diff --git a/pom.xml b/pom.xml
index 5516d5f..eebc5c1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,7 @@
     </developers>
 
     <properties>
-        <postmark.version>1.1.4</postmark.version>
+        <postmark.version>1.1.5</postmark.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.8</java.version>
         <junit.jupiter.version>5.0.0-M4</junit.jupiter.version>