diff --git a/.gitmodules b/.gitmodules
index 9835e2ed4b03..aa44c8311acc 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -8,7 +8,7 @@
 [submodule "content-modules/opentelemetry-specification"]
 	path = content-modules/opentelemetry-specification
 	url = https://github.com/open-telemetry/opentelemetry-specification.git
-	spec-pin = v1.51.0
+	spec-pin = v1.51.0-20-gb503d68
 [submodule "content-modules/community"]
 	path = content-modules/community
 	url = https://github.com/open-telemetry/community
diff --git a/content-modules/opentelemetry-specification b/content-modules/opentelemetry-specification
index 5e5f8fd53f94..b503d681a035 160000
--- a/content-modules/opentelemetry-specification
+++ b/content-modules/opentelemetry-specification
@@ -1 +1 @@
-Subproject commit 5e5f8fd53f94a310e95f438274c9aba7c6923ca7
+Subproject commit b503d681a035d7c35c4b35aa5774a08d2f06f25c
diff --git a/static/refcache.json b/static/refcache.json
index 80793a03e69e..fed6471ac179 100644
--- a/static/refcache.json
+++ b/static/refcache.json
@@ -13421,7 +13421,7 @@
   },
   "https://github.com/openzipkin-contrib/zipkin-otel": {
     "StatusCode": 206,
-    "LastSeen": "2025-12-04T09:48:56.191148689Z"
+    "LastSeen": "2025-11-22T10:36:35.761094122Z"
   },
   "https://github.com/openzipkin/b3-propagation": {
     "StatusCode": 206,