diff --git a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedConfig.java b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedConfig.java
index bd829a2cdec..29956fcc259 100644
--- a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedConfig.java
+++ b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedConfig.java
@@ -202,7 +202,7 @@ public class DatafeedConfig extends AbstractDiffable<DatafeedConfig> implements
         } else {
             this.headers = Collections.emptyMap();
         }
-        if (in.getVersion().onOrAfter(Version.CURRENT)) {
+        if (in.getVersion().onOrAfter(Version.V_6_6_0)) {
             delayedDataCheckConfig = in.readOptionalWriteable(DelayedDataCheckConfig::new);
         } else {
             delayedDataCheckConfig = DelayedDataCheckConfig.defaultDelayedDataCheckConfig();
@@ -306,7 +306,7 @@ public class DatafeedConfig extends AbstractDiffable<DatafeedConfig> implements
         if (out.getVersion().onOrAfter(Version.V_6_2_0)) {
             out.writeMap(headers, StreamOutput::writeString, StreamOutput::writeString);
         }
-        if (out.getVersion().onOrAfter(Version.CURRENT)) {
+        if (out.getVersion().onOrAfter(Version.V_6_6_0)) {
             out.writeOptionalWriteable(delayedDataCheckConfig);
         }
     }
diff --git a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedUpdate.java b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedUpdate.java
index bfc59687bb5..25a97d081e6 100644
--- a/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedUpdate.java
+++ b/x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/datafeed/DatafeedUpdate.java
@@ -128,7 +128,7 @@ public class DatafeedUpdate implements Writeable, ToXContentObject {
         }
         this.scrollSize = in.readOptionalVInt();
         this.chunkingConfig = in.readOptionalWriteable(ChunkingConfig::new);
-        if (in.getVersion().onOrAfter(Version.CURRENT)) {
+        if (in.getVersion().onOrAfter(Version.V_6_6_0)) {
             delayedDataCheckConfig = in.readOptionalWriteable(DelayedDataCheckConfig::new);
         } else {
             delayedDataCheckConfig = null;
@@ -170,7 +170,7 @@ public class DatafeedUpdate implements Writeable, ToXContentObject {
         }
         out.writeOptionalVInt(scrollSize);
         out.writeOptionalWriteable(chunkingConfig);
-        if (out.getVersion().onOrAfter(Version.CURRENT)) {
+        if (out.getVersion().onOrAfter(Version.V_6_6_0)) {
             out.writeOptionalWriteable(delayedDataCheckConfig);
         }
     }