diff --git a/backend/yarn.lock b/backend/yarn.lock
index 819b215c5..a3011433e 100644
--- a/backend/yarn.lock
+++ b/backend/yarn.lock
@@ -1943,7 +1943,7 @@ apollo-server-caching@^0.5.1:
   dependencies:
     lru-cache "^5.0.0"
 
-apollo-server-core@^2.10.0, apollo-server-core@^2.9.16:
+apollo-server-core@^2.10.0:
   version "2.10.0"
   resolved "https://registry.yarnpkg.com/apollo-server-core/-/apollo-server-core-2.10.0.tgz#b8d51bdffe6529f0e3ca670ee8f1238765cfade4"
   integrity sha512-x/UK6XvU307W8D/pzTclU04JIjRarcbg5mFPe0nVmO4OTc26uQgKi1WlZkcewXsAUnn+nDwKVn2c2G3dHEgXzQ==
@@ -2774,6 +2774,11 @@ clone-response@^1.0.2:
   dependencies:
     mimic-response "^1.0.0"
 
+cluster-key-slot@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/cluster-key-slot/-/cluster-key-slot-1.1.0.tgz#30474b2a981fb12172695833052bc0d01336d10d"
+  integrity sha512-2Nii8p3RwAPiFwsnZvukotvow2rIHM+yQ6ZcBXGHdniadkYGZYiGmkHJIbZPIV9nfv7m/U1IPMVVcAhoWFeklw==
+
 co@^4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
@@ -3254,6 +3259,11 @@ delegates@^1.0.0:
   resolved "https://registry.yarnpkg.com/delegates/-/delegates-1.0.0.tgz#84c6e159b81904fdca59a0ef44cd870d31250f9a"
   integrity sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=
 
+denque@^1.1.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/denque/-/denque-1.4.1.tgz#6744ff7641c148c3f8a69c307e51235c1f4a37cf"
+  integrity sha512-OfzPuSZKGcgr96rf1oODnfjqBFmr1DVoc/TrItj3Ohe0Ah1C5WX5Baquw/9U9KovnQ88EqmJbD66rKYUQYN1tQ==
+
 depd@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/depd/-/depd-2.0.0.tgz#b696163cc757560d09cf22cc8fad1571b79e76df"
@@ -4476,6 +4486,15 @@ graphql-middleware@~4.0.2:
   dependencies:
     graphql-tools "^4.0.5"
 
+graphql-redis-subscriptions@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/graphql-redis-subscriptions/-/graphql-redis-subscriptions-2.1.2.tgz#9c1b744bace0c6ba99dd0ebafe0148cad1df3301"
+  integrity sha512-l69KbGxyYfVHxvE+Dzv9/hXg/q+Xnjfx1JsrJD6ikePuSsNaCSNxr+MubSTNF3Gt3C/+JZs4FaWImFeK/+X2og==
+  dependencies:
+    iterall "^1.2.2"
+  optionalDependencies:
+    ioredis "^4.6.3"
+
 graphql-shield@~7.0.10:
   version "7.0.10"
   resolved "https://registry.yarnpkg.com/graphql-shield/-/graphql-shield-7.0.10.tgz#c25517a07e97bfd74089fde66ea2d2044addf743"
@@ -4920,6 +4939,21 @@ invariant@^2.2.2, invariant@^2.2.4:
   dependencies:
     loose-envify "^1.0.0"
 
+ioredis@^4.14.1, ioredis@^4.6.3:
+  version "4.14.1"
+  resolved "https://registry.yarnpkg.com/ioredis/-/ioredis-4.14.1.tgz#b73ded95fcf220f106d33125a92ef6213aa31318"
+  integrity sha512-94W+X//GHM+1GJvDk6JPc+8qlM7Dul+9K+lg3/aHixPN7ZGkW6qlvX0DG6At9hWtH2v3B32myfZqWoANUJYGJA==
+  dependencies:
+    cluster-key-slot "^1.1.0"
+    debug "^4.1.1"
+    denque "^1.1.0"
+    lodash.defaults "^4.2.0"
+    lodash.flatten "^4.4.0"
+    redis-commands "1.5.0"
+    redis-errors "^1.2.0"
+    redis-parser "^3.0.0"
+    standard-as-callback "^2.0.1"
+
 ip-regex@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/ip-regex/-/ip-regex-1.0.3.tgz#dc589076f659f419c222039a33316f1c7387effd"
@@ -5960,11 +5994,21 @@ lodash.clonedeep@^4.5.0:
   resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
   integrity sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8=
 
+lodash.defaults@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/lodash.defaults/-/lodash.defaults-4.2.0.tgz#d09178716ffea4dde9e5fb7b37f6f0802274580c"
+  integrity sha1-0JF4cW/+pN3p5ft7N/bwgCJ0WAw=
+
 lodash.escaperegexp@^4.1.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/lodash.escaperegexp/-/lodash.escaperegexp-4.1.2.tgz#64762c48618082518ac3df4ccf5d5886dae20347"
   integrity sha1-ZHYsSGGAglGKw99Mz11YhtriA0c=
 
+lodash.flatten@^4.4.0:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/lodash.flatten/-/lodash.flatten-4.4.0.tgz#f31c22225a9632d2bbf8e4addbef240aa765a61f"
+  integrity sha1-8xwiIlqWMtK7+OSt2+8kCqdlph8=
+
 lodash.includes@^4.3.0:
   version "4.3.0"
   resolved "https://registry.yarnpkg.com/lodash.includes/-/lodash.includes-4.3.0.tgz#60bb98a87cb923c68ca1e51325483314849f553f"
@@ -7506,6 +7550,23 @@ realpath-native@^1.1.0:
   dependencies:
     util.promisify "^1.0.0"
 
+redis-commands@1.5.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/redis-commands/-/redis-commands-1.5.0.tgz#80d2e20698fe688f227127ff9e5164a7dd17e785"
+  integrity sha512-6KxamqpZ468MeQC3bkWmCB1fp56XL64D4Kf0zJSwDZbVLLm7KFkoIcHrgRvQ+sk8dnhySs7+yBg94yIkAK7aJg==
+
+redis-errors@^1.0.0, redis-errors@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/redis-errors/-/redis-errors-1.2.0.tgz#eb62d2adb15e4eaf4610c04afe1529384250abad"
+  integrity sha1-62LSrbFeTq9GEMBK/hUpOEJQq60=
+
+redis-parser@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/redis-parser/-/redis-parser-3.0.0.tgz#b66d828cdcafe6b4b8a428a7def4c6bcac31c8b4"
+  integrity sha1-tm2CjNyv5rS4pCin3vTGvKwxyLQ=
+  dependencies:
+    redis-errors "^1.0.0"
+
 referrer-policy@1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/referrer-policy/-/referrer-policy-1.2.0.tgz#b99cfb8b57090dc454895ef897a4cc35ef67a98e"
@@ -8203,6 +8264,11 @@ stacktrace-js@^2.0.0:
     stack-generator "^2.0.1"
     stacktrace-gps "^3.0.1"
 
+standard-as-callback@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/standard-as-callback/-/standard-as-callback-2.0.1.tgz#ed8bb25648e15831759b6023bdb87e6b60b38126"
+  integrity sha512-NQOxSeB8gOI5WjSaxjBgog2QFw55FV8TkS6Y07BiB3VJ8xNTvUYm0wl0s8ObgQ5NhdpnNfigMIKjgPESzgr4tg==
+
 static-extend@^0.1.1:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/static-extend/-/static-extend-0.1.2.tgz#60809c39cbff55337226fd5e0b520f341f1fb5c6"