diff --git a/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestIndexMonitorAction.kt b/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestIndexMonitorAction.kt
index 5f753edd1..b903930f4 100644
--- a/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestIndexMonitorAction.kt
+++ b/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestIndexMonitorAction.kt
@@ -18,6 +18,7 @@ import org.opensearch.commons.alerting.model.BucketLevelTrigger
 import org.opensearch.commons.alerting.model.DocLevelMonitorInput
 import org.opensearch.commons.alerting.model.DocumentLevelTrigger
 import org.opensearch.commons.alerting.model.Monitor
+import org.opensearch.commons.alerting.model.PPLTrigger
 import org.opensearch.commons.alerting.model.QueryLevelTrigger
 import org.opensearch.commons.alerting.model.ScheduledJob
 import org.opensearch.commons.alerting.util.AlertingException
@@ -30,7 +31,6 @@ import org.opensearch.core.xcontent.XContentParser.Token
 import org.opensearch.core.xcontent.XContentParserUtils.ensureExpectedToken
 import org.opensearch.index.seqno.SequenceNumbers
 import org.opensearch.rest.BaseRestHandler
-import org.opensearch.rest.BaseRestHandler.RestChannelConsumer
 import org.opensearch.rest.BytesRestResponse
 import org.opensearch.rest.RestChannel
 import org.opensearch.rest.RestHandler.ReplacedRoute
@@ -135,6 +135,14 @@ class RestIndexMonitorAction : BaseRestHandler() {
                             }
                         }
                     }
+
+                    Monitor.MonitorType.PPL_MONITOR -> {
+                        triggers.forEach {
+                            if (it !is PPLTrigger) {
+                                throw IllegalArgumentException("Illegal trigger type, ${it.javaClass.name}, for PPL monitor")
+                            }
+                        }
+                    }
                 }
             }
         } catch (e: Exception) {
diff --git a/build.gradle b/build.gradle
index ca13dade9..8790e3d7d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
     apply from: 'build-tools/repositories.gradle'
 
     ext {
-        opensearch_version = System.getProperty("opensearch.version", "3.5.0-SNAPSHOT")
+        opensearch_version = System.getProperty("opensearch.version", "3.5.1-SNAPSHOT")
         buildVersionQualifier = System.getProperty("build.version_qualifier", "")
         isSnapshot = "true" == System.getProperty("build.snapshot", "true")
         // 3.0.0-SNAPSHOT -> 3.0.0.0-SNAPSHOT
@@ -125,6 +125,9 @@ allprojects {
             force "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${kotlin_version}"
             force "org.jetbrains.kotlin:kotlin-stdlib-jdk7:${kotlin_version}"
             force "org.jetbrains.kotlin:kotlin-reflect:${kotlin_version}"
+//            force "org.apache.logging.log4j:log4j-api:2.25.4"
+//            force "org.apache.logging.log4j:log4j-core:2.25.4"
+//            force "org.apache.httpcomponents.client5:httpclient5:5.6.1"
         }
     }