diff --git a/.gitmodules b/.gitmodules
index a596847ecb5e..6e0cf8748a30 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,7 +16,7 @@
 [submodule "content-modules/opentelemetry-proto"]
 	path = content-modules/opentelemetry-proto
 	url = https://github.com/open-telemetry/opentelemetry-proto
-	otlp-pin = v1.8.0
+	otlp-pin = v1.9.0
 [submodule "content-modules/semantic-conventions"]
 	path = content-modules/semantic-conventions
 	url = https://github.com/open-telemetry/semantic-conventions
diff --git a/content-modules/opentelemetry-proto b/content-modules/opentelemetry-proto
index c0a98a1847d3..a8951735f780 160000
--- a/content-modules/opentelemetry-proto
+++ b/content-modules/opentelemetry-proto
@@ -1 +1 @@
-Subproject commit c0a98a1847d3124ac5f9ecd02d0e2d2732bbb590
+Subproject commit a8951735f7801e8adfaec5c0ace9262771cfec6e
diff --git a/scripts/content-modules/adjust-pages.pl b/scripts/content-modules/adjust-pages.pl
index e1a7797b3bcb..7d43d3a3712f 100755
--- a/scripts/content-modules/adjust-pages.pl
+++ b/scripts/content-modules/adjust-pages.pl
@@ -25,7 +25,7 @@
 my %versionsRaw = # Keyname must end with colons because the auto-version update script expects one
   qw(
     spec: 1.50.0
-    otlp: 1.8.0
+    otlp: 1.9.0
     semconv: 1.38.0
   );
 # Versions map without the colon in the keys
diff --git a/static/refcache.json b/static/refcache.json
index aa7dc7788542..8268b1705587 100644
--- a/static/refcache.json
+++ b/static/refcache.json
@@ -10923,6 +10923,38 @@
     "StatusCode": 206,
     "LastSeen": "2025-10-26T09:41:46.525821802Z"
   },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/README.md#maturity-level": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:13:16.585236349Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/examples/README.md": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:13:20.923164855Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/opentelemetry/proto": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:13:13.354758731Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/opentelemetry/proto/collector": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:13:08.524528832Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/opentelemetry/proto/collector/logs/v1/logs_service.proto": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:12:52.9831633Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/opentelemetry/proto/collector/metrics/v1/metrics_service.proto": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:12:56.586138958Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/opentelemetry/proto/collector/profiles/v1development/profiles_service.proto": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:13:04.728250415Z"
+  },
+  "https://github.com/open-telemetry/opentelemetry-proto/tree/v1.9.0/opentelemetry/proto/collector/trace/v1/trace_service.proto": {
+    "StatusCode": 206,
+    "LastSeen": "2025-10-31T23:13:00.763930333Z"
+  },
   "https://github.com/open-telemetry/opentelemetry-python": {
     "StatusCode": 206,
     "LastSeen": "2025-10-30T09:40:43.630492147Z"