diff --git a/.ruby-version b/.ruby-version
index 944880fa..49cdd668 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2.0
+2.7.6
diff --git a/Dockerfile b/Dockerfile
index 27e70b39..3c43e2d8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.2.0
+FROM ruby:2.7.6
 
 WORKDIR /srv/app/datagovuk_find
 
diff --git a/Gemfile b/Gemfile
index 8996eeaa..eb9f54e2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,7 +17,7 @@ gem "govuk_publishing_components"
 gem "htmlentities"
 gem "jbuilder"
 gem "jquery-rails"
-gem "kaminari"
+gem "kaminari", "< 1.2" # do not upgrade this unless elasticsearch is also upgraded
 gem "lograge"
 gem "logstash-event"
 gem "mime-types"
diff --git a/Gemfile.lock b/Gemfile.lock
index 592a0656..3aea88c0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -67,7 +67,7 @@ GEM
       debug_inspector (>= 0.0.1)
     bootsnap (1.10.3)
       msgpack (~> 1.2)
-    brakeman (5.4.1)
+    brakeman (5.2.1)
     browser (5.3.1)
     builder (3.2.4)
     byebug (11.1.3)
@@ -86,7 +86,6 @@ GEM
     crack (0.4.5)
       rexml
     crass (1.0.6)
-    date (3.3.3)
     debug_inspector (1.1.0)
     diff-lcs (1.5.0)
     docile (1.4.0)
@@ -137,33 +136,30 @@ GEM
     ffi (1.15.5)
     globalid (1.0.0)
       activesupport (>= 5.0)
-    govuk_app_config (5.1.0)
-      logstasher (~> 2.1)
-      plek (>= 4, < 6)
-      prometheus_exporter (~> 2.0)
-      puma (>= 5.6, < 7.0)
-      rack-proxy (~> 0.7)
-      sentry-rails (~> 5.3)
-      sentry-ruby (~> 5.3)
-      statsd-ruby (~> 1.5)
-      unicorn (~> 6.1)
+    govuk_app_config (4.3.0)
+      logstasher (>= 1.2.2, < 2.2.0)
+      puma (~> 5.0)
+      sentry-rails (~> 4.5.0)
+      sentry-ruby (~> 4.5.0)
+      statsd-ruby (~> 1.5.0)
+      unicorn (>= 5.4, < 5.9)
     govuk_elements_rails (3.1.3)
       govuk_frontend_toolkit (>= 6.0.2)
       rails (>= 4.1.0)
       sass (>= 3.2.0)
     govuk_frontend_toolkit (9.0.1)
       railties (>= 3.1.0)
-    govuk_personalisation (0.13.0)
+    govuk_personalisation (0.11.2)
       plek (>= 1.9.0)
       rails (>= 6, < 8)
-    govuk_publishing_components (35.0.0)
+    govuk_publishing_components (28.6.0)
       govuk_app_config
       govuk_personalisation (>= 0.7.0)
       kramdown
       plek
-      rails (>= 6)
+      rails (~> 6)
       rouge
-      sprockets (>= 3)
+      sprockets (< 4)
     govuk_test (2.3.0)
       brakeman (>= 5.0.2)
       capybara
@@ -187,20 +183,20 @@ GEM
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     json (2.6.2)
-    kaminari (1.2.2)
+    kaminari (1.1.1)
       activesupport (>= 4.1.0)
-      kaminari-actionview (= 1.2.2)
-      kaminari-activerecord (= 1.2.2)
-      kaminari-core (= 1.2.2)
-    kaminari-actionview (1.2.2)
+      kaminari-actionview (= 1.1.1)
+      kaminari-activerecord (= 1.1.1)
+      kaminari-core (= 1.1.1)
+    kaminari-actionview (1.1.1)
       actionview
-      kaminari-core (= 1.2.2)
-    kaminari-activerecord (1.2.2)
+      kaminari-core (= 1.1.1)
+    kaminari-activerecord (1.1.1)
       activerecord
-      kaminari-core (= 1.2.2)
