diff --git a/dist/pom.xml b/dist/pom.xml
index d3f639eec784..888e69b4bde9 100644
--- a/dist/pom.xml
+++ b/dist/pom.xml
@@ -51,12 +51,8 @@
         <snapshot.buildvers>
             314,
             322,
-            330
-            <!--
-                Remove 340 now due to https://github.com/NVIDIA/spark-rapids/issues/5688.
-                Need to add it back when #5688 is fixed
-            -->
-            <!-- 340 -->
+            330,
+            340
         </snapshot.buildvers>
         <databricks.buildvers>
             312db,
diff --git a/jenkins/spark-premerge-build.sh b/jenkins/spark-premerge-build.sh
index 42c72e22ca72..0cff2cd5c516 100755
--- a/jenkins/spark-premerge-build.sh
+++ b/jenkins/spark-premerge-build.sh
@@ -50,8 +50,7 @@ mvn_verify() {
     env -u SPARK_HOME mvn -U -B $MVN_URM_MIRROR -Dbuildver=321 clean install -Drat.skip=true -DskipTests -Dmaven.javadoc.skip=true -Dskip -Dmaven.scalastyle.skip=true -Dcuda.version=$CUDA_CLASSIFIER -pl aggregator -am
     [[ $BUILD_SNAPSHOTS == "true" ]] && env -u SPARK_HOME mvn -U -B $MVN_URM_MIRROR -Dbuildver=322 clean install -Drat.skip=true -DskipTests -Dmaven.javadoc.skip=true -Dskip -Dmaven.scalastyle.skip=true -Dcuda.version=$CUDA_CLASSIFIER -pl aggregator -am
     env -u SPARK_HOME mvn -U -B $MVN_URM_MIRROR -Dbuildver=330 clean install -Drat.skip=true -DskipTests -Dmaven.javadoc.skip=true -Dskip -Dmaven.scalastyle.skip=true -Dcuda.version=$CUDA_CLASSIFIER -pl aggregator -am
-    # Skip 340 now due to https://github.com/NVIDIA/spark-rapids/issues/5688. Need to enable it when #5688 is fixed
-    # [[ $BUILD_SNAPSHOTS == "true" ]] && env -u SPARK_HOME mvn -U -B $MVN_URM_MIRROR -Dbuildver=340 clean install -Drat.skip=true -DskipTests -Dmaven.javadoc.skip=true -Dskip -Dmaven.scalastyle.skip=true -Dcuda.version=$CUDA_CLASSIFIER -pl aggregator -am
+    [[ $BUILD_SNAPSHOTS == "true" ]] && env -u SPARK_HOME mvn -U -B $MVN_URM_MIRROR -Dbuildver=340 clean install -Drat.skip=true -DskipTests -Dmaven.javadoc.skip=true -Dskip -Dmaven.scalastyle.skip=true -Dcuda.version=$CUDA_CLASSIFIER -pl aggregator -am
 
     # Here run Python integration tests tagged with 'premerge_ci_1' only, that would help balance test duration and memory
     # consumption from two k8s pods running in parallel, which executes 'mvn_verify()' and 'ci_2()' respectively.
diff --git a/jenkins/version-def.sh b/jenkins/version-def.sh
index a67f7f763076..b0b21382b6c0 100755
--- a/jenkins/version-def.sh
+++ b/jenkins/version-def.sh
@@ -48,9 +48,8 @@ SPARK_REPO=${SPARK_REPO:-"$URM_URL"}
 echo "CUDF_VER: $CUDF_VER, CUDA_CLASSIFIER: $CUDA_CLASSIFIER, PROJECT_VER: $PROJECT_VER \
     SPARK_VER: $SPARK_VER, SCALA_BINARY_VER: $SCALA_BINARY_VER"
 
-# Remove 340 now due to https://github.com/NVIDIA/spark-rapids/issues/5688.
-# Need to add it back when #5688 is fixed
-SPARK_SHIM_VERSIONS_STR=${SPARK_SHIM_VERSIONS_STR:-"311 321cdh 312 313 314 320 321 322 330"}
+
+SPARK_SHIM_VERSIONS_STR=${SPARK_SHIM_VERSIONS_STR:-"311 321cdh 312 313 314 320 321 322 330 340"}
 
 IFS=" " <<< $SPARK_SHIM_VERSIONS_STR read -r -a SPARK_SHIM_VERSIONS
 
diff --git a/tests/src/test/scala/com/nvidia/spark/rapids/CastOpSuite.scala b/tests/src/test/scala/com/nvidia/spark/rapids/CastOpSuite.scala
index fc6c47148d32..62cbc197933c 100644
--- a/tests/src/test/scala/com/nvidia/spark/rapids/CastOpSuite.scala
+++ b/tests/src/test/scala/com/nvidia/spark/rapids/CastOpSuite.scala
@@ -342,7 +342,6 @@ class CastOpSuite extends GpuExpressionTestSuite {
       "org.apache.spark.sql.catalyst.expressions.Cast"
     }
     Class.forName(keyString).asInstanceOf[Class[Expression]]
-    //Class.forName(keyString)
   }
 
   private def getUnsupportedCasts(ansiEnabled: Boolean): Seq[(DataType, DataType)] = {