diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48c379b7de..0e30d1784e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,19 @@ Increment the:
 
 * [BUILD] Remove WITH_REMOVE_METER_PREVIEW, use WITH_ABI_VERSION_2 instead
   [#2370](https://github.com/open-telemetry/opentelemetry-cpp/pull/2370)
+* [BUILD] Make WITH_OTLP_HTTP_SSL_PREVIEW mainstream
+  [#2378](https://github.com/open-telemetry/opentelemetry-cpp/pull/2378)
+
+Important changes:
+
+* [BUILD] Make WITH_OTLP_HTTP_SSL_PREVIEW mainstream
+  [#2378](https://github.com/open-telemetry/opentelemetry-cpp/pull/2378)
+  * The experimental `CMake` option `WITH_OTLP_HTTP_SSL_PREVIEW`
+    is now promoted to stable. The default is changed to `ON`.
+  * The experimental `CMake` option `WITH_OTLP_HTTP_SSL_TLS_PREVIEW`
+    is now promoted to stable. The default is changed to `ON`.
+  * These build options are scheduled to be removed by the next release,
+    building without SSL/TLS will no longer be possible.
 
 Breaking changes:
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4af81bf0e9..b72e58a963 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -275,12 +275,12 @@ endif()
 
 option(WITH_ASYNC_EXPORT_PREVIEW "Whether to enable async export" OFF)
 
-# EXPERIMENTAL
-option(WITH_OTLP_HTTP_SSL_PREVIEW "Whether to enable otlp http ssl export" OFF)
+# STABLE
+option(WITH_OTLP_HTTP_SSL_PREVIEW "Whether to enable otlp http ssl export" ON)
 
-# EXPERIMENTAL
+# STABLE
 option(WITH_OTLP_HTTP_SSL_TLS_PREVIEW
-       "Whether to enable otlp http ssl tls min/max/cipher options" OFF)
+       "Whether to enable otlp http ssl tls min/max/cipher options" ON)
 
 # Exemplar specs status is experimental, so behind feature flag by default
 option(WITH_METRICS_EXEMPLAR_PREVIEW