diff --git a/examples/als/pom.xml b/examples/als/pom.xml
index c064d6717..1fac8782f 100644
--- a/examples/als/pom.xml
+++ b/examples/als/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.2.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/examples/correlation/pom.xml b/examples/correlation/pom.xml
index ae9092fb9..9d83e32b5 100644
--- a/examples/correlation/pom.xml
+++ b/examples/correlation/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.2.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/examples/kmeans/pom.xml b/examples/kmeans/pom.xml
index 01c0016dd..94666cb65 100644
--- a/examples/kmeans/pom.xml
+++ b/examples/kmeans/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.2.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/examples/linear-regression/pom.xml b/examples/linear-regression/pom.xml
index efa4e59db..613373507 100644
--- a/examples/linear-regression/pom.xml
+++ b/examples/linear-regression/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.2.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/examples/naive-bayes/pom.xml b/examples/naive-bayes/pom.xml
index 13f91d75e..305e6dcad 100644
--- a/examples/naive-bayes/pom.xml
+++ b/examples/naive-bayes/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.2.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/examples/pca/pom.xml b/examples/pca/pom.xml
index 4db4ecc18..0e549170c 100644
--- a/examples/pca/pom.xml
+++ b/examples/pca/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.2.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/examples/summarizer/pom.xml b/examples/summarizer/pom.xml
index b9973c0e7..885f2da0f 100644
--- a/examples/summarizer/pom.xml
+++ b/examples/summarizer/pom.xml
@@ -13,7 +13,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <oap.version>1.3.0</oap.version>
-    <scala.version>2.12.10</scala.version>
+    <scala.version>2.12.15</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <spark.version>3.2.0</spark.version>
   </properties>
@@ -23,7 +23,7 @@
     <dependency>
       <groupId>org.scala-lang</groupId>
       <artifactId>scala-library</artifactId>
-      <version>2.12.10</version>
+      <version>${scala.version}</version>
     </dependency>
 
     <dependency>
diff --git a/mllib-dal/pom.xml b/mllib-dal/pom.xml
index 5b14ed887..eb07716f4 100644
--- a/mllib-dal/pom.xml
+++ b/mllib-dal/pom.xml
@@ -13,7 +13,7 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <scala.version>2.12.10</scala.version>
+        <scala.version>2.12.15</scala.version>
         <scala.binary.version>2.12</scala.binary.version>
         <scalatest.version>3.2.9</scalatest.version>
         <spark.version>3.2.0</spark.version>
@@ -57,7 +57,7 @@
         <dependency>
             <groupId>org.scala-lang</groupId>
             <artifactId>scala-library</artifactId>
-            <version>2.12.10</version>
+            <version>${scala.version}</version>
         </dependency>
         <dependency>
             <groupId>com.github.scopt</groupId>