diff --git a/pom.xml b/pom.xml
index 9466e8b43..6644d298b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -125,8 +125,8 @@ Copyright (c) 2012 - Jeremy Long
         <!-- new versions of lucene are compiled with JDK 1.7 and cannot be used ubiquitously in Jenkins
         thus, we cannot upgrade beyond 4.7.2 -->
         <apache.lucene.version>4.7.2</apache.lucene.version>
-        <slf4j.version>1.7.19</slf4j.version>
-        <logback.version>1.1.6</logback.version>
+        <slf4j.version>1.7.20</slf4j.version>
+        <logback.version>1.1.7</logback.version>
         <reporting.checkstyle-plugin.version>2.17</reporting.checkstyle-plugin.version>
         <reporting.cobertura-plugin.version>2.7</reporting.cobertura-plugin.version>
         <reporting.pmd-plugin.version>3.6</reporting.pmd-plugin.version>
@@ -651,6 +651,11 @@ Copyright (c) 2012 - Jeremy Long
                 <artifactId>maven-reporting-api</artifactId>
                 <version>3.0</version>
             </dependency>
+            <dependency>
+                <groupId>commons-collections</groupId>
+                <artifactId>commons-collections</artifactId>
+                <version>3.2.2</version>
+            </dependency>
             <dependency>
                 <groupId>org.apache.velocity</groupId>
                 <artifactId>velocity</artifactId>