diff --git a/docker/docker-compose-examples/single-node-os-migration/README.md b/docker/docker-compose-examples/single-node-os-migration/README.md
index efae4c1480a6..96c249005f93 100644
--- a/docker/docker-compose-examples/single-node-os-migration/README.md
+++ b/docker/docker-compose-examples/single-node-os-migration/README.md
@@ -7,7 +7,7 @@ Runs two OpenSearch clusters side-by-side for ES → OpenSearch migration testin
 | OpenSearch 1.x (primary) | 1.3.x | https://localhost:9200 |
 | OpenSearch 3.x (shadow) | 3.8.0 | https://localhost:9201 |
 | OS 1.x Dashboards | 1.3.x | http://localhost:5601 |
-| OS 3.x Dashboards | 3.0.0 | http://localhost:5602 |
+| OS 3.x Dashboards | 3.8.0 | http://localhost:5602 |
 | dotCMS | latest | http://localhost:8082 |
 | Glowroot | - | http://localhost:4000 |
 | PostgreSQL | 18 | localhost:5432 |
diff --git a/docker/docker-compose-examples/single-node-os-migration/docker-compose.yml b/docker/docker-compose-examples/single-node-os-migration/docker-compose.yml
index 9a6b37110657..4ac1531cf8ae 100644
--- a/docker/docker-compose-examples/single-node-os-migration/docker-compose.yml
+++ b/docker/docker-compose-examples/single-node-os-migration/docker-compose.yml
@@ -2,7 +2,7 @@
 #
 # Runs BOTH search backends side-by-side for the OS 1.x → OS 3.x migration:
 #   - OpenSearch 1.3.x  + OS Dashboards 1.3.x → http://localhost:5601
-#   - OpenSearch 3.8.0  + OS Dashboards 3.0.0  → http://localhost:5602
+#   - OpenSearch 3.8.0  + OS Dashboards 3.8.0  → http://localhost:5602
 #
 # dotCMS is configured to write to OpenSearch 1.x (primary) while OpenSearch 3.x
 # shadows the traffic. Flip DOT_ES_ENDPOINTS to the opensearch3 service URL
@@ -128,11 +128,11 @@ services:
     restart: unless-stopped
 
   # ---------------------------------------------------------------------------
-  # OpenSearch Dashboards 3.0.0
+  # OpenSearch Dashboards 3.8.0
   # UI → http://localhost:5602
   # ---------------------------------------------------------------------------
   opensearch3-dashboards:
-    image: opensearchproject/opensearch-dashboards:3.0.0
+    image: opensearchproject/opensearch-dashboards:3.8.0
     environment:
       OPENSEARCH_HOSTS: '["https://opensearch3:9200"]'
       opensearch.ssl.verificationMode: "none"
diff --git a/docs/backend/OPENSEARCH_MIGRATION_TESTER_GUIDE.md b/docs/backend/OPENSEARCH_MIGRATION_TESTER_GUIDE.md
index d58b28124e6b..535de388514b 100644
--- a/docs/backend/OPENSEARCH_MIGRATION_TESTER_GUIDE.md
+++ b/docs/backend/OPENSEARCH_MIGRATION_TESTER_GUIDE.md
@@ -38,7 +38,7 @@ neutral names:
 - **Target engine** — **OpenSearch 3.x**, the engine we are migrating *to* (the "new" one).
 
 > In the lab stack below, the source engine is **OpenSearch 1.3** (standing in for a legacy
-> Elasticsearch / OpenSearch 1.x deployment) and the target engine is **OpenSearch 3.4**. The concepts
+> Elasticsearch / OpenSearch 1.x deployment) and the target engine is **OpenSearch 3.8**. The concepts
 > are identical if the source is real Elasticsearch — see the *Elasticsearch variant* note in §4.
 
 ### Concepts in two minutes
@@ -154,7 +154,7 @@ docker compose up -d
 | dotCMS | app under test | http://localhost:8082 | Admin UI + REST API. Login `admin` / `admin`. |
 | Source engine (OpenSearch 1.3) | "old" engine | https://localhost:9200 | HTTPS + auth. |
 | Source dashboards | inspect source indices | http://localhost:5601 | Login `admin` / `admin`. |
-| Target engine (OpenSearch 3.4) | "new" engine | https://localhost:9201 | HTTPS + auth. |
+| Target engine (OpenSearch 3.8) | "new" engine | https://localhost:9201 | HTTPS + auth. |
 | Target dashboards | inspect target indices | http://localhost:5602 | Login `admin` / `Dev!Search3-Kx9mP-2026`. |
 | Glowroot | JVM profiler | http://localhost:4000 | Optional. |
 | PostgreSQL | database | *(not published to host)* | Reach it via `docker compose exec db …` — see §6. |
diff --git a/dotCMS/src/docker-compose/it-test/docker-compose.yml b/dotCMS/src/docker-compose/it-test/docker-compose.yml
index 16b27fa6e7c9..e9db1eaf6b96 100644
--- a/dotCMS/src/docker-compose/it-test/docker-compose.yml
+++ b/dotCMS/src/docker-compose/it-test/docker-compose.yml
@@ -37,7 +37,7 @@ services:
             - es_net
 
     opensearch-test-upgrade:
-        image: ${OS_IMAGE_UPGRADE:-opensearchproject/opensearch:3.0.0}
+        image: ${OS_IMAGE_UPGRADE:-opensearchproject/opensearch:3.8.0}
         environment:
             - cluster.name=opensearch-upgrade-cluster
             - node.name=opensearch-upgrade-node
diff --git a/environments/environment.properties b/environments/environment.properties
index eaf48ce350af..50f0e19af74e 100644
--- a/environments/environment.properties
+++ b/environments/environment.properties
@@ -1,7 +1,7 @@
 mvn.environment.name=${env.BUILD_ENV:dev}
 default.context.name=default
 docker.image.search=opensearchproject/opensearch:1.3.6
-docker.image.search.upgrade=opensearchproject/opensearch:3.4.0
+docker.image.search.upgrade=opensearchproject/opensearch:3.8.0
 docker.image.postgres=pgvector/pgvector:pg18
 postman.collections=Maintenance_Resource
 docker.image.wiremock=wiremock/wiremock:3.5.3