diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 94bb085..331e7a0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,19 +21,13 @@ jobs:
         - ruby: 2.6
           gemfile: gemfiles/activerecord52.gemfile
           elasticsearch: 7.0.0
-        - ruby: 2.5
-          gemfile: gemfiles/activerecord51.gemfile
-          elasticsearch: 6.8.23
-        - ruby: 2.4
-          gemfile: gemfiles/activerecord50.gemfile
-          elasticsearch: 6.0.0
         - ruby: 2.7
           gemfile: gemfiles/mongoid7.gemfile
           elasticsearch: 7
           mongodb: true
         - ruby: 2.6
           gemfile: gemfiles/mongoid6.gemfile
-          elasticsearch: 6
+          elasticsearch: 7
           mongodb: true
     runs-on: ubuntu-latest
     env:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ac2edf..dc44329 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 5.0.0 (unreleased)
+
+- Dropped support for Ruby < 2.6 and Active Record < 5.2
+
 ## 4.6.3 (2021-11-19)
 
 - Added support for reloadable synonyms for OpenSearch
diff --git a/gemfiles/activerecord50.gemfile b/gemfiles/activerecord50.gemfile
deleted file mode 100644
index 3c172a3..0000000
--- a/gemfiles/activerecord50.gemfile
+++ /dev/null
@@ -1,15 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: ".."
-
-gem "rake"
-gem "minitest", ">= 5"
-gem "sqlite3", "~> 1.3.0"
-gem "activerecord", "~> 5.0.0"
-gem "actionpack", "~> 5.0.0"
-gem "activejob", "~> 5.0.0", require: "active_job"
-gem "elasticsearch", "~> 6"
-gem "redis"
-gem "connection_pool"
-gem "kaminari"
-gem "gemoji-parser"
diff --git a/gemfiles/activerecord51.gemfile b/gemfiles/activerecord51.gemfile
deleted file mode 100644
index 0e95930..0000000
--- a/gemfiles/activerecord51.gemfile
+++ /dev/null
@@ -1,15 +0,0 @@
-source "https://rubygems.org"
-
-gemspec path: ".."
-
-gem "rake"
-gem "minitest", ">= 5"
-gem "sqlite3"
-gem "activerecord", "~> 5.1.0"
-gem "actionpack", "~> 5.1.0"
-gem "activejob", "~> 5.1.0", require: "active_job"
-gem "elasticsearch", "~> 6"
-gem "redis"
-gem "connection_pool"
-gem "kaminari"
-gem "gemoji-parser"
diff --git a/searchkick.gemspec b/searchkick.gemspec
index b1b9600..f957a0e 100644
--- a/searchkick.gemspec
+++ b/searchkick.gemspec
@@ -13,9 +13,9 @@ Gem::Specification.new do |spec|
   spec.files         = Dir["*.{md,txt}", "{lib}/**/*"]
   spec.require_path  = "lib"
 
-  spec.required_ruby_version = ">= 2.4"
+  spec.required_ruby_version = ">= 2.6"
 
-  spec.add_dependency "activemodel", ">= 5"
+  spec.add_dependency "activemodel", ">= 5.2"
   spec.add_dependency "elasticsearch", ">= 6", "< 7.14"
   spec.add_dependency "hashie"
 end
--
libgit2 0.21.0