diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 56e68395..d4e4ea28 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ["3.2", "jruby-9.4"]
+        version: ["3.2", "3.4", "jruby-9.4"]
     with:
       version: ${{ matrix.version }}
 
diff --git a/launchdarkly-server-sdk.gemspec b/launchdarkly-server-sdk.gemspec
index 8c7bfc5a..6644a321 100644
--- a/launchdarkly-server-sdk.gemspec
+++ b/launchdarkly-server-sdk.gemspec
@@ -21,6 +21,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 3.1.0"
 
   spec.add_development_dependency "aws-sdk-dynamodb", "~> 1.57"
+  spec.add_development_dependency "bigdecimal", "~> 3.1.1" # Neccessary for aws-sdk-dynamodb https://github.com/aws/aws-sdk-ruby/issues/3271
   spec.add_development_dependency "bundler", "~> 2.2", ">= 2.2.3"
   spec.add_development_dependency "connection_pool", "~> 2.3"
   spec.add_development_dependency "diplomat", "~> 2.6"