diff --git a/opc-ua-stack/pom.xml b/opc-ua-stack/pom.xml
index 14eac55de4..0bd590a0a6 100644
--- a/opc-ua-stack/pom.xml
+++ b/opc-ua-stack/pom.xml
@@ -22,7 +22,7 @@
     <packaging>pom</packaging>
 
     <properties>
-        <bouncycastle.version>1.75</bouncycastle.version>
+        <bouncycastle.version>1.78.1</bouncycastle.version>
         <guava.version>33.0.0-jre</guava.version>
         <javassist.version>3.23.1-GA</javassist.version>
         <annotations.version>22.0.0</annotations.version>