diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 79156c9ef..1bd08d09b 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -214,7 +214,7 @@ jobs:
         ssp-version: ["v2.5.0"]
     env:
       SUITE_BASE_URL: https://localhost.emobix.co.uk:8443
-      VERSION: release-v5.1.39
+      VERSION: release-v5.3.4
     steps:
       - uses: actions/checkout@v6
         with:
@@ -259,6 +259,15 @@ jobs:
       - name: Run RP backchannel
         run: |
           ./conformance-suite/scripts/run-test-plan.py     "oidcc-backchannel-rp-initiated-logout-certification-test-plan[response_type=code][client_registration=static_client]" ./main/conformance-tests/conformance-back-channel-logout-ci.json
+      - name: Dump OP logs
+        if: failure()
+        working-directory: ./main
+        # What the suite reports is only its own side of the exchange, and some failures say nothing there:
+        # a request the OP never sent reads as a test waiting for a callback until it times out, with no
+        # failed check anywhere. The reason is in the OP's log, which otherwise leaves with the container.
+        # Same compose invocation as "Start SSP docker", so this addresses the project that step created.
+        run: |
+          docker compose -f docker/docker-compose.yml --project-directory . logs --no-color --tail 2000 oidc-op || true
       - name: Stop SSP
         working-directory: ./main
         run: |
diff --git a/docker/conformance.sql b/docker/conformance.sql
index 4194f9e85..8fe1728ca 100644
--- a/docker/conformance.sql
+++ b/docker/conformance.sql
@@ -45,13 +45,13 @@ CREATE TABLE oidc_client (
             expires_at TIMESTAMP NULL DEFAULT NULL,
             is_federated BOOLEAN NOT NULL DEFAULT false
 );
--- Used 'httpd' host for back-channel logout url (https://httpd:8443/test/a/simplesamlphp-module-oidc/backchannel_logout)
+-- Used 'nginx' host for back-channel logout url (https://nginx:8443/test/a/simplesamlphp-module-oidc/backchannel_logout)
 -- since this is the hostname of conformance server while running in container environment
-INSERT INTO oidc_client VALUES('_55a99a1d298da921cb27d700d4604352e51171ebc4','_8967dd97d07cc59db7055e84ac00e79005157c1132','Conformance Client 1',replace('Client 1 for Conformance Testing  https://openid.net/certification/connect_op_testing/\n','\n',char(10)),'example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email","address","phone","offline_access"]',1,1,NULL,'["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/post_logout_redirect"]','https://httpd:8443/test/a/simplesamlphp-module-oidc/backchannel_logout',NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
+INSERT INTO oidc_client VALUES('_55a99a1d298da921cb27d700d4604352e51171ebc4','_8967dd97d07cc59db7055e84ac00e79005157c1132','Conformance Client 1',replace('Client 1 for Conformance Testing  https://openid.net/certification/connect_op_testing/\n','\n',char(10)),'example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email","address","phone","offline_access"]',1,1,NULL,'["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/post_logout_redirect"]','https://nginx:8443/test/a/simplesamlphp-module-oidc/backchannel_logout',NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
 INSERT INTO oidc_client VALUES('_34efb61060172a11d62101bc804db789f8f9100b0e','_91a4607a1c10ba801268929b961b3f6c067ff82d21','Conformance Client 2','','example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email","offline_access"]',1,1,NULL,NULL,NULL,NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
 INSERT INTO oidc_client VALUES('_0afb7d18e54b2de8205a93e38ca119e62ee321d031','_944e73bbeec7850d32b68f1b5c780562c955967e4e','Conformance Client 3','Client for client_secret_post','example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email"]',1,1,NULL,NULL,NULL,NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
 INSERT INTO oidc_client VALUES('_8957eda35234902ba8343c0cdacac040310f17dfca','_322d16999f9da8b5abc9e9c0c08e853f60f4dc4804','RP-Initiated Logout Client','Client for testing RP-Initiated Logout','example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email","address","phone"]',1,1,NULL,'["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/post_logout_redirect"]',NULL,NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
-INSERT INTO oidc_client VALUES('_9fe2f7589ece1b71f5ef75a91847d71bc5125ec2a6','_3c0beb20194179c01d7796c6836f62801e9ed4b368','Back-Channel Logout Client','Client for testing Back-Channel Logout','example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email","address","phone"]',1,1,NULL,'["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/post_logout_redirect"]','https://httpd:8443/test/a/simplesamlphp-module-oidc/backchannel_logout',NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
+INSERT INTO oidc_client VALUES('_9fe2f7589ece1b71f5ef75a91847d71bc5125ec2a6','_3c0beb20194179c01d7796c6836f62801e9ed4b368','Back-Channel Logout Client','Client for testing Back-Channel Logout','example-userpass','["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/callback","https:\/\/www.certification.openid.net\/test\/a\/simplesamlphp-module-oidc\/callback"]','["openid","profile","email","address","phone"]',1,1,NULL,'["https:\/\/localhost.emobix.co.uk:8443\/test\/a\/simplesamlphp-module-oidc\/post_logout_redirect"]','https://nginx:8443/test/a/simplesamlphp-module-oidc/backchannel_logout',NULL,NULL, NULL, NULL, NULL, NULL, 'manual', NULL, NULL, NULL, false);
 CREATE TABLE oidc_access_token (
             id VARCHAR(191) PRIMARY KEY NOT NULL,
             scopes TEXT,
diff --git a/docs/5-oidc-conformance.md b/docs/5-oidc-conformance.md
index 420e8c44c..3b2a24445 100644
--- a/docs/5-oidc-conformance.md
+++ b/docs/5-oidc-conformance.md
@@ -17,7 +17,7 @@ Clone, build, and run the conformance test suite:
 ```bash
 git clone https://gitlab.com/openid/conformance-suite.git
 cd conformance-suite
-git checkout release-v5.1.39
+git checkout release-v5.3.4
 MAVEN_CACHE=./m2 docker-compose -f builder-compose.yml run builder
 docker-compose up
 ```