diff --git a/.github/workflows/rspec.yml b/.github/workflows/rspec.yml
new file mode 100644
index 0000000..b531834
--- /dev/null
+++ b/.github/workflows/rspec.yml
@@ -0,0 +1,18 @@
+name: RSpec
+
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: .ruby-version
+          bundler-cache: true
+
+      - run: bundle exec rspec
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..fcdb2e1
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+4.0.0
diff --git a/Gemfile.lock b/Gemfile.lock
index 97443bc..2636b1a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,46 +8,52 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.4)
-      public_suffix (>= 2.0.2, < 6.0)
+    addressable (2.8.9)
+      public_suffix (>= 2.0.2, < 8.0)
+    bigdecimal (4.0.1)
     coderay (1.1.3)
-    crack (0.4.5)
+    crack (1.0.1)
+      bigdecimal
       rexml
-    diff-lcs (1.5.0)
+    diff-lcs (1.6.2)
     faraday (2.14.1)
       faraday-net_http (>= 2.0, < 3.5)
       json
       logger
     faraday-net_http (3.4.2)
       net-http (~> 0.5)
-    hashdiff (1.0.1)
-    json (2.18.1)
+    hashdiff (1.2.1)
+    io-console (0.8.2)
+    json (2.19.2)
     logger (1.7.0)
-    method_source (1.0.0)
+    method_source (1.1.0)
     net-http (0.9.1)
       uri (>= 0.11.1)
-    pry (0.14.2)
+    pry (0.16.0)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    public_suffix (5.0.1)
-    rake (13.0.6)
+      reline (>= 0.6.0)
+    public_suffix (7.0.5)
+    rake (13.3.1)
+    reline (0.6.3)
+      io-console (~> 0.5)
     require_all (3.0.0)
-    rexml (3.4.2)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.2)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.3)
+    rexml (3.4.4)
+    rspec (3.13.2)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.6)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.5)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.8)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.1)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.7)
     uri (1.1.1)
-    webmock (3.18.1)
+    webmock (3.26.2)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
@@ -56,7 +62,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 2.1)
+  bundler
   pry
   rake
   rspec
@@ -64,4 +70,4 @@ DEPENDENCIES
   webmock
 
 BUNDLED WITH
-   2.1.4
+  4.0.7
diff --git a/lib/sendyr/client.rb b/lib/sendyr/client.rb
index 93a519e..af19060 100644
--- a/lib/sendyr/client.rb
+++ b/lib/sendyr/client.rb
@@ -81,7 +81,7 @@ def update_subscription(email, opts = {})
 			end
 
 			unless [:complained, :unsubscribed].include?(status)
-				subscribe({email: email}.merge(opts)) == true
+				subscribe(**{email: email}.merge(opts)) == true
 			else
 				false
 			end
diff --git a/sendyr.gemspec b/sendyr.gemspec
index 3136f76..6dcf8f9 100644
--- a/sendyr.gemspec
+++ b/sendyr.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "faraday"
   spec.add_runtime_dependency "require_all"
 
-  spec.add_development_dependency "bundler", "~> 2.1"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"
   spec.add_development_dependency "webmock"