diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6bf8010..60d1f66 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [ '3.0', '3.1', '3.2', '3.3', '3.4' ]
+        ruby-version: [ '2.7', '3.0', '3.1', '3.2', '3.3', '3.4' ]
     steps:
       - uses: actions/checkout@v3
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 3cc9307..c4ac2b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,8 @@
 PATH
   remote: .
   specs:
-    absmartly-sdk (1.1.2)
+    absmartly-sdk (1.2.1)
+      base64 (~> 0.2)
       faraday (~> 2.0)
       faraday-retry (~> 2.0)
       murmurhash3 (~> 0.1.7)
@@ -10,13 +11,14 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
+    base64 (0.3.0)
     byebug (11.1.3)
     diff-lcs (1.5.0)
     faraday (2.7.4)
       faraday-net_http (>= 2.0, < 3.1)
       ruby2_keywords (>= 0.0.4)
     faraday-net_http (3.0.2)
-    faraday-retry (2.1.0)
+    faraday-retry (2.4.0)
       faraday (~> 2.0)
     io-console (0.5.6)
     irb (1.2.6)
@@ -31,7 +33,7 @@ GEM
     regexp_parser (2.5.0)
     reline (0.1.5)
       io-console (~> 0.5)
-    rexml (3.2.8)
+    rexml (3.4.4)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
diff --git a/absmartly.gemspec b/absmartly.gemspec
index e931c07..7fc5366 100644
--- a/absmartly.gemspec
+++ b/absmartly.gemspec
@@ -32,6 +32,9 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  # Required for Ruby 3.4+ where base64 is no longer a default gem.
+  # Faraday 2.7.x uses base64 but doesn't declare it as a dependency.
+  spec.add_dependency "base64", "~> 0.2"
   spec.add_dependency "faraday", "~> 2.0"
   spec.add_dependency "faraday-retry", "~> 2.0"
   spec.add_dependency "murmurhash3", "~> 0.1.7"
diff --git a/lib/absmartly/version.rb b/lib/absmartly/version.rb
index 4e387d3..d2c762f 100644
--- a/lib/absmartly/version.rb
+++ b/lib/absmartly/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Absmartly
-  VERSION = "1.2.0"
+  VERSION = "1.2.1"
 end
diff --git a/lib/client_config.rb b/lib/client_config.rb
index 113a507..0b6437c 100644
--- a/lib/client_config.rb
+++ b/lib/client_config.rb
@@ -17,7 +17,7 @@ class ClientConfig
   def_delegators :@http_client_config, :connect_timeout, :connection_request_timeout, :retry_interval, :max_retries
 
   def self.create(endpoint: nil, environment: nil, application: nil, api_key: nil)
-    new(endpoint:, environment:, application:, api_key:)
+    new(endpoint: endpoint, environment: environment, application: application, api_key: api_key)
   end
 
   def self.create_from_properties(properties, prefix)
diff --git a/lib/context_config.rb b/lib/context_config.rb
index 156793e..0cb7fe7 100644
--- a/lib/context_config.rb
+++ b/lib/context_config.rb
@@ -29,7 +29,8 @@ def unit(unit_type)
   end
 
   def set_attributes(attributes)
-    @attributes ||= attributes.transform_keys(&:to_sym)
+    @attributes.merge!(attributes.transform_keys(&:to_sym))
+    self
   end
 
   def set_attribute(name, value)
diff --git a/spec/context_config_spec.rb b/spec/context_config_spec.rb
index 109267b..ed2e355 100644
--- a/spec/context_config_spec.rb
+++ b/spec/context_config_spec.rb
@@ -22,12 +22,31 @@
   it ".set_attributes" do
     attributes = { "user_agent": "Chrome", "age": 9 }
     config = described_class.create
-    config.attributes = attributes
+                            .set_attributes(attributes)
     expect(config.attribute("user_agent")).to eq("Chrome")
     expect(config.attribute("age")).to eq(9)
     expect(config.attributes).to eq(attributes)
   end
 
+  it ".set_attributes merges with set_attribute" do
+    config = described_class.create
+                            .set_attribute("attr1", "value1")
+                            .set_attributes({ attr2: "value2", attr3: 15 })
+
+    expect(config.attribute("attr1")).to eq("value1")
+    expect(config.attribute("attr2")).to eq("value2")
+    expect(config.attribute("attr3")).to eq(15)
+  end
+
+  it ".set_attributes can be called multiple times" do
+    config = described_class.create
+                            .set_attributes({ attr1: "value1" })
+                            .set_attributes({ attr2: "value2" })
+
+    expect(config.attribute("attr1")).to eq("value1")
+    expect(config.attribute("attr2")).to eq("value2")
+  end
+
   it ".set_override" do
     config = described_class.create
                             .set_override("exp_test", 2)
diff --git a/spec/context_spec.rb b/spec/context_spec.rb
index f5f4b42..268076c 100644
--- a/spec/context_spec.rb
+++ b/spec/context_spec.rb
@@ -434,6 +434,30 @@ def faraday_response(content)
     expect(context.override("exp_test_new_2")).to eq(5)
   end
 
+  it "set_attribute and set_attributes" do
+    context = create_ready_context
+
+    context.set_attribute("attr1", "value1")
+    context.set_attributes({ attr2: "value2", attr3: 15 })
+
+    attrs = context.instance_variable_get(:@attributes)
+    expect(attrs).to include(Attribute.new("attr1", "value1", clock_in_millis))
+    expect(attrs).to include(Attribute.new(:attr2, "value2", clock_in_millis))
+    expect(attrs).to include(Attribute.new(:attr3, 15, clock_in_millis))
+  end
+
+  it "set_attributes before ready" do
+    context = create_context(data_future)
+    expect(context.ready?).to be_falsey
+
+    context.set_attribute("attr1", "value1")
+    context.set_attributes({ attr2: "value2" })
+
+    attrs = context.instance_variable_get(:@attributes)
+    expect(attrs).to include(Attribute.new("attr1", "value1", clock_in_millis))
+    expect(attrs).to include(Attribute.new(:attr2, "value2", clock_in_millis))
+  end
+
   it "set custom assignment" do
     context = create_ready_context
     context.set_custom_assignment("exp_test", 2)