diff --git a/modules/openapi-generator/src/main/resources/ruby-client/api.mustache b/modules/openapi-generator/src/main/resources/ruby-client/api.mustache
index 84833056569..c92659ff2b1 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/api.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/api.mustache
@@ -3,6 +3,7 @@
 =end
 
 require 'uri'
+require 'cgi'
 
 module {{moduleName}}
 {{#operations}}
@@ -123,7 +124,7 @@ module {{moduleName}}
       {{/hasValidation}}
       {{/allParams}}
       # resource path
-      local_var_path = '{{{path}}}'{{#pathParams}}.sub('{' + '{{baseName}}' + '}', {{paramName}}.to_s){{/pathParams}}
+      local_var_path = '{{{path}}}'{{#pathParams}}.sub('{' + '{{baseName}}' + '}', CGI.escape({{paramName}}.to_s)){{/pathParams}}
 
       # query parameters
       query_params = opts[:query_params] || {}
diff --git a/samples/client/petstore/ruby/lib/petstore/api/another_fake_api.rb b/samples/client/petstore/ruby/lib/petstore/api/another_fake_api.rb
index 2dab233d1eb..18cb328fd9a 100644
--- a/samples/client/petstore/ruby/lib/petstore/api/another_fake_api.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api/another_fake_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class AnotherFakeApi
diff --git a/samples/client/petstore/ruby/lib/petstore/api/fake_api.rb b/samples/client/petstore/ruby/lib/petstore/api/fake_api.rb
index 6017535f5ab..ce59bf605c1 100644
--- a/samples/client/petstore/ruby/lib/petstore/api/fake_api.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api/fake_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class FakeApi
diff --git a/samples/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb b/samples/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb
index b392d965c69..13410aa52de 100644
--- a/samples/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class FakeClassnameTags123Api
diff --git a/samples/client/petstore/ruby/lib/petstore/api/pet_api.rb b/samples/client/petstore/ruby/lib/petstore/api/pet_api.rb
index e6869a8c52c..273affb0542 100644
--- a/samples/client/petstore/ruby/lib/petstore/api/pet_api.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api/pet_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class PetApi
@@ -103,7 +104,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.delete_pet"
       end
       # resource path
-      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -290,7 +291,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.get_pet_by_id"
       end
       # resource path
-      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -414,7 +415,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.update_pet_with_form"
       end
       # resource path
-      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -480,7 +481,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.upload_file"
       end
       # resource path
-      local_var_path = '/pet/{petId}/uploadImage'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}/uploadImage'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -552,7 +553,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'required_file' when calling PetApi.upload_file_with_required_file"
       end
       # resource path
-      local_var_path = '/fake/{petId}/uploadImageWithRequiredFile'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/fake/{petId}/uploadImageWithRequiredFile'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
diff --git a/samples/client/petstore/ruby/lib/petstore/api/store_api.rb b/samples/client/petstore/ruby/lib/petstore/api/store_api.rb
index f506ce63f85..f387db67c5a 100644
--- a/samples/client/petstore/ruby/lib/petstore/api/store_api.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api/store_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class StoreApi
@@ -43,7 +44,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'order_id' when calling StoreApi.delete_order"
       end
       # resource path
-      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', order_id.to_s)
+      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', CGI.escape(order_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -167,7 +168,7 @@ module Petstore
       end
 
       # resource path
-      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', order_id.to_s)
+      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', CGI.escape(order_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
diff --git a/samples/client/petstore/ruby/lib/petstore/api/user_api.rb b/samples/client/petstore/ruby/lib/petstore/api/user_api.rb
index 9c2bf15a5fc..01cb76b6da8 100644
--- a/samples/client/petstore/ruby/lib/petstore/api/user_api.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api/user_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class UserApi
@@ -219,7 +220,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'username' when calling UserApi.delete_user"
       end
       # resource path
-      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', username.to_s)
+      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', CGI.escape(username.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -277,7 +278,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'username' when calling UserApi.get_user_by_name"
       end
       # resource path
-      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', username.to_s)
+      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', CGI.escape(username.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -465,7 +466,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'body' when calling UserApi.update_user"
       end
       # resource path
-      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', username.to_s)
+      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', CGI.escape(username.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/another_fake_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/another_fake_api.rb
index 178ab7d4402..ca03529892a 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/another_fake_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/another_fake_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class AnotherFakeApi
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/default_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/default_api.rb
index 95de16966f2..f944f4a91ad 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/default_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/default_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class DefaultApi
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_api.rb
index c5d1d5426c2..4887add3f1c 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class FakeApi
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb
index d979a7ea373..21a754cec9c 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/fake_classname_tags123_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class FakeClassnameTags123Api
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/pet_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/pet_api.rb
index 37a0aeee289..faeb9c5e761 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/pet_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/pet_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class PetApi
@@ -103,7 +104,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.delete_pet"
       end
       # resource path
-      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -290,7 +291,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.get_pet_by_id"
       end
       # resource path
-      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -414,7 +415,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.update_pet_with_form"
       end
       # resource path
-      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -480,7 +481,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'pet_id' when calling PetApi.upload_file"
       end
       # resource path
-      local_var_path = '/pet/{petId}/uploadImage'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/pet/{petId}/uploadImage'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -552,7 +553,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'required_file' when calling PetApi.upload_file_with_required_file"
       end
       # resource path
-      local_var_path = '/fake/{petId}/uploadImageWithRequiredFile'.sub('{' + 'petId' + '}', pet_id.to_s)
+      local_var_path = '/fake/{petId}/uploadImageWithRequiredFile'.sub('{' + 'petId' + '}', CGI.escape(pet_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/store_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/store_api.rb
index 6d89ff2d514..d846a761f28 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/store_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/store_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class StoreApi
@@ -43,7 +44,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'order_id' when calling StoreApi.delete_order"
       end
       # resource path
-      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', order_id.to_s)
+      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', CGI.escape(order_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -167,7 +168,7 @@ module Petstore
       end
 
       # resource path
-      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', order_id.to_s)
+      local_var_path = '/store/order/{order_id}'.sub('{' + 'order_id' + '}', CGI.escape(order_id.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
diff --git a/samples/openapi3/client/petstore/ruby/lib/petstore/api/user_api.rb b/samples/openapi3/client/petstore/ruby/lib/petstore/api/user_api.rb
index 8ae599d3425..6e50fade18b 100644
--- a/samples/openapi3/client/petstore/ruby/lib/petstore/api/user_api.rb
+++ b/samples/openapi3/client/petstore/ruby/lib/petstore/api/user_api.rb
@@ -11,6 +11,7 @@ OpenAPI Generator version: 4.0.2-SNAPSHOT
 =end
 
 require 'uri'
+require 'cgi'
 
 module Petstore
   class UserApi
@@ -225,7 +226,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'username' when calling UserApi.delete_user"
       end
       # resource path
-      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', username.to_s)
+      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', CGI.escape(username.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -283,7 +284,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'username' when calling UserApi.get_user_by_name"
       end
       # resource path
-      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', username.to_s)
+      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', CGI.escape(username.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}
@@ -471,7 +472,7 @@ module Petstore
         fail ArgumentError, "Missing the required parameter 'user' when calling UserApi.update_user"
       end
       # resource path
-      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', username.to_s)
+      local_var_path = '/user/{username}'.sub('{' + 'username' + '}', CGI.escape(username.to_s))
 
       # query parameters
       query_params = opts[:query_params] || {}