diff --git a/mnemonic/pom.xml b/mnemonic/pom.xml
index 67a22e22..ed36b631 100644
--- a/mnemonic/pom.xml
+++ b/mnemonic/pom.xml
@@ -45,8 +45,8 @@
     <dependencies>
         <dependency>
             <groupId>org.bouncycastle</groupId>
-            <artifactId>bcprov-jdk15on</artifactId>
-            <version>1.70</version>
+            <artifactId>bcprov-jdk18on</artifactId>
+            <version>1.78.1</version>
         </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>