diff --git a/.gitlab/ci/rails.gitlab-ci.yml b/.gitlab/ci/rails.gitlab-ci.yml
index 06ea9410c0a1d47c6c24328f29a19bbc205754fb..c89dc0ab13f74ae8695c7fe0e31c5c171bc1ec1f 100644
--- a/.gitlab/ci/rails.gitlab-ci.yml
+++ b/.gitlab/ci/rails.gitlab-ci.yml
@@ -8,7 +8,7 @@
 
 .minimal-bundle-install:
   script:
-    - export BUNDLE_WITHOUT="${BUNDLE_WITHOUT}:default:test:puma:unicorn:kerberos:metrics:omnibus:ed25519"
+    - export BUNDLE_WITHOUT="${BUNDLE_WITHOUT}:default:test:puma:kerberos:metrics:omnibus:ed25519"
     - bundle_install_script
 
 .base-script:
diff --git a/Gemfile b/Gemfile
index 67cb2aa6496be8ed867fe65f5dc021c667d4531b..e97348f17e88e1aacda464e234f59e700387815a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -183,10 +183,6 @@ gem 'rack', '~> 2.2.3'
 # https://github.com/sharpstone/rack-timeout/blob/master/README.md#rails-apps-manually
 gem 'rack-timeout', '~> 0.5.1', require: 'rack/timeout/base'
 
-group :unicorn do
-  gem 'unicorn', '~> 5.5'
-end
-
 group :puma do
   gem 'puma', '~> 5.3.1', require: false
   gem 'puma_worker_killer', '~> 0.3.1', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 6e5f7edfd736f9eb4cc46c24f609a452a4231f1f..59cbd84a3e60815096c40b2cf6383f47078f2971 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -682,7 +682,6 @@ GEM
       activerecord
       kaminari-core (= 1.2.1)
     kaminari-core (1.2.1)
-    kgio (2.11.3)
     knapsack (1.21.1)
       rake
     kramdown (2.3.1)
@@ -1001,7 +1000,6 @@ GEM
       rake (>= 0.8.7)
       thor (~> 1.0)
     rainbow (3.0.0)
-    raindrops (0.19.1)
     rake (13.0.3)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
@@ -1319,9 +1317,6 @@ GEM
     unf_ext (0.0.7.7)
     unicode-display_width (1.7.0)
     unicode_utils (1.4.0)
-    unicorn (5.5.5)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
     uniform_notifier (1.13.0)
     unleash (0.1.5)
       murmurhash3 (~> 0.1.6)
@@ -1653,7 +1648,6 @@ DEPENDENCIES
   truncato (~> 0.7.11)
   u2f (~> 0.2.1)
   unf (~> 0.1.4)
-  unicorn (~> 5.5)
   unleash (~> 0.1.5)
   valid_email (~> 0.1)
   validates_hostname (~> 1.0.11)
diff --git a/config/dependency_decisions.yml b/config/dependency_decisions.yml
index d76dd8fe25b82236ced518ca0e852cef4c55c762..573286a4c112a03f5e4674c3c5a6460250cc76c1 100644
--- a/config/dependency_decisions.yml
+++ b/config/dependency_decisions.yml
@@ -123,13 +123,6 @@
     :why: https://github.com/minad/creole#license
     :versions: []
     :when: 2016-04-17 21:49:10.329759000 Z
-- - :license
-  - unicorn
-  - ruby
-  - :who: Connor Shea
-    :why: http://unicorn.bogomips.org/LICENSE.html
-    :versions: []
-    :when: 2016-05-02 05:45:28.817510000 Z
 - - :license
   - unf
   - BSD