diff --git a/README.md b/README.md
index b0f22172f..13f9c7bba 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ gem 'mobility', '~> 1.3.0.rc3'
 ### ActiveRecord (Rails)
 
 Requirements:
-- ActiveRecord >= 6.1
+- ActiveRecord >= 7.0
 
 To translate attributes on a model, extend `Mobility`, then call `translates`
 passing in one or more attributes as well as a hash of options (see below).
diff --git a/lib/mobility/backends/active_record/container.rb b/lib/mobility/backends/active_record/container.rb
index 83ca63984..5f1454021 100644
--- a/lib/mobility/backends/active_record/container.rb
+++ b/lib/mobility/backends/active_record/container.rb
@@ -86,25 +86,6 @@ def each_locale
         end
       end
 
-      setup do |_attributes, options|
-        # Fix for duping depth-2 jsonb column in AR < 5.0
-        if ::ActiveRecord::VERSION::STRING < '5.0'
-          column_name = options[:column_name]
-          module_name = "MobilityArContainer#{column_name.to_s.camelcase}"
-          unless const_defined?(module_name)
-            dupable = Module.new do
-              class_eval <<-EOM, __FILE__, __LINE__ + 1
-                def initialize_dup(source)
-                  super
-                  self.#{column_name} = source.#{column_name}.deep_dup
-                end
-              EOM
-            end
-            include const_set(module_name, dupable)
-          end
-        end
-      end
-
       private
 
       def model_translations(locale)
diff --git a/lib/mobility/plugins/active_record/dirty.rb b/lib/mobility/plugins/active_record/dirty.rb
index 3d2ae0711..93cec5ea4 100644
--- a/lib/mobility/plugins/active_record/dirty.rb
+++ b/lib/mobility/plugins/active_record/dirty.rb
@@ -79,28 +79,24 @@ def self.after_update; end
         )
 
         module InstanceMethods
-          if ::ActiveRecord::VERSION::STRING >= '5.1' # define patterns added in 5.1
-            def saved_changes
-              super.merge(mutations_from_mobility.previous_changes)
-            end
+          def saved_changes
+            super.merge(mutations_from_mobility.previous_changes)
+          end
 
-            def changes_to_save
-              super.merge(mutations_from_mobility.changes)
-            end
+          def changes_to_save
+            super.merge(mutations_from_mobility.changes)
+          end
 
-            def changed_attribute_names_to_save
-              super + mutations_from_mobility.changed
-            end
+          def changed_attribute_names_to_save
+            super + mutations_from_mobility.changed
+          end
 
-            def attributes_in_database
-              super.merge(mutations_from_mobility.changed_attributes)
-            end
+          def attributes_in_database
+            super.merge(mutations_from_mobility.changed_attributes)
+          end
 
-            if ::ActiveRecord::VERSION::STRING >= '6.0'
-              def has_changes_to_save?
-                super || mutations_from_mobility.changed?
-              end
-            end
+          def has_changes_to_save?
+            super || mutations_from_mobility.changed?
           end
 
           def reload(*)
diff --git a/lib/mobility/plugins/active_record/query.rb b/lib/mobility/plugins/active_record/query.rb
index f21d59e8b..813ffbbef 100644
--- a/lib/mobility/plugins/active_record/query.rb
+++ b/lib/mobility/plugins/active_record/query.rb
@@ -158,29 +158,27 @@ def order(opts, *rest)
             end
           end
 
-          if ::ActiveRecord::VERSION::STRING >= '5.0'
-            %w[pluck group select].each do |method_name|
-              define_method method_name do |*attrs, &block|
-                return super(*attrs, &block) if (method_name == 'select' && block.present?)
+          %w[pluck group select].each do |method_name|
+            define_method method_name do |*attrs, &block|
+              return super(*attrs, &block) if (method_name == 'select' && block.present?)
 
-                return super(*attrs, &block) unless klass.respond_to?(:mobility_attribute?)
+              return super(*attrs, &block) unless klass.respond_to?(:mobility_attribute?)
 
-                return super(*attrs, &block) unless attrs.any?(&klass.method(:mobility_attribute?))
+              return super(*attrs, &block) unless attrs.any?(&klass.method(:mobility_attribute?))
 
