diff --git a/libs/sparkpost-lib/pom.xml b/libs/sparkpost-lib/pom.xml
index e662047..b31041d 100644
--- a/libs/sparkpost-lib/pom.xml
+++ b/libs/sparkpost-lib/pom.xml
@@ -25,7 +25,7 @@
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.5.3</version>
+			<version>4.5.13</version>
 		</dependency>
 
 		<!-- the following two dependencies are required for correct jmockit operation