diff --git a/externalized-properties-core/build.gradle.kts b/externalized-properties-core/build.gradle.kts
index ce93b8c..b9ccdd0 100644
--- a/externalized-properties-core/build.gradle.kts
+++ b/externalized-properties-core/build.gradle.kts
@@ -26,7 +26,7 @@ dependencies {
   testImplementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml")
   testImplementation("com.fasterxml.jackson.dataformat:jackson-dataformat-xml")
   // For testing custom JCE providers with DecryptProcessor.JceDecryptor.
-  testImplementation("org.bouncycastle:bcprov-jdk18on:1.76")
+  testImplementation("org.bouncycastle:bcprov-jdk18on:1.78")
 }
 
 jmh {