diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..da657d1
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,3 @@
+SESSION_VALIDATOR_KEYID=''
+SESSION_VALIDATOR_URL=''
+KEY_POOL='[{"keyId":"","secret":"","acceptOnly":0}]'
diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 7f0b887..d0507c3 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-versions: ['2.6', '2.7', '3.0']
+        ruby-versions: ['2.6', '2.7', '3.0', '3.2']
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-versions }}
@@ -28,4 +28,4 @@ jobs:
           gem build *.gemspec
           gem push *.gem
       env:
-        GEM_HOST_API_KEY: "${{secrets.RUBYGEMS_AUTH_TOKEN}}"
\ No newline at end of file
+        GEM_HOST_API_KEY: "${{secrets.RUBYGEMS_AUTH_TOKEN}}"
diff --git a/.gitignore b/.gitignore
index 83f5868..bacc85b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.gem
 Gemfile.lock
 .ruby-version
+.env
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..67dd23b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+.PHONY: test sh
+
+test:
+	docker compose run --rm app bash -c "bundle install && rspec"
+
+sh:
+	docker compose run --rm app bash -c "bundle install && bash"
diff --git a/README.md b/README.md
index 1f2db72..d751d67 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# session-validator-client-ruby ![Build status](https://travis-ci.org/emartech/session-validator-client-ruby.svg?branch=master)
+# Session Validator Client Ruby ![Build Status](https://github.com/emartech/session-validator-client-ruby/actions/workflows/ruby.yml/badge.svg)
 
 Ruby client for Emarsys session validator service.
 
@@ -10,35 +10,38 @@ gem install session-validator-client
 
 ## Usage
 
-Setup the following environment variables:
-
-* `KEY_POOL`
-* `SESSION_VALIDATOR_KEYID`
-* `SESSION_VALIDATOR_URL`
-
-### Validating a single Msid
-`valid?(msid)` returns `true` if `msid` is valid
+Copy `.env.example` to `.env` and set the necessary values for usage in your service.
 
+### Create client
 ```ruby
 require "session_validator"
 
 client = SessionValidator::Client.new
-client.valid?("staging_int_5ad5f96f307cf9.61063404")
 ```
 
-### Batch validating multiple MSIDS
-`filter_invalid(msids)` returns an array of the invalid MSIDS.
+### Requests without Escher
+For mTLS on GAP.
 
 ```ruby
 require "session_validator"
 
-client = SessionValidator::Client.new
+client = SessionValidator::Client.new(use_escher: false)
+```
+
+### Validating a single MSID
+```ruby
+client.valid?("staging_int_5ad5f96f307cf9.61063404")
+```
+
+### Batch validating multiple MSIDs
+Returns an array of the invalid MSIDs.
+```ruby
 client.filter_invalid(["staging_int_5ad5f96f307cf9.61063404", "staging_int_5ad5f96f307cf9.61063405"])
 ```
 
-## Running tests
+## Local development
 
+### Running tests
 ```bash
-$ bundle install
-$ rspec
+make test
 ```
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..c84802d
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,6 @@
+services:
+  app:
+    image: ruby:3.2.5
+    working_dir: /home/app/src
+    volumes:
+      - .:/home/app/src
diff --git a/session-validator-client.gemspec b/session-validator-client.gemspec
index 4973b2f..e47a23d 100644
--- a/session-validator-client.gemspec
+++ b/session-validator-client.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = "session-validator-client"
-  s.version     = "5.1.0"
+  s.version     = "5.1.1"
   s.summary     = "Ruby client for Emarsys session validator service"
   s.authors     = ["Emarsys Technologies Ltd."]
   s.email       = "security@emarsys.com"