diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 7785935977..f1616351db 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -2960,6 +2960,7 @@ For further information about Elasticsearch security, please refer to the docume
 * link:https://www.elastic.co/guide/en/elastic-stack-overview/6.3/security-getting-started.html[Elasticsearch 6.3]
 * link:https://www.elastic.co/guide/en/elastic-stack-overview/6.4/security-getting-started.html[Elasticsearch 6.4]
 * link:https://www.elastic.co/guide/en/elastic-stack-overview/6.5/security-getting-started.html[Elasticsearch 6.5]
+* link:https://www.elastic.co/guide/en/elastic-stack-overview/6.6/security-getting-started.html[Elasticsearch 6.6]
 
 [[elasticsearch.username]]elasticsearch.username::
 +
diff --git a/WORKSPACE b/WORKSPACE
index 6e168a9a59..6fac8697d6 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -896,8 +896,8 @@ maven_jar(
 # and httpasyncclient as necessary.
 maven_jar(
     name = "elasticsearch-rest-client",
-    artifact = "org.elasticsearch.client:elasticsearch-rest-client:6.5.4",
-    sha1 = "552175b06e34df96f114d1c8aaa908e535c8f1be",
+    artifact = "org.elasticsearch.client:elasticsearch-rest-client:6.6.0",
+    sha1 = "f0ce1ea819fedde731511b440b025e4fb5a2f5f7",
 )
 
 JACKSON_VERSION = "2.9.8"
diff --git a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
index 3d59ad3605..a8eab03907 100644
--- a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
+++ b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ElasticReindexIT.java
@@ -32,7 +32,7 @@ public class ElasticReindexIT extends AbstractReindexTests {
 
   @ConfigSuite.Config
   public static Config elasticsearchV6() {
-    return getConfig(ElasticVersion.V6_5);
+    return getConfig(ElasticVersion.V6_6);
   }
 
   @ConfigSuite.Config
diff --git a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
index cf8503d9d5..3a1d05ffff 100644
--- a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
+++ b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/ssh/ElasticIndexIT.java
@@ -31,7 +31,7 @@ public class ElasticIndexIT extends AbstractIndexTests {
 
   @ConfigSuite.Config
   public static Config elasticsearchV6() {
-    return getConfig(ElasticVersion.V6_5);
+    return getConfig(ElasticVersion.V6_6);
   }
 
   @ConfigSuite.Config
diff --git a/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticVersion.java b/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticVersion.java
index b69f8f9219..6f9fac5bcb 100644
--- a/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticVersion.java
+++ b/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticVersion.java
@@ -23,6 +23,7 @@ public enum ElasticVersion {
   V6_3("6.3.*"),
   V6_4("6.4.*"),
   V6_5("6.5.*"),
+  V6_6("6.6.*"),
   V7_0("7.0.*");
 
   private final String version;
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
index b68e866e16..3687aa937f 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -46,6 +46,8 @@ public class ElasticContainer extends ElasticsearchContainer {
         return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.4.3";
       case V6_5:
         return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.5.4";
+      case V6_6:
+        return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.6.0";
       case V7_0:
         return "docker.elastic.co/elasticsearch/elasticsearch-oss:7.0.0-alpha2";
     }
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java
index c4a787f3bd..5e75c82d09 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryAccountsTest.java
@@ -34,7 +34,7 @@ public class ElasticV6QueryAccountsTest extends AbstractQueryAccountsTest {
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V6_5);
+    container = ElasticContainer.createAndStart(ElasticVersion.V6_6);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
   }
 
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
index 536ba746c9..413a8156c6 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
@@ -35,7 +35,7 @@ public class ElasticV6QueryChangesTest extends AbstractQueryChangesTest {
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V6_5);
+    container = ElasticContainer.createAndStart(ElasticVersion.V6_6);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
   }
 
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java
index 22186f53ce..84e1f8a906 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticV6QueryGroupsTest.java
@@ -34,7 +34,7 @@ public class ElasticV6QueryGroupsTest extends AbstractQueryGroupsTest {
       return;
     }
 
-    container = ElasticContainer.createAndStart(ElasticVersion.V6_5);
+    container = ElasticContainer.createAndStart(ElasticVersion.V6_6);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
   }
 
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticVersionTest.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticVersionTest.java
index ddbf9f8946..19b20eddb8 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticVersionTest.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticVersionTest.java
@@ -40,6 +40,9 @@ public class ElasticVersionTest {
     assertThat(ElasticVersion.forVersion("6.5.0")).isEqualTo(ElasticVersion.V6_5);
     assertThat(ElasticVersion.forVersion("6.5.1")).isEqualTo(ElasticVersion.V6_5);
 
+    assertThat(ElasticVersion.forVersion("6.6.0")).isEqualTo(ElasticVersion.V6_6);
+    assertThat(ElasticVersion.forVersion("6.6.1")).isEqualTo(ElasticVersion.V6_6);
+
     assertThat(ElasticVersion.forVersion("7.0.0")).isEqualTo(ElasticVersion.V7_0);
     assertThat(ElasticVersion.forVersion("7.0.1")).isEqualTo(ElasticVersion.V7_0);
   }
@@ -59,6 +62,7 @@ public class ElasticVersionTest {
     assertThat(ElasticVersion.V6_3.isV6OrLater()).isTrue();
     assertThat(ElasticVersion.V6_4.isV6OrLater()).isTrue();
     assertThat(ElasticVersion.V6_5.isV6OrLater()).isTrue();
+    assertThat(ElasticVersion.V6_6.isV6OrLater()).isTrue();
     assertThat(ElasticVersion.V7_0.isV6OrLater()).isTrue();
   }
 
@@ -69,6 +73,7 @@ public class ElasticVersionTest {
     assertThat(ElasticVersion.V6_3.isV7OrLater()).isFalse();
     assertThat(ElasticVersion.V6_4.isV7OrLater()).isFalse();
     assertThat(ElasticVersion.V6_5.isV7OrLater()).isFalse();
+    assertThat(ElasticVersion.V6_6.isV7OrLater()).isFalse();
     assertThat(ElasticVersion.V7_0.isV7OrLater()).isTrue();
   }
 }