-                keys = attrs.dup
+              keys = attrs.dup
 
-                base = keys.each_with_index.inject(self) do |query, (key, index)|
-                  next query unless klass.mobility_attribute?(key)
-                  keys[index] = backend_node(key)
-                  if method_name == "select" && query.order_values.any?
-                    keys[index] = keys[index]
-                      .as(::Mobility::Plugins::ActiveRecord::Query.attribute_alias(key.to_s))
-                  end
-                  klass.mobility_backend_class(key).apply_scope(query, backend_node(key))
+              base = keys.each_with_index.inject(self) do |query, (key, index)|
+                next query unless klass.mobility_attribute?(key)
+                keys[index] = backend_node(key)
+                if method_name == "select" && query.order_values.any?
+                  keys[index] = keys[index]
+                    .as(::Mobility::Plugins::ActiveRecord::Query.attribute_alias(key.to_s))
                 end
-
-                base.public_send(method_name, *keys, &block)
+                klass.mobility_backend_class(key).apply_scope(query, backend_node(key))
               end
+
+              base.public_send(method_name, *keys, &block)
             end
           end
 
diff --git a/lib/mobility/plugins/arel/nodes/pg_ops.rb b/lib/mobility/plugins/arel/nodes/pg_ops.rb
index 14481b883..9f6e8b3fb 100644
--- a/lib/mobility/plugins/arel/nodes/pg_ops.rb
+++ b/lib/mobility/plugins/arel/nodes/pg_ops.rb
@@ -26,17 +26,6 @@ def lower
           end)
         end
 
-        # Needed for AR 4.2, can be removed when support is deprecated
-        if ::ActiveRecord::VERSION::STRING < '5.0'
-          [JsonbDashDoubleArrow, HstoreDashArrow].each do |klass|
-            klass.class_eval do
-              def quoted_node other
-                other && super
-              end
-            end
-          end
-        end
-
         class Jsonb  < JsonbDashDoubleArrow
           def to_dash_arrow
             JsonbDashArrow.new left, right
diff --git a/spec/integration/active_record_compatibility_spec.rb b/spec/integration/active_record_compatibility_spec.rb
index e87053aea..0f4e4b6af 100644
--- a/spec/integration/active_record_compatibility_spec.rb
+++ b/spec/integration/active_record_compatibility_spec.rb
@@ -50,7 +50,7 @@
       expect(Post.first.title).to eq("association changed value")
     end
 
-    it "resets cache when model is reloaded", active_record_geq: '5.0' do
+    it "resets cache when model is reloaded" do
       expect(post.mobility_backends[:title]).to receive(:clear_cache).once
       post.reload
     end
diff --git a/spec/mobility/backends/active_record/container_spec.rb b/spec/mobility/backends/active_record/container_spec.rb
index c62d3c665..00e501f7b 100644
--- a/spec/mobility/backends/active_record/container_spec.rb
+++ b/spec/mobility/backends/active_record/container_spec.rb
@@ -71,7 +71,7 @@
     end
 
     describe "non-text values" do
-      it "stores non-string types as-is when saving", active_record_geq: '5.0' do
+      it "stores non-string types as-is when saving" do
         post = ContainerPost.new
         backend = post.mobility_backends[:title]
         backend.write(:en, { foo: :bar } )
diff --git a/spec/mobility/backends/active_record/json_spec.rb b/spec/mobility/backends/active_record/json_spec.rb
index 4762758ee..aaaed85c7 100644
--- a/spec/mobility/backends/active_record/json_spec.rb
+++ b/spec/mobility/backends/active_record/json_spec.rb
@@ -35,7 +35,7 @@
     end
 
     describe "non-text values" do
-      it "stores non-string types as-is when saving", active_record_geq: '5.0' do
+      it "stores non-string types as-is when saving" do
         backend = post.mobility_backends[:title]
         backend.write(:en, { foo: :bar } )
         post.save
diff --git a/spec/mobility/backends/active_record/jsonb_spec.rb b/spec/mobility/backends/active_record/jsonb_spec.rb
index 06d3d4b73..02d5909c2 100644
--- a/spec/mobility/backends/active_record/jsonb_spec.rb
+++ b/spec/mobility/backends/active_record/jsonb_spec.rb
@@ -54,7 +54,7 @@
     end
 
     describe "non-text values" do
-      it "stores non-string types as-is when saving", active_record_geq: '5.0' do
+      it "stores non-string types as-is when saving" do
         backend = post.mobility_backends[:title]
         backend.write(:en, { foo: :bar } )
         post.save
@@ -103,8 +103,5 @@
 
     include_accessor_examples 'JsonbPost'
     include_serialization_examples 'JsonbPost', column_affix: column_affix
-
-    # regression for https://github.com/shioyama/mobility/issues/308
-    include_querying_examples 'JsonbPost' if ActiveRecord::VERSION::STRING == '5.1'
   end
 end
diff --git a/spec/mobility/backends/active_record/serialized_spec.rb b/spec/mobility/backends/active_record/serialized_spec.rb
index 908fee6e7..84f51b8be 100644
--- a/spec/mobility/backends/active_record/serialized_spec.rb
+++ b/spec/mobility/backends/active_record/serialized_spec.rb
@@ -27,7 +27,7 @@
         include_cache_key_examples 'SerializedPost'
 
         describe "non-text values" do
-          it "converts non-string types to strings when saving", active_record_geq: '5.0' do
+          it "converts non-string types to strings when saving" do
             post = SerializedPost.new
             backend = post.mobility_backends[:title]
             backend.write(:en, { foo: :bar } )
diff --git a/spec/mobility/plugins/active_model/dirty_spec.rb b/spec/mobility/plugins/active_model/dirty_spec.rb
index bf733667a..98a459a2f 100644
--- a/spec/mobility/plugins/active_model/dirty_spec.rb
+++ b/spec/mobility/plugins/active_model/dirty_spec.rb
@@ -263,7 +263,7 @@ def save
 
