diff --git a/.tool-versions b/.tool-versions
index 4b93af6e..0098a60d 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
 erlang 23.3.4.18
-elixir 1.11.4
+elixir 1.12.3-otp-23
diff --git a/apps/cf/lib/accounts/invitations.ex b/apps/cf/lib/accounts/invitations.ex
index a16a3f0c..14295617 100644
--- a/apps/cf/lib/accounts/invitations.ex
+++ b/apps/cf/lib/accounts/invitations.ex
@@ -163,9 +163,7 @@ defmodule CF.Accounts.Invitations do
     frontend_url = Application.fetch_env!(:cf, :frontend_url)
 
     Logger.info(
-      "Generated #{number} invites for token #{token}. Url: #{frontend_url}/signup?invitation_token=#{
-        token
-      }"
+      "Generated #{number} invites for token #{token}. Url: #{frontend_url}/signup?invitation_token=#{token}"
     )
   end
 
diff --git a/apps/cf/lib/accounts/user_permissions.ex b/apps/cf/lib/accounts/user_permissions.ex
index 1d5632c6..5eba5f73 100644
--- a/apps/cf/lib/accounts/user_permissions.ex
+++ b/apps/cf/lib/accounts/user_permissions.ex
@@ -66,9 +66,7 @@ defmodule CF.Accounts.UserPermissions do
         if action_count >= limit + @limit_warning_threshold,
           do:
             Logger.warn(fn ->
-              "User #{user.username} (#{user.id}) overthrown its limit for [#{action_type} #{
-                entity
-              }] (#{action_count}/#{limit})"
+              "User #{user.username} (#{user.id}) overthrown its limit for [#{action_type} #{entity}] (#{action_count}/#{limit})"
             end)
 
         {:error, @error_limit_reached}
diff --git a/apps/cf/mix.exs b/apps/cf/mix.exs
index 60d0fcb1..bbe1aaa2 100644
--- a/apps/cf/mix.exs
+++ b/apps/cf/mix.exs
@@ -37,8 +37,8 @@ defmodule CF.Mixfile do
   # Type `mix help deps` for examples and options.
   defp deps do
     [
-      {:phoenix, "~> 1.4.18", override: true},
-      {:phoenix_html, "~> 2.6"},
+      {:phoenix, "~> 1.5.14", override: true},
+      {:phoenix_html, "~> 2.14.3"},
       {:gettext, "~> 0.13.1"},
       {:google_api_you_tube, "~> 0.42.0"},
       {:kaur, "~> 1.1"},
diff --git a/apps/cf_atom_feed/test/comments_test.exs b/apps/cf_atom_feed/test/comments_test.exs
index c5521fcc..5364bdf0 100644
--- a/apps/cf_atom_feed/test/comments_test.exs
+++ b/apps/cf_atom_feed/test/comments_test.exs
@@ -30,9 +30,7 @@ defmodule CF.AtomFeed.CommentsTest do
     # Check comment entries
     for comment <- comments do
       assert feed =~
-               ~r(https://TEST_FRONTEND/videos/[a-zA-Z0-9]+\?statement=#{comment.statement_id}&amp;c=#{
-                 comment.id
-               }"/>)
+               ~r(https://TEST_FRONTEND/videos/[a-zA-Z0-9]+\?statement=#{comment.statement_id}&amp;c=#{comment.id}"/>)
 
       assert feed =~ ~r(<title>New Comment from .+ on ##{comment.statement_id}</title>)
     end
diff --git a/apps/cf_graphql/config/config.exs b/apps/cf_graphql/config/config.exs
index eabecc81..2ba311b6 100644
--- a/apps/cf_graphql/config/config.exs
+++ b/apps/cf_graphql/config/config.exs
@@ -15,7 +15,7 @@ config :cf_graphql,
 config :cf_graphql, CF.GraphQLWeb.Endpoint,
   url: [host: "localhost"],
   secret_key_base: "Nl5lfMlBMvQpY3n74G9iNTxH4okMpbMWArWst9Vhj75tl+m2PuV+KPwjX0fNMaa8",
-  pubsub: [name: CF.Graphql.PubSub, adapter: Phoenix.PubSub.PG2],
+  pubsub_server: CF.Graphql.PubSub,
   server: true
 
