diff --git a/modules/repository-s3/src/javaRestTest/java/org/elasticsearch/repositories/s3/RepositoryS3MinioBasicCredentialsRestIT.java b/modules/repository-s3/src/javaRestTest/java/org/elasticsearch/repositories/s3/RepositoryS3MinioBasicCredentialsRestIT.java
index a314372464ff4..3d7c8dd150610 100644
--- a/modules/repository-s3/src/javaRestTest/java/org/elasticsearch/repositories/s3/RepositoryS3MinioBasicCredentialsRestIT.java
+++ b/modules/repository-s3/src/javaRestTest/java/org/elasticsearch/repositories/s3/RepositoryS3MinioBasicCredentialsRestIT.java
@@ -21,9 +21,6 @@
 
 import java.util.Locale;
 
-import static org.elasticsearch.repositories.s3.S3Service.REPOSITORY_S3_CAS_ANTI_CONTENTION_DELAY_SETTING;
-import static org.elasticsearch.repositories.s3.S3Service.REPOSITORY_S3_CAS_TTL_SETTING;
-
 @ThreadLeakFilters(filters = { TestContainersThreadFilter.class })
 @ThreadLeakScope(ThreadLeakScope.Scope.NONE) // https://github.com/elastic/elasticsearch/issues/102482
 public class RepositoryS3MinioBasicCredentialsRestIT extends AbstractRepositoryS3RestTestCase {
@@ -42,10 +39,6 @@ public class RepositoryS3MinioBasicCredentialsRestIT extends AbstractRepositoryS
         .keystore("s3.client." + CLIENT + ".access_key", ACCESS_KEY)
         .keystore("s3.client." + CLIENT + ".secret_key", SECRET_KEY)
         .setting("s3.client." + CLIENT + ".endpoint", minioFixture::getAddress)
-        // Skip listing of pre-existing uploads during a CAS because MinIO sometimes leaks them; also reduce the delay before proceeding
-        // TODO do not set these if running a MinIO version in which https://github.com/minio/minio/issues/21189 is fixed
-        .setting(REPOSITORY_S3_CAS_TTL_SETTING.getKey(), "-1")
-        .setting(REPOSITORY_S3_CAS_ANTI_CONTENTION_DELAY_SETTING.getKey(), "100ms")
         .build();
 
     @ClassRule
diff --git a/test/fixtures/minio-fixture/src/main/java/org/elasticsearch/test/fixtures/minio/MinioTestContainer.java b/test/fixtures/minio-fixture/src/main/java/org/elasticsearch/test/fixtures/minio/MinioTestContainer.java
index 1bb3caef637d4..27baa72f027e4 100644
--- a/test/fixtures/minio-fixture/src/main/java/org/elasticsearch/test/fixtures/minio/MinioTestContainer.java
+++ b/test/fixtures/minio-fixture/src/main/java/org/elasticsearch/test/fixtures/minio/MinioTestContainer.java
@@ -15,8 +15,10 @@
 
 public final class MinioTestContainer extends DockerEnvironmentAwareTestContainer {
 
+    // NB releases earlier than 2025-05-24 are buggy, see https://github.com/minio/minio/issues/21189, and #127166 for a workaround
+    public static final String DOCKER_BASE_IMAGE = "minio/minio:RELEASE.2025-05-24T17-08-30Z";
+
     private static final int servicePort = 9000;
-    public static final String DOCKER_BASE_IMAGE = "minio/minio:RELEASE.2024-12-18T13-15-44Z";
     private final boolean enabled;
 
     /**
diff --git a/x-pack/plugin/snapshot-repo-test-kit/qa/minio/src/javaRestTest/java/org/elasticsearch/repositories/blobstore/testkit/analyze/MinioRepositoryAnalysisRestIT.java b/x-pack/plugin/snapshot-repo-test-kit/qa/minio/src/javaRestTest/java/org/elasticsearch/repositories/blobstore/testkit/analyze/MinioRepositoryAnalysisRestIT.java
index 3b5edaf768057..0929561909963 100644
--- a/x-pack/plugin/snapshot-repo-test-kit/qa/minio/src/javaRestTest/java/org/elasticsearch/repositories/blobstore/testkit/analyze/MinioRepositoryAnalysisRestIT.java
+++ b/x-pack/plugin/snapshot-repo-test-kit/qa/minio/src/javaRestTest/java/org/elasticsearch/repositories/blobstore/testkit/analyze/MinioRepositoryAnalysisRestIT.java
@@ -31,10 +31,8 @@ public class MinioRepositoryAnalysisRestIT extends AbstractRepositoryAnalysisRes
         .distribution(DistributionType.DEFAULT)
         .keystore("s3.client.repository_test_kit.access_key", "s3_test_access_key")
         .keystore("s3.client.repository_test_kit.secret_key", "s3_test_secret_key")
-        .setting("s3.client.repository_test_kit.protocol", () -> "http")
         .setting("s3.client.repository_test_kit.endpoint", minioFixture::getAddress)
         .setting("xpack.security.enabled", "false")
-        // Additional tracing related to investigation into https://github.com/elastic/elasticsearch/issues/102294
         .setting("xpack.ml.enabled", "false")
         .build();