diff --git a/build.sbt b/build.sbt
index 78cbca6e..0431c9ce 100644
--- a/build.sbt
+++ b/build.sbt
@@ -143,7 +143,6 @@ lazy val api = (project in file("api"))
       Dependencies.macWireProxy,
       Dependencies.yaml,
       Dependencies.cronUtils,
-      Dependencies.threeten,
       Dependencies.jsonValidate,
       Dependencies.iteratees,
       Dependencies.playAhcWS,
@@ -174,7 +173,6 @@ lazy val jobs = (project in file("jobs"))
       Dependencies.macWireMacros,
       Dependencies.macWireUtil,
       Dependencies.macWireProxy,
-      Dependencies.threeten,
       Dependencies.cronUtils,
       Dependencies.akka,
       Dependencies.twitterCommons,
diff --git a/changelog.md b/changelog.md
index 4387b709..089e2d73 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,6 +2,7 @@
 
 # 0.6.NEXT
 
+* Updated to the latest version of cron-utils `9.0.0` and removed threeten-backport.  This fixes a number of cron related issues in the underlying dependencies.
 * When querying run detail with `embed=history`, `successfulFinishedRuns` and `failedFinishedRuns` contains new field `tasks` which is an array of taskIds of that finished run. This will allow people to query task ids even for finished job runs.
 * Fixed a bug when task status was not updated after the task turned running (when querying embed=activeRuns).
 * [DCOS_OSS-5166](https://jira.mesosphere.com/browse/DCOS_OSS-5166) Fixed metronome not using revive operation
diff --git a/jobs/src/main/scala/dcos/metronome/model/CronSpec.scala b/jobs/src/main/scala/dcos/metronome/model/CronSpec.scala
index c9855279..86ef2cfd 100644
--- a/jobs/src/main/scala/dcos/metronome/model/CronSpec.scala
+++ b/jobs/src/main/scala/dcos/metronome/model/CronSpec.scala
@@ -1,16 +1,15 @@
 package dcos.metronome
 package model
 
-import java.time.{ Instant, ZoneId, ZonedDateTime }
+import java.time.ZonedDateTime
 
-import com.cronutils.model.definition.{ CronConstraint, CronDefinition, CronDefinitionBuilder }
-import com.cronutils.model.time.ExecutionTime
 import com.cronutils.model.Cron
+import com.cronutils.model.definition.{ CronConstraint, CronDefinition, CronDefinitionBuilder }
 import com.cronutils.model.field.expression.{ Between, On }
 import com.cronutils.model.field.value.IntegerFieldValue
 import com.cronutils.model.field.{ CronField, CronFieldName }
+import com.cronutils.model.time.ExecutionTime
 import com.cronutils.parser.CronParser
-import org.threeten.bp.{ Instant => ThreeTenInstant, ZoneId => ThreeTenZoneId, ZonedDateTime => ThreeTenZonedDateTime }
 
 import scala.util.control.NonFatal
 
@@ -19,21 +18,11 @@ class CronSpec(val cron: Cron) {
   private[this] lazy val executionTime: ExecutionTime = ExecutionTime.forCron(cron)
 
   def nextExecution(from: ZonedDateTime): ZonedDateTime = {
-    val fromDateTime: ThreeTenZonedDateTime = javaTimeToThreetenTime(from)
-    executionTime.nextExecution(threetenToJavaTime(fromDateTime)).get()
+    executionTime.nextExecution(from).get()
   }
 
   def lastExecution(from: ZonedDateTime): ZonedDateTime = {
-    val fromDateTime: ThreeTenZonedDateTime = javaTimeToThreetenTime(from)
-    executionTime.lastExecution(threetenToJavaTime(fromDateTime)).get()
-  }
-
-  private def threetenToJavaTime(from: ThreeTenZonedDateTime): ZonedDateTime = {
-    ZonedDateTime.ofInstant(Instant.ofEpochMilli(from.toInstant.toEpochMilli), ZoneId.of(from.getZone.getId))
-  }
-
-  private def javaTimeToThreetenTime(from: ZonedDateTime): ThreeTenZonedDateTime = {
-    ThreeTenZonedDateTime.ofInstant(ThreeTenInstant.ofEpochMilli(from.toInstant.toEpochMilli), ThreeTenZoneId.of(from.getZone.toString))
+    executionTime.lastExecution(from).get()
   }
 
   override def hashCode(): Int = cron.hashCode()
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 386abb65..8ab120f4 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -12,8 +12,7 @@ object Dependencies {
     val PlayJson = "2.6.10"
     val ScalaTestPlusPlay = "3.1.2"
     val PlayIteratees = "2.6.1"
-    val CronUtils = "7.0.5"
-    val Threeten = "1.3.3"
+    val CronUtils = "9.0.0"
     val WixAccord = "0.7.1"
     val Akka = "2.5.15"
     val Mockito = "2.21.0"
@@ -36,7 +35,6 @@ object Dependencies {
   val marathon = "mesosphere.marathon" %% "marathon" % V.Marathon exclude("com.typesafe.play", "*") exclude("mesosphere.marathon", "ui") exclude("mesosphere", "chaos") exclude("org.apache.hadoop", "hadoop-hdfs") exclude("org.apache.hadoop", "hadoop-common") exclude("mesosphere.marathon", "plugin-interface_2.12")
   val marathonPlugin = "mesosphere.marathon" %% "plugin-interface" % V.MarathonPluginInterface
   val cronUtils = "com.cronutils" % "cron-utils" % V.CronUtils exclude("org.threeten", "threetenbp")
-  val threeten = "org.threeten" % "threetenbp" % V.Threeten
   val wixAccord = "com.wix" %% "accord-core" % V.WixAccord
   val akka = "com.typesafe.akka" %%  "akka-actor" % V.Akka
   val jsonValidate = "com.eclipsesource" %% "play-json-schema-validator" % V.JsonValidate