diff --git a/docs/generators/ruby.md b/docs/generators/ruby.md
index c3cd707dd0b1..59a8a701ef19 100644
--- a/docs/generators/ruby.md
+++ b/docs/generators/ruby.md
@@ -29,7 +29,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |gemLicense|gem license. | |unlicense|
 |gemMetadata|gem metadata.| |{}|
 |gemName|gem name (convention: underscore_case).| |openapi_client|
-|gemRequiredRubyVersion|gem required Ruby version. | |>= 2.4|
+|gemRequiredRubyVersion|gem required Ruby version. | |>= 2.7|
 |gemSummary|gem summary. | |A ruby wrapper for the REST APIs|
 |gemVersion|gem version.| |1.0.0|
 |hideGenerationTimestamp|Hides the generation timestamp when files are generated.| |true|
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
index 6a3481fad6f4..d4b5e3a8b8a3 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
@@ -69,7 +69,7 @@ public class RubyClientCodegen extends AbstractRubyCodegen {
     protected String specFolder = "spec";
     protected String libFolder = "lib";
     @Setter protected String gemLicense = "unlicense";
-    @Setter protected String gemRequiredRubyVersion = ">= 1.9";
+    @Setter protected String gemRequiredRubyVersion = ">= 2.7";
     @Setter protected String gemHomepage = "https://openapitools.org";
     @Setter protected String gemSummary = "A Ruby SDK for the REST API";
     @Setter protected String gemDescription = "This gem maps to a REST API";
@@ -164,7 +164,7 @@ public RubyClientCodegen() {
                 defaultValue("unlicense"));
 
         cliOptions.add(new CliOption(GEM_REQUIRED_RUBY_VERSION, "gem required Ruby version. ").
-                defaultValue(">= 2.4"));
+                defaultValue(">= 2.7"));
 
         cliOptions.add(new CliOption(GEM_HOMEPAGE, "gem homepage. ").
                 defaultValue("https://openapi-generator.tech"));
diff --git a/modules/openapi-generator/src/main/resources/ruby-client/rubocop.mustache b/modules/openapi-generator/src/main/resources/ruby-client/rubocop.mustache
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/rubocop.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/rubocop.mustache
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/echo_api/ruby-faraday/.rubocop.yml b/samples/client/echo_api/ruby-faraday/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/echo_api/ruby-faraday/.rubocop.yml
+++ b/samples/client/echo_api/ruby-faraday/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/echo_api/ruby-httpx/.rubocop.yml b/samples/client/echo_api/ruby-httpx/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/echo_api/ruby-httpx/.rubocop.yml
+++ b/samples/client/echo_api/ruby-httpx/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/echo_api/ruby-typhoeus/.rubocop.yml b/samples/client/echo_api/ruby-typhoeus/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/echo_api/ruby-typhoeus/.rubocop.yml
+++ b/samples/client/echo_api/ruby-typhoeus/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/petstore/ruby-autoload/.rubocop.yml b/samples/client/petstore/ruby-autoload/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/petstore/ruby-autoload/.rubocop.yml
+++ b/samples/client/petstore/ruby-autoload/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/petstore/ruby-faraday/.rubocop.yml b/samples/client/petstore/ruby-faraday/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/petstore/ruby-faraday/.rubocop.yml
+++ b/samples/client/petstore/ruby-faraday/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/petstore/ruby-httpx/.rubocop.yml b/samples/client/petstore/ruby-httpx/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/petstore/ruby-httpx/.rubocop.yml
+++ b/samples/client/petstore/ruby-httpx/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/client/petstore/ruby/.rubocop.yml b/samples/client/petstore/ruby/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/client/petstore/ruby/.rubocop.yml
+++ b/samples/client/petstore/ruby/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/.rubocop.yml b/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/.rubocop.yml
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/openapi3/client/features/dynamic-servers/ruby/.rubocop.yml b/samples/openapi3/client/features/dynamic-servers/ruby/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/openapi3/client/features/dynamic-servers/ruby/.rubocop.yml
+++ b/samples/openapi3/client/features/dynamic-servers/ruby/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true
diff --git a/samples/openapi3/client/features/generate-alias-as-model/ruby-client/.rubocop.yml b/samples/openapi3/client/features/generate-alias-as-model/ruby-client/.rubocop.yml
index d32b2b1cdab5..3401cf2d0de2 100644
--- a/samples/openapi3/client/features/generate-alias-as-model/ruby-client/.rubocop.yml
+++ b/samples/openapi3/client/features/generate-alias-as-model/ruby-client/.rubocop.yml
@@ -1,7 +1,7 @@
 # This file is based on https://github.com/rails/rails/blob/master/.rubocop.yml (MIT license)
 # Automatically generated by OpenAPI Generator (https://openapi-generator.tech)
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.7
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true