diff --git a/build-publishing.gradle b/build-publishing.gradle
index bb4c0774..fa53a218 100644
--- a/build-publishing.gradle
+++ b/build-publishing.gradle
@@ -17,7 +17,7 @@ configurations {
   pom
 }
 
-def bouncycastleVersion = "1.50"
+def bouncycastleVersion = "1.66"
 
 dependencies {
   compile "org.slf4j:slf4j-api:1.7.7"
diff --git a/build.gradle b/build.gradle
index 2d1d17f6..17563e7e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -40,7 +40,7 @@ repositories {
 
 configurations.compile.transitive = false
 
-def bouncycastleVersion = "1.65"
+def bouncycastleVersion = "1.66"
 def sshdVersion = "2.1.0"
 
 dependencies {