#9712fa2ad124ac64668ab06ba847b1eaf83a03fd"
   integrity sha512-cctMYH5RLbElaUpZn3IJaUj9QNQD8iXDnl7xNY6KB1aFD2ciJrwpo3kvZowIT75uA+silJFDnSR2kGakALUymg==
 
-"@hapi/joi@^15.0.3", "@hapi/joi@^15.1.0":
-  version "15.1.0"
-  resolved "https://registry.yarnpkg.com/@hapi/joi/-/joi-15.1.0.tgz#940cb749b5c55c26ab3b34ce362e82b6162c8e7a"
-  integrity sha512-n6kaRQO8S+kepUTbXL9O/UOL788Odqs38/VOfoCrATDtTvyfiO3fgjlSRaNkHabpTLgM7qru9ifqXlXbXk8SeQ==
+"@hapi/joi@^15.0.3", "@hapi/joi@^15.1.0", "@hapi/joi@^15.1.1":
+  version "15.1.1"
+  resolved "https://registry.yarnpkg.com/@hapi/joi/-/joi-15.1.1.tgz#c675b8a71296f02833f8d6d243b34c57b8ce19d7"
+  integrity sha512-entf8ZMOK8sc+8YfeOlM8pCfg3b5+WZIKBfUaaJT8UsjAAPjartzxIYm3TIbjvA4u+u++KbcXD38k682nVHDAQ==
   dependencies:
     "@hapi/address" "2.x.x"
-    "@hapi/hoek" "6.x.x"
-    "@hapi/marker" "1.x.x"
+    "@hapi/bourne" "1.x.x"
+    "@hapi/hoek" "8.x.x"
     "@hapi/topo" "3.x.x"
 
-"@hapi/marker@1.x.x":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@hapi/marker/-/marker-1.0.0.tgz#65b0b2b01d1be06304886ce9b4b77b1bfb21a769"
-  integrity sha512-JOfdekTXnJexfE8PyhZFyHvHjt81rBFSAbTIRAhF2vv/2Y1JzoKsGqxH/GpZJoF7aEfYok8JVcAHmSz1gkBieA==
-
 "@hapi/topo@3.x.x":
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/@hapi/topo/-/topo-3.1.2.tgz#57cc1317be1a8c5f47c124f9b0e3c49cd78424d2"