diff --git a/POST_INSTALL_MESSAGE b/POST_INSTALL_MESSAGE
new file mode 100644
index 000000000..96c3ecaa5
--- /dev/null
+++ b/POST_INSTALL_MESSAGE
@@ -0,0 +1,3 @@
+Ruby 3.0 has reached EoL 2024-04-23. OTel Ruby Contrib gems will no longer accept new features or bug fixes for Ruby 3.0 after 2025-01-15. Please upgrade to Ruby 3.1 or higher to continue receiving updates.
+
+Rails 6.1 has reached EoL 2024-10-01. OTel Ruby Contrib gems will no longer accept new features or bug fixes for Rails 6.1 after 2025-01-15. Please upgrade to Rails 7.0 or higher to continue receiving updates.
diff --git a/helpers/mysql/opentelemetry-helpers-mysql.gemspec b/helpers/mysql/opentelemetry-helpers-mysql.gemspec
index ff93af073..f18fff675 100644
--- a/helpers/mysql/opentelemetry-helpers-mysql.gemspec
+++ b/helpers/mysql/opentelemetry-helpers-mysql.gemspec
@@ -44,4 +44,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/helpers/sql-obfuscation/opentelemetry-helpers-sql-obfuscation.gemspec b/helpers/sql-obfuscation/opentelemetry-helpers-sql-obfuscation.gemspec
index 89ea0b8b1..eefb5dae9 100644
--- a/helpers/sql-obfuscation/opentelemetry-helpers-sql-obfuscation.gemspec
+++ b/helpers/sql-obfuscation/opentelemetry-helpers-sql-obfuscation.gemspec
@@ -42,4 +42,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/instrumentation/all/opentelemetry-instrumentation-all.gemspec b/instrumentation/all/opentelemetry-instrumentation-all.gemspec
index c9603b518..6b592127f 100644
--- a/instrumentation/all/opentelemetry-instrumentation-all.gemspec
+++ b/instrumentation/all/opentelemetry-instrumentation-all.gemspec
@@ -77,4 +77,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/instrumentation/rails/opentelemetry-instrumentation-rails.gemspec b/instrumentation/rails/opentelemetry-instrumentation-rails.gemspec
index 0328a44ae..c9243add0 100644
--- a/instrumentation/rails/opentelemetry-instrumentation-rails.gemspec
+++ b/instrumentation/rails/opentelemetry-instrumentation-rails.gemspec
@@ -48,4 +48,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'yard', '~> 0.9'
 
   spec.metadata['source_code_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/tree/main/instrumentation/rails' if spec.respond_to?(:metadata)
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/processor/baggage/opentelemetry-processor-baggage.gemspec b/processor/baggage/opentelemetry-processor-baggage.gemspec
index 8d429b12e..f625e91b1 100644
--- a/processor/baggage/opentelemetry-processor-baggage.gemspec
+++ b/processor/baggage/opentelemetry-processor-baggage.gemspec
@@ -41,4 +41,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/propagator/ottrace/opentelemetry-propagator-ottrace.gemspec b/propagator/ottrace/opentelemetry-propagator-ottrace.gemspec
index 9e4aa0bcc..9417ed10b 100644
--- a/propagator/ottrace/opentelemetry-propagator-ottrace.gemspec
+++ b/propagator/ottrace/opentelemetry-propagator-ottrace.gemspec
@@ -39,4 +39,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/propagator/vitess/opentelemetry-propagator-vitess.gemspec b/propagator/vitess/opentelemetry-propagator-vitess.gemspec
index 474f06f7c..c2300ebbf 100644
--- a/propagator/vitess/opentelemetry-propagator-vitess.gemspec
+++ b/propagator/vitess/opentelemetry-propagator-vitess.gemspec
@@ -40,4 +40,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/propagator/xray/opentelemetry-propagator-xray.gemspec b/propagator/xray/opentelemetry-propagator-xray.gemspec
index 8efcfc243..8305dac7a 100644
--- a/propagator/xray/opentelemetry-propagator-xray.gemspec
+++ b/propagator/xray/opentelemetry-propagator-xray.gemspec
@@ -42,4 +42,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/resources/azure/opentelemetry-resource-detector-azure.gemspec b/resources/azure/opentelemetry-resource-detector-azure.gemspec
index aaa321054..005742c27 100644
--- a/resources/azure/opentelemetry-resource-detector-azure.gemspec
+++ b/resources/azure/opentelemetry-resource-detector-azure.gemspec
@@ -42,4 +42,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/resources/container/opentelemetry-resource-detector-container.gemspec b/resources/container/opentelemetry-resource-detector-container.gemspec
index 1589db320..83b5438bf 100644
--- a/resources/container/opentelemetry-resource-detector-container.gemspec
+++ b/resources/container/opentelemetry-resource-detector-container.gemspec
@@ -41,4 +41,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end
diff --git a/resources/google_cloud_platform/opentelemetry-resource-detector-google_cloud_platform.gemspec b/resources/google_cloud_platform/opentelemetry-resource-detector-google_cloud_platform.gemspec
index 564b9d620..acedf0e06 100644
--- a/resources/google_cloud_platform/opentelemetry-resource-detector-google_cloud_platform.gemspec
+++ b/resources/google_cloud_platform/opentelemetry-resource-detector-google_cloud_platform.gemspec
@@ -43,4 +43,6 @@ Gem::Specification.new do |spec|
     spec.metadata['bug_tracker_uri'] = 'https://github.com/open-telemetry/opentelemetry-ruby-contrib/issues'
     spec.metadata['documentation_uri'] = "https://rubydoc.info/gems/#{spec.name}/#{spec.version}"
   end
+
+  spec.post_install_message = File.read(File.expand_path('../../POST_INSTALL_MESSAGE', __dir__))
 end