-    kaminari-core (1.2.2)
+      kaminari-core (= 1.1.1)
+    kaminari-core (1.1.1)
     kgio (2.11.4)
-    kramdown (2.4.0)
+    kramdown (2.3.1)
       rexml
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -217,11 +213,8 @@ GEM
     loofah (2.18.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    mail (2.8.1)
+    mail (2.7.1)
       mini_mime (>= 0.1.1)
-      net-imap
-      net-pop
-      net-smtp
     marcel (1.0.2)
     matrix (0.4.2)
     method_source (1.0.0)
@@ -234,18 +227,9 @@ GEM
     msgpack (1.4.5)
     multi_json (1.15.0)
     multipart-post (2.1.1)
-    net-imap (0.3.4)
-      date
-      net-protocol
-    net-pop (0.1.2)
-      net-protocol
-    net-protocol (0.2.1)
-      timeout
-    net-smtp (0.3.3)
-      net-protocol
     netrc (0.11.0)
     nio4r (2.5.8)
-    nokogiri (1.14.2)
+    nokogiri (1.13.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     parallel (1.22.1)
@@ -253,9 +237,7 @@ GEM
       ast (~> 2.4.1)
     parslet (2.0.0)
     pg (1.3.2)
-    plek (5.0.0)
-    prometheus_exporter (2.0.8)
-      webrick
+    plek (4.0.0)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -270,8 +252,6 @@ GEM
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.4)
-    rack-proxy (0.7.6)
-      rack
     rack-test (2.0.2)
       rack (>= 1.3)
     rails (6.1.6.1)
@@ -301,7 +281,7 @@ GEM
       rake (>= 12.2)
       thor (~> 1.0)
     rainbow (3.1.1)
-    raindrops (0.20.1)
+    raindrops (0.20.0)
     rake (13.0.6)
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
@@ -316,7 +296,7 @@ GEM
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
     rexml (3.2.5)
-    rouge (4.1.0)
+    rouge (3.28.0)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -387,13 +367,18 @@ GEM
       childprocess (>= 0.5, < 5.0)
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2)
-    sentry-rails (5.8.0)
+    sentry-rails (4.5.2)
       railties (>= 5.0)
-      sentry-ruby (~> 5.8.0)
+      sentry-ruby-core (~> 4.5.0)
     sentry-raven (3.1.2)
       faraday (>= 1.0)
-    sentry-ruby (5.8.0)
+    sentry-ruby (4.5.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
+      faraday (>= 1.0)
+      sentry-ruby-core (= 4.5.2)
+    sentry-ruby-core (4.5.2)
+      concurrent-ruby
+      faraday
     simplecov (0.17.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
@@ -415,7 +400,6 @@ GEM
     statsd-ruby (1.5.0)
     thor (1.2.1)
     tilt (2.0.10)
-    timeout (0.3.2)
     tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
     uglifier (4.2.0)
@@ -424,7 +408,7 @@ GEM
       unf_ext
     unf_ext (0.0.8)
     unicode-display_width (2.2.0)
-    unicorn (6.1.0)
+    unicorn (5.8.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
     webdrivers (5.0.0)
@@ -435,7 +419,6 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webrick (1.8.1)
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
@@ -471,7 +454,7 @@ DEPENDENCIES
   htmlentities
   jbuilder
   jquery-rails
-  kaminari
+  kaminari (< 1.2)
   lograge
   logstash-event
   mime-types
@@ -500,7 +483,7 @@ DEPENDENCIES
   zendesk_api
 