     # This is a regression spec to ensure we don't change the scope of
     # ActiveModel handler methods.
-    it 'does not change private status of attribute handler methods', active_record_geq: '5.0' do
+    it 'does not change private status of attribute handler methods' do
       expect(instance.respond_to?(:attribute_change)).to eq(false)
       expect(instance.respond_to?(:attribute_change, true)).to eq(true)
       expect(instance.respond_to?(:attribute_previous_change)).to eq(false)
@@ -284,7 +284,7 @@ def save
       end
     end
 
-    it "returns changes on attribute for current locale", active_record_geq: '5.0' do
+    it "returns changes on attribute for current locale" do
       Mobility.locale = locale = :en
       backend.write(locale, 'foo')
       instance.save
diff --git a/spec/mobility/plugins/active_record/dirty_spec.rb b/spec/mobility/plugins/active_record/dirty_spec.rb
index 52d3381bf..cbef87905 100644
--- a/spec/mobility/plugins/active_record/dirty_spec.rb
+++ b/spec/mobility/plugins/active_record/dirty_spec.rb
@@ -18,10 +18,8 @@
     stub_const 'Article', Class.new(ActiveRecord::Base)
     Article.include translations
 
-    # ensure we include these methods as a module rather than override in class
-    changes_applied_method = ::ActiveRecord::VERSION::STRING < '5.1' ? :changes_applied : :changes_internally_applied
     Article.class_eval do
-      define_method changes_applied_method do
+      define_method :changes_internally_applied do
         super()
       end
 
@@ -429,7 +427,7 @@ def self.after_update; end
     it_behaves_like "resets on model action", :reload
   end
 
-  describe "#saved_changes", active_record_geq: '5.1' do
+  describe "#saved_changes" do
     it "includes translated and untranslated attributes" do
       instance = model_class.create
 
@@ -448,7 +446,7 @@ def self.after_update; end
     end
   end
 
-  describe '#changes_to_save', active_record_geq: '5.1' do
+  describe '#changes_to_save' do
     it "includes translated and untranslated attributes" do
       instance = model_class.new
 
@@ -464,7 +462,7 @@ def self.after_update; end
     end
   end
 
-  describe '#has_changes_to_save?', active_record_geq: '6.0' do
+  describe '#has_changes_to_save?' do
     it 'detects changes to translated and untranslated attributes' do
       instance = model_class.new
       backend = backend_for(instance, :title)
@@ -480,7 +478,7 @@ def self.after_update; end
     end
   end
 
-  describe '#attributes_in_database', active_record_geq: '6.0' do
+  describe '#attributes_in_database' do
     it 'includes translated and untranslated attributes' do
       instance = model_class.create
       expect(instance.attributes_in_database).to eq({})
@@ -502,7 +500,7 @@ def self.after_update; end
     end
   end
 
-  describe '#changed_attribute_names_to_save', active_record_geq: '5.1' do
+  describe '#changed_attribute_names_to_save' do
     it 'includes translated attributes and untranslated attributes' do
       instance = model_class.new
       backend = backend_for(instance, :title)
diff --git a/spec/support/shared_examples/querying_examples.rb b/spec/support/shared_examples/querying_examples.rb
index a404af76a..fd58878d4 100644
--- a/spec/support/shared_examples/querying_examples.rb
+++ b/spec/support/shared_examples/querying_examples.rb
@@ -287,7 +287,7 @@
     end
   end
 
-  describe ".pluck", active_record_geq: '5.0' do
+  describe ".pluck" do
     before do
       [["foo0", "bar3", true],
        ["foo2", "bar0", false],
@@ -341,7 +341,7 @@
     end
   end
 
-  describe ".select/.group", active_record_geq: '5.0' do
+  describe ".select/.group" do
     before do
       [["foo", "baz", true],
        ["foo", "baz", false],
@@ -555,7 +555,7 @@ def query(*args, **kwargs, &block); model_class.i18n(*args, **kwargs, &block); e
           expect(query { __send__(a1).matches("%foo") }).to match_array([i[0], *i[5..6], barfoo])
         end
 
-        if ENV['DB'] == 'postgres' && ::ActiveRecord::VERSION::STRING >= '5.0'
+        if ENV['DB'] == 'postgres'
           it "works with case_sensitive option" do
             foobar = model_class.create(a1 => "foObar")
             barfoo = model_class.create(a1 => "barfOo")