diff --git a/app/build.gradle b/app/build.gradle
index e50a95f083..8e3415d6f1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -263,7 +263,7 @@ dependencies {
     def photoview_version = "2.3.0"
     def relinker_version = "1.3.1"
     def markwon_version = "4.4.0"
-    def bouncycastle_version = "1.65"
+    def bouncycastle_version = "1.66"
     def colorpicker_version = "0.0.15"
     def appauth_version = "0.7.1"
     def jcharset_version = "2.1"