diff --git a/content-modules/opentelemetry-specification b/content-modules/opentelemetry-specification
index d855249b210e..b064af8f1545 160000
--- a/content-modules/opentelemetry-specification
+++ b/content-modules/opentelemetry-specification
@@ -1 +1 @@
-Subproject commit d855249b210ecd832889fc4ce91a4444f82e252a
+Subproject commit b064af8f1545ca61ca99d6a07c37f9fb33186e51
diff --git a/scripts/content-modules/adjust-pages.pl b/scripts/content-modules/adjust-pages.pl
index a918c7aa022e..448629e59827 100755
--- a/scripts/content-modules/adjust-pages.pl
+++ b/scripts/content-modules/adjust-pages.pl
@@ -19,7 +19,7 @@
 my $specBasePath = '/docs/specs';
 my $path_base_for_github_subdir = "content/en$specBasePath";
 my %versions = qw(
-  spec: 1.27.0
+  spec: 1.28.0
   otlp: 1.0.0
   semconv: 1.24.0
 );
diff --git a/static/refcache.json b/static/refcache.json
index f6fd3968deb4..8ac6800dbc4c 100644
--- a/static/refcache.json
+++ b/static/refcache.json
@@ -551,6 +551,10 @@
     "StatusCode": 206,
     "LastSeen": "2023-06-29T16:19:47.798342-04:00"
   },
+  "https://datatracker.ietf.org/doc/html/rfc3986#section-3": {
+    "StatusCode": 200,
+    "LastSeen": "2023-12-16T15:16:56.545821944Z"
+  },
   "https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.1": {
     "StatusCode": 200,
     "LastSeen": "2023-06-30T11:43:34.517727-04:00"
@@ -6887,10 +6891,22 @@
     "StatusCode": 206,
     "LastSeen": "2023-06-30T08:37:53.898384-04:00"
   },
+  "https://www.w3.org/TR/baggage": {
+    "StatusCode": 206,
+    "LastSeen": "2023-12-16T15:16:52.921552457Z"
+  },
   "https://www.w3.org/TR/baggage/": {
     "StatusCode": 206,
     "LastSeen": "2023-06-29T18:41:53.764072-04:00"
   },
+  "https://www.w3.org/TR/baggage/#header-content": {
+    "StatusCode": 206,
+    "LastSeen": "2023-12-16T15:16:50.350520378Z"
+  },
+  "https://www.w3.org/TR/trace-context": {
+    "StatusCode": 206,
+    "LastSeen": "2023-12-16T15:16:54.299474861Z"
+  },
   "https://www.w3.org/TR/trace-context/": {
     "StatusCode": 206,
     "LastSeen": "2023-06-29T18:38:04.791609-04:00"