 # Configures Elixir's Logger
diff --git a/apps/cf_graphql/lib/application.ex b/apps/cf_graphql/lib/application.ex
index 7da91cb5..64ca65a6 100644
--- a/apps/cf_graphql/lib/application.ex
+++ b/apps/cf_graphql/lib/application.ex
@@ -8,6 +8,8 @@ defmodule CF.Graphql.Application do
 
     # Define workers and child supervisors to be supervised
     children = [
+      # Start the PubSub system
+      {Phoenix.PubSub, name: CF.Graphql.PubSub},
       # Start the endpoint when the application starts
       supervisor(CF.GraphQLWeb.Endpoint, [])
     ]
diff --git a/apps/cf_graphql/mix.exs b/apps/cf_graphql/mix.exs
index ad5002b5..2bbfc056 100644
--- a/apps/cf_graphql/mix.exs
+++ b/apps/cf_graphql/mix.exs
@@ -32,9 +32,9 @@ defmodule CF.Graphql.Mixfile do
 
   defp deps do
     [
-      {:phoenix, "~> 1.4.18"},
+      {:phoenix, "~> 1.5.14"},
       {:plug, "~> 1.7"},
-      {:phoenix_pubsub, "~> 1.0"},
+      {:phoenix_pubsub, "~> 2.0"},
       {:cowboy, "~> 2.0"},
       {:corsica, "~> 2.1"},
       {:absinthe_ecto, "~> 0.1.3"},
diff --git a/apps/cf_graphql/test/support/conn_case.ex b/apps/cf_graphql/test/support/conn_case.ex
index 81aa43b9..89aa788d 100644
--- a/apps/cf_graphql/test/support/conn_case.ex
+++ b/apps/cf_graphql/test/support/conn_case.ex
@@ -3,10 +3,6 @@ defmodule CF.Graphql.ConnCase do
   This module defines the test case to be used by
   tests that require setting up a connection.
 
-  Such tests rely on `Phoenix.ConnTest` and also
-  import other functionality to make it easier
-  to build common datastructures and query the data layer.
-
   Finally, if the test case interacts with the database,
   it cannot be async. For this reason, every test runs
   inside a transaction which is reset at the beginning
@@ -18,7 +14,8 @@ defmodule CF.Graphql.ConnCase do
   using do
     quote do
       # Import conveniences for testing with connections
-      use Phoenix.ConnTest
+      import Plug.Conn
+      import Phoenix.ConnTest
       import CF.GraphQLWeb.Router.Helpers
 
       # The default endpoint for testing
diff --git a/apps/cf_rest_api/config/config.exs b/apps/cf_rest_api/config/config.exs
index 7967704a..a6e4b34c 100644
--- a/apps/cf_rest_api/config/config.exs
+++ b/apps/cf_rest_api/config/config.exs
@@ -7,7 +7,7 @@ config :cf_rest_api,
 config :cf_rest_api, CF.RestApi.Endpoint,
   url: [host: "localhost"],
   render_errors: [view: CF.RestApi.ErrorView, accepts: ~w(json), default_format: "json"],
-  pubsub: [name: CF.RestApi.PubSub, adapter: Phoenix.PubSub.PG2],
+  pubsub_server: CF.RestApi.PubSub,
   server: true
 
 # Configure Postgres pool size
diff --git a/apps/cf_rest_api/lib/application.ex b/apps/cf_rest_api/lib/application.ex
index 9e3dbde6..33368ed0 100644
--- a/apps/cf_rest_api/lib/application.ex
+++ b/apps/cf_rest_api/lib/application.ex
@@ -6,6 +6,8 @@ defmodule CF.RestApi.Application do
 
