diff --git a/.travis.yml b/.travis.yml
index a50fc73..54a0a14 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,2 +1,9 @@
 import:
-- logstash-plugins/.ci:travis/travis.yml@1.x
\ No newline at end of file
+  - logstash-plugins/.ci:travis/defaults.yml@1.x
+  - logstash-plugins/.ci:travis/exec.yml@1.x
+
+env:
+  jobs:
+    # lock on version 8.x because use Ruby 2.6.0 available from 8.4.0
+    - ELASTIC_STACK_VERSION=8.x DOCKER_ENV=dockerjdk17.env
+    - SNAPSHOT=true ELASTIC_STACK_VERSION=8.x DOCKER_ENV=dockerjdk17.env
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a730d1..1730584 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 4.2.0
+  - Update Nokogiri dependency version [#78](https://github.com/logstash-plugins/logstash-filter-xml/pull/78)
+
 ## 4.1.3
   - [DOC] Updated URL for current xsl reference docs [#70](https://github.com/logstash-plugins/logstash-filter-xml/pull/70)
   - [DOC] Added info about non valid characters [#72](https://github.com/logstash-plugins/logstash-filter-xml/pull/72)  
diff --git a/logstash-filter-xml.gemspec b/logstash-filter-xml.gemspec
index f860aa8..1ff7a1f 100644
--- a/logstash-filter-xml.gemspec
+++ b/logstash-filter-xml.gemspec
@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-filter-xml'
-  s.version         = '4.1.3'
+  s.version         = '4.2.0'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Parses XML into fields"
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"
@@ -20,8 +20,9 @@ Gem::Specification.new do |s|
   s.metadata = { "logstash_plugin" => "true", "logstash_group" => "filter" }
 
   # Gem dependencies
+  s.add_runtime_dependency 'logstash-core', '>= 8.4.0' # this provides Ruby 2.6.0
   s.add_runtime_dependency "logstash-core-plugin-api", ">= 1.60", "<= 2.99"
-  s.add_runtime_dependency 'nokogiri'
+  s.add_runtime_dependency 'nokogiri', '>= 1.13.8' # >= 1.13.0 requires Ruby 2.6+
   s.add_runtime_dependency 'xml-simple'
 
   s.add_development_dependency 'logstash-devutils'