 RUBY VERSION
-   ruby 3.2.0p0
+   ruby 2.7.6p219
 
 BUNDLED WITH
    2.1.4
diff --git a/app/controllers/legacy/search_controller.rb b/app/controllers/legacy/search_controller.rb
index bbb325ea..84b77853 100644
--- a/app/controllers/legacy/search_controller.rb
+++ b/app/controllers/legacy/search_controller.rb
@@ -6,7 +6,7 @@ def redirect
       licence: licence_param,
     }.compact
 
-    redirect_to search_path(q: params["q"], filters:)
+    redirect_to search_path(q: params["q"], filters: filters)
   end
 
 private
diff --git a/app/models/datafile.rb b/app/models/datafile.rb
index 968ebafd..1ddf2b19 100644
--- a/app/models/datafile.rb
+++ b/app/models/datafile.rb
@@ -46,6 +46,6 @@ def wfs?
   end
 
   def preview
-    @preview ||= Preview.new(url:, format:)
+    @preview ||= Preview.new(url: url, format: format)
   end
 end
diff --git a/app/services/search/query.rb b/app/services/search/query.rb
index b1a6cee4..d30376af 100644
--- a/app/services/search/query.rb
+++ b/app/services/search/query.rb
@@ -185,7 +185,7 @@ def self.by_legacy_name(legacy_name)
         query: {
           constant_score: {
             filter: {
-              term: { legacy_name: },
+              term: { legacy_name: legacy_name },
             },
           },
         },
@@ -197,7 +197,7 @@ def self.by_uuid(uuid)
         query: {
           constant_score: {
             filter: {
-              term: { uuid: },
+              term: { uuid: uuid },
             },
           },
         },
@@ -285,7 +285,7 @@ def self.organisation_category_filter(organisation_category, boost: 2)
             term: {
               "organisation.category.keyword" => {
                 value: organisation_category,
-                boost:,
+                boost: boost,
               },
             },
           },
@@ -302,7 +302,7 @@ def self.organisation_title_filter(organisation_title, boost: 2)
               "organisation.title.english" => {
                 query: organisation_title,
                 analyzer: "english",
-                boost:,
+                boost: boost,
               },
             },
           },
diff --git a/config/brakeman.ignore b/config/brakeman.ignore
new file mode 100644
index 00000000..ac810562
--- /dev/null
+++ b/config/brakeman.ignore
@@ -0,0 +1,22 @@
+{
+  "ignored_warnings": [
+    {
+      "warning_type": "Unmaintained Dependency",
+      "warning_code": 123,
+      "fingerprint": "870fa4a5cfd770898e1b7a159368b4210fe366634512563f9fb1c1cbbfef1d78",
+      "check_name": "EOLRuby",
+      "message": "Support for Ruby 2.7.6 ends on 2023-03-31",
+      "file": "Gemfile.lock",
+      "line": 257,
+      "link": "https://brakemanscanner.org/docs/warning_types/unmaintained_dependency/",
+      "code": null,
+      "render_path": null,
+      "location": null,
+      "user_input": null,
+      "confidence": "Medium",
+      "note": "CI won't pass with this warning enabled, preventing us from deploying"
+    }
+  ],
+  "updated": "2023-03-21 15:53:39 +0000",
+  "brakeman_version": "5.2.1"
+}
diff --git a/config/initializers/elasticsearch.rb b/config/initializers/elasticsearch.rb
index ba59c7c5..1a2e71b7 100644
--- a/config/initializers/elasticsearch.rb
+++ b/config/initializers/elasticsearch.rb
@@ -10,7 +10,7 @@
 raise StandardError, "No opensearch environment variables found" if host.blank?
 
 Elasticsearch::Model.client = Elasticsearch::Client.new(
-  host:,
+  host: host,
   transport_options: {
     request: {
       timeout: es_config.fetch(:elastic_timeout),
diff --git a/spec/services/search/phrase_clause_spec.rb b/spec/services/search/phrase_clause_spec.rb
index 4ead4e6a..e65d738e 100644
--- a/spec/services/search/phrase_clause_spec.rb
+++ b/spec/services/search/phrase_clause_spec.rb
@@ -5,5 +5,5 @@
 
   let(:phrase) { double }
 
-  it { is_expected.to have_attributes(phrase:) }
+  it { is_expected.to have_attributes(phrase: phrase) }
 end
diff --git a/spec/services/search/terms_clause_spec.rb b/spec/services/search/terms_clause_spec.rb
index ae8604b2..72e9cee7 100644
--- a/spec/services/search/terms_clause_spec.rb
+++ b/spec/services/search/terms_clause_spec.rb
@@ -5,5 +5,5 @@
 
   let(:terms) { double }
 
-  it { is_expected.to have_attributes(terms:) }
+  it { is_expected.to have_attributes(terms: terms) }
 end