Update commons-codec from 1.14 to 1.15.
diff --git a/pom.xml b/pom.xml
index 4812aa7..dcd94f5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -498,7 +498,7 @@
     <dependency>
       <groupId>commons-codec</groupId>
       <artifactId>commons-codec</artifactId>
-      <version>1.14</version>
+      <version>1.15</version>
       <optional>true</optional>
     </dependency>
   </dependencies>
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 19010fa..56da884 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -195,6 +195,9 @@
     <action type="update" dev="ggregory" due-to="Dependabot">
       Update maven-pmd-plugin from 3.12.0 to 3.13.0 #167.
     </action>
+    <action type="update" dev="ggregory" due-to="Gary Gregory">
+      Update commons-codec from 1.14 to 1.15.
+    </action>
   </release>
   <release version="4.4" date="2019-07-05" description="Maintenance release.">
     <action issue="COLLECTIONS-710" dev="ggregory" type="fix" due-to="Yu Shi, Gary Gregory">