diff --git a/libraries-6/pom.xml b/libraries-6/pom.xml
index 7bb6028f17..0f129c27c9 100644
--- a/libraries-6/pom.xml
+++ b/libraries-6/pom.xml
@@ -76,6 +76,11 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
         <dependency>
             <groupId>commons-net</groupId>
             <artifactId>commons-net</artifactId>
@@ -156,6 +161,7 @@
         <renjin.version>RELEASE</renjin.version>
         <rcaller.version>3.0</rcaller.version>
         <rserve.version>1.8.1</rserve.version>
+        <commons-collections4.version>4.4</commons-collections4.version>
         <libphonenumber.version>8.12.9</libphonenumber.version>
     </properties>