diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 4051eeb..90b0ce4 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -7,7 +7,7 @@ junit = "4.13.2"
 truth = "1.4.5"
 detekt = "1.23.8"
 ktlint = "12.1.1"
-bouncycastle = "1.84"
+bouncycastle = "1.85"
 
 # Android + Compose toolchain (matches walt-android consumer to avoid drift).
 androidxCoreKtx = "1.17.0"