diff --git a/build.gradle.kts b/build.gradle.kts
index 8bbc8be..c99c55c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -22,7 +22,7 @@ dependencies {
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
     
     // Integration test dependencies
-    testImplementation("org.bouncycastle:bcprov-jdk18on:1.77")
+    testImplementation("org.bouncycastle:bcprov-jdk18on:1.81")
     testImplementation("org.springframework.security:spring-security-crypto:6.2.1")
     testImplementation("commons-logging:commons-logging:1.3.0")
 }