diff --git a/build.gradle b/build.gradle
index 208b4d8..fa3de8e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 subprojects {
     ext.version_number     = "2.5.3"
     ext.group_info         = "org.whispersystems"
-    ext.curve25519_version = "0.3.0"
+    ext.curve25519_version = "0.4.0"
 
     if (JavaVersion.current().isJava8Compatible()) {
         allprojects {