diff --git a/lib/build.gradle b/lib/build.gradle
index 168a5656..0025f014 100644
--- a/lib/build.gradle
+++ b/lib/build.gradle
@@ -131,7 +131,7 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-core:2.22.2'
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.22.2'
 
-    testImplementation 'org.bouncycastle:bcprov-jdk15on:1.70'
+    testImplementation 'org.bouncycastle:bcprov-jdk18on:1.85.2'
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'net.jodah:concurrentunit:0.4.6'
     testImplementation 'org.hamcrest:hamcrest:2.2'