diff --git a/vmpooler.gemspec b/vmpooler.gemspec
index 35abb9c..ec5832c 100644
--- a/vmpooler.gemspec
+++ b/vmpooler.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'nokogiri', '~> 1.10'
   s.add_dependency 'opentelemetry-api', '~> 0.7.0'
   s.add_dependency 'opentelemetry-exporter-jaeger', '~> 0.7.0'
-  s.add_dependency 'opentelemetry-instrumentation-concurrent_ruby', '~> 0.7.0'
+  s.add_dependency 'opentelemetry-instrumentation-concurrent_ruby', '>= 0.7', '< 0.9'
   s.add_dependency 'opentelemetry-instrumentation-redis', '~> 0.7.0'
   s.add_dependency 'opentelemetry-instrumentation-sinatra', '~> 0.7.1'
   s.add_dependency 'opentelemetry-resource_detectors', '~> 0.7.0'