diff --git a/build.gradle b/build.gradle
index a7b469c0..073854d0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -95,7 +95,7 @@ if (project.hasProperty("signing.keyId")) {
 
 dependencies {
     compile group: 'org.bitcoinj', name: 'bitcoinj-core', version: '0.15.6'
-    compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.62'
+    compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.64'
     compile group: 'com.google.code.gson', name: 'gson', version: '2.8.6'
     compile 'com.google.guava:guava:28.0-jre'