diff --git a/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md b/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md
index 25396307f1d..703074b0be6 100644
--- a/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-alpha.1
+
+Released 2024-May-20
+
 * Fixed an issue with corrupted buffers when reading both OpenMetrics and
   plain text formats from Prometheus exporters.
   ([#5623](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5623))
diff --git a/src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md b/src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md
index c9944512d32..abb4d7287fc 100644
--- a/src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md
+++ b/src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-alpha.1
+
+Released 2024-May-20
+
 * Fixed an issue with corrupted buffers when reading both OpenMetrics and
   plain text formats from Prometheus exporters.
   ([#5623](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5623))
diff --git a/src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md b/src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md
index 577ddc62a97..b0cb58b6b50 100644
--- a/src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md
+++ b/src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.9.0-alpha.1
+
+Released 2024-May-20
+
 ## 1.7.0-beta.1
 
 Released 2023-Dec-08