diff --git a/src/OpenTelemetry.Api.ProviderBuilderExtensions/CHANGELOG.md b/src/OpenTelemetry.Api.ProviderBuilderExtensions/CHANGELOG.md
index 9d22648cd..47b77fc0d 100644
--- a/src/OpenTelemetry.Api.ProviderBuilderExtensions/CHANGELOG.md
+++ b/src/OpenTelemetry.Api.ProviderBuilderExtensions/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000`
   (`LoggerProviderBuilder` `AddInstrumentation` & `ConfigureServices` extensions
   and `IServiceCollection.ConfigureOpenTelemetryLoggerProvider` extension) will
diff --git a/src/OpenTelemetry.Api/CHANGELOG.md b/src/OpenTelemetry.Api/CHANGELOG.md
index e340f5d5b..3139700ac 100644
--- a/src/OpenTelemetry.Api/CHANGELOG.md
+++ b/src/OpenTelemetry.Api/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000` (`LoggerProvider`,
   `LoggerProviderBuilder`, & `IDeferredLoggerProviderBuilder`) will now be part
   of the public API and supported in stable builds.
diff --git a/src/OpenTelemetry.Exporter.Console/CHANGELOG.md b/src/OpenTelemetry.Exporter.Console/CHANGELOG.md
index f6a7ebb48..44d0bb78a 100644
--- a/src/OpenTelemetry.Exporter.Console/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.Console/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000`
   (`LoggerProviderBuilder.AddConsoleExporter` extension) will now be part of the
   public API and supported in stable builds.
diff --git a/src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md b/src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md
index 8b9320422..150941160 100644
--- a/src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000`
   (`LoggerProviderBuilder.AddInMemoryExporter` extension) will now be part of
   the public API and supported in stable builds.
diff --git a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md
index 4c2d56a72..bc54ca54d 100644
--- a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000`
   (`LoggerProviderBuilder.AddOtlpExporter` extension) will now be part of the
   public API and supported in stable builds.
diff --git a/src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md b/src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md
index 15dcc2f33..97999e013 100644
--- a/src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 ## 1.9.0-alpha.1
 
 Released 2024-May-20
diff --git a/src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md b/src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md
index 3bcc96de5..013bc9014 100644
--- a/src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md
+++ b/src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000`
   (`OpenTelemetryBuilder.WithLogging` method) will now be part of the public API
   and supported in stable builds.
diff --git a/src/OpenTelemetry.Extensions.Propagators/CHANGELOG.md b/src/OpenTelemetry.Extensions.Propagators/CHANGELOG.md
index 68d9cd774..345fd621f 100644
--- a/src/OpenTelemetry.Extensions.Propagators/CHANGELOG.md
+++ b/src/OpenTelemetry.Extensions.Propagators/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 ## 1.9.0-alpha.1
 
 Released 2024-May-20
diff --git a/src/OpenTelemetry/CHANGELOG.md b/src/OpenTelemetry/CHANGELOG.md
index 5f11580af..a5a637f82 100644
--- a/src/OpenTelemetry/CHANGELOG.md
+++ b/src/OpenTelemetry/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-rc.1
+
+Released 2024-Jun-07
+
 * The experimental APIs previously covered by `OTEL1000`
   (`LoggerProviderBuilder` `AddProcessor` & `ConfigureResource` extensions, and
   `LoggerProvider` `ForceFlush` & `Shutdown` extensions) will now be part of the