     # Define workers and child supervisors to be supervised
     children = [
+      # Start the PubSub system
+      {Phoenix.PubSub, name: CF.RestApi.PubSub},
       # Start the endpoint when the application starts
       supervisor(CF.RestApi.Endpoint, []),
       # Presence to track number of connected users to a channel
diff --git a/apps/cf_rest_api/mix.exs b/apps/cf_rest_api/mix.exs
index 05078a75..696876ed 100644
--- a/apps/cf_rest_api/mix.exs
+++ b/apps/cf_rest_api/mix.exs
@@ -39,12 +39,12 @@ defmodule CF.RestApi.Mixfile do
       {:cowboy, "~> 2.0"},
       {:gettext, "~> 0.13.1"},
       {:kaur, "~> 1.1"},
-      {:phoenix, "~> 1.4.18", override: true},
-      {:phoenix_html, "~> 2.6"},
-      {:phoenix_pubsub, "~> 1.0"},
+      {:phoenix, "~> 1.5.14", override: true},
+      {:phoenix_html, "~> 2.14.3"},
+      {:phoenix_pubsub, "~> 2.0"},
       {:poison, "~> 3.1"},
       {:scout_apm, "~> 1.0.6"},
-      {:plug_cowboy, "~> 2.0"},
+      {:plug_cowboy, "~> 2.1"},
 
       # ---- Internal ----
       {:cf, in_umbrella: true},
diff --git a/apps/cf_rest_api/test/support/conn_case.ex b/apps/cf_rest_api/test/support/conn_case.ex
index 613c6ec5..5728ecb2 100644
--- a/apps/cf_rest_api/test/support/conn_case.ex
+++ b/apps/cf_rest_api/test/support/conn_case.ex
@@ -3,10 +3,6 @@ defmodule CF.RestApi.ConnCase do
   This module defines the test case to be used by
   tests that require setting up a connection.
 
-  Such tests rely on `Phoenix.ConnTest` and also
-  import other functionality to make it easier
-  to build and query models.
-
   Finally, if the test case interacts with the database,
   it cannot be async. For this reason, every test runs
   inside a transaction which is reset at the beginning
@@ -18,7 +14,8 @@ defmodule CF.RestApi.ConnCase do
   using do
     quote do
       # Import conveniences for testing with connections
-      use Phoenix.ConnTest
+      import Plug.Conn
+      import Phoenix.ConnTest
       import CF.RestApi.Router.Helpers
 
       # The default endpoint for testing
diff --git a/apps/cf_reverse_proxy/mix.exs b/apps/cf_reverse_proxy/mix.exs
index 157360f5..b03ff95e 100644
--- a/apps/cf_reverse_proxy/mix.exs
+++ b/apps/cf_reverse_proxy/mix.exs
@@ -37,7 +37,7 @@ defmodule CF.ReverseProxy.Mixfile do
       {:cf_rest_api, in_umbrella: true},
       {:cf_graphql, in_umbrella: true},
       {:cf_atom_feed, in_umbrella: true},
-      {:phoenix, "~> 1.4.18"},
+      {:phoenix, "~> 1.5.14"},
       {:cowboy, "~> 2.0"},
       {:corsica, "~> 2.1"}
     ]
diff --git a/mix.lock b/mix.lock
index 3d46c25d..afc5b65e 100644
--- a/mix.lock
+++ b/mix.lock
@@ -80,12 +80,12 @@
   "oauth2": {:hex, :oauth2, "0.9.4", "632e8e8826a45e33ac2ea5ac66dcc019ba6bb5a0d2ba77e342d33e3b7b252c6e", [:mix], [{:hackney, "~> 1.7", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "407c6b9f60aa0d01b915e2347dc6be78adca706a37f0c530808942da3b62e7af"},
   "parallel_stream": {:hex, :parallel_stream, "1.0.6", "b967be2b23f0f6787fab7ed681b4c45a215a81481fb62b01a5b750fa8f30f76c", [:mix], [], "hexpm", "639b2e8749e11b87b9eb42f2ad325d161c170b39b288ac8d04c4f31f8f0823eb"},
   "parse_trans": {:hex, :parse_trans, "3.4.1", "6e6aa8167cb44cc8f39441d05193be6e6f4e7c2946cb2759f015f8c56b76e5ff", [:rebar3], [], "hexpm", "620a406ce75dada827b82e453c19cf06776be266f5a67cff34e1ef2cbb60e49a"},
-  "phoenix": {:hex, :phoenix, "1.4.18", "3f586505ae17bdcfd044572b59c9a3be2761bb67e1d7c97cc5046ff750e0831a", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 1.1", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.8.1 or ~> 1.9", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 1.0 or ~> 2.0", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "13844c7aeff41df88ca1313dafdc9603b2b2e689d8b72f77a3dcaef6c2b6463c"},
-  "phoenix_html": {:hex, :phoenix_html, "2.11.2", "86ebd768258ba60a27f5578bec83095bdb93485d646fc4111db8844c316602d6", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "2fe8543036a9cb2103efe26c18874512dc0e005afba60dbfe90aa56e27c198a2"},
-  "phoenix_pubsub": {:hex, :phoenix_pubsub, "1.1.2", "496c303bdf1b2e98a9d26e89af5bba3ab487ba3a3735f74bf1f4064d2a845a3e", [:mix], [], "hexpm", "1f13f9f0f3e769a667a6b6828d29dec37497a082d195cc52dbef401a9b69bf38"},
-  "plug": {:hex, :plug, "1.15.3", "712976f504418f6dff0a3e554c40d705a9bcf89a7ccef92fc6a5ef8f16a30a97", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "cc4365a3c010a56af402e0809208873d113e9c38c401cabd88027ef4f5c01fd2"},
+  "phoenix": {:hex, :phoenix, "1.5.14", "2d5db884be496eefa5157505ec0134e66187cb416c072272420c5509d67bf808", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_html, "~> 2.13 or ~> 3.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.10", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 1.0 or ~> 2.2", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.1.2 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "207f1aa5520320cbb7940d7ff2dde2342162cf513875848f88249ea0ba02fef7"},
+  "phoenix_html": {:hex, :phoenix_html, "2.14.3", "51f720d0d543e4e157ff06b65de38e13303d5778a7919bcc696599e5934271b8", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "efd697a7fff35a13eeeb6b43db884705cba353a1a41d127d118fda5f90c8e80f"},
+  "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.1.3", "3168d78ba41835aecad272d5e8cd51aa87a7ac9eb836eabc42f6e57538e3731d", [:mix], [], "hexpm", "bba06bc1dcfd8cb086759f0edc94a8ba2bc8896d5331a1e2c2902bf8e36ee502"},
+  "plug": {:hex, :plug, "1.16.0", "1d07d50cb9bb05097fdf187b31cf087c7297aafc3fed8299aac79c128a707e47", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "cbf53aa1f5c4d758a7559c0bd6d59e286c2be0c6a1fac8cc3eee2f638243b93e"},
   "plug_cowboy": {:hex, :plug_cowboy, "2.6.2", "753611b23b29231fb916b0cdd96028084b12aff57bfd7b71781bd04b1dbeb5c9", [:mix], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:cowboy_telemetry, "~> 0.3", [hex: :cowboy_telemetry, repo: "hexpm", optional: false]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "951ed2433df22f4c97b85fdb145d4cee561f36b74854d64c06d896d7cd2921a7"},
-  "plug_crypto": {:hex, :plug_crypto, "2.0.0", "77515cc10af06645abbfb5e6ad7a3e9714f805ae118fa1a70205f80d2d70fe73", [:mix], [], "hexpm", "53695bae57cc4e54566d993eb01074e4d894b65a3766f1c43e2c61a1b0f45ea9"},
+  "plug_crypto": {:hex, :plug_crypto, "1.2.5", "918772575e48e81e455818229bf719d4ab4181fcbf7f85b68a35620f78d89ced", [:mix], [], "hexpm", "26549a1d6345e2172eb1c233866756ae44a9609bd33ee6f99147ab3fd87fd842"},
   "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm", "fec8660eb7733ee4117b85f55799fd3833eb769a6df71ccf8903e8dc5447cfce"},
   "poolboy": {:hex, :poolboy, "1.5.2", "392b007a1693a64540cead79830443abf5762f5d30cf50bc95cb2c1aaafa006b", [:rebar3], [], "hexpm", "dad79704ce5440f3d5a3681c8590b9dc25d1a561e8f5a9c995281012860901e3"},
   "postgrex": {:hex, :postgrex, "0.17.4", "5777781f80f53b7c431a001c8dad83ee167bcebcf3a793e3906efff680ab62b3", [:mix], [{:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "6458f7d5b70652bc81c3ea759f91736c16a31be000f306d3c64bcdfe9a18b3cc"},