diff --git a/crypto/spring-security-crypto.gradle b/crypto/spring-security-crypto.gradle
index b45a20b0d87..a26827998ee 100644
--- a/crypto/spring-security-crypto.gradle
+++ b/crypto/spring-security-crypto.gradle
@@ -3,8 +3,8 @@ apply plugin: 'io.spring.convention.spring-module'
 dependencies {
 	management platform(project(":spring-security-dependencies"))
 	optional 'org.springframework:spring-jcl'
-	optional 'org.bouncycastle:bcpkix-jdk15on'
-	
+	optional 'org.bouncycastle:bcpkix-jdk18on'
+
 	testImplementation "org.assertj:assertj-core"
 	testImplementation "org.junit.jupiter:junit-jupiter-api"
 	testImplementation "org.junit.jupiter:junit-jupiter-params"
diff --git a/dependencies/spring-security-dependencies.gradle b/dependencies/spring-security-dependencies.gradle
index 5a24cbae390..ca9eea0031a 100644
--- a/dependencies/spring-security-dependencies.gradle
+++ b/dependencies/spring-security-dependencies.gradle
@@ -57,8 +57,8 @@ dependencies {
 		api libs.org.aspectj.aspectjrt
 		api libs.org.aspectj.aspectjweaver
 		api libs.org.assertj.assertj.core
-		api libs.org.bouncycastle.bcpkix.jdk15on
-		api libs.org.bouncycastle.bcprov.jdk15on
+		api libs.org.bouncycastle.bcpkix.jdk18on
+		api libs.org.bouncycastle.bcprov.jdk18on
 		api libs.org.eclipse.jetty.jetty.server
 		api libs.org.eclipse.jetty.jetty.servlet
 		api libs.org.hamcrest
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 9b0002d89bc..8319fe25c4c 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -7,7 +7,7 @@ jakarta-websocket = "2.1.1"
 org-apache-directory-server = "1.5.5"
 org-apache-maven-resolver = "1.8.2"
 org-aspectj = "1.9.22.1"
-org-bouncycastle = "1.70"
+org-bouncycastle = "1.78.1"
 org-eclipse-jetty = "11.0.21"
 org-jetbrains-kotlin = "1.8.22"
 org-jetbrains-kotlinx = "1.6.4"
@@ -62,8 +62,8 @@ org-apereo-cas-client-cas-client-core = "org.apereo.cas.client:cas-client-core:4
 org-aspectj-aspectjrt = { module = "org.aspectj:aspectjrt", version.ref = "org-aspectj" }
 org-aspectj-aspectjweaver = { module = "org.aspectj:aspectjweaver", version.ref = "org-aspectj" }
 org-assertj-assertj-core = "org.assertj:assertj-core:3.24.2"
-org-bouncycastle-bcpkix-jdk15on = { module = "org.bouncycastle:bcpkix-jdk15on", version.ref = "org-bouncycastle" }
-org-bouncycastle-bcprov-jdk15on = { module = "org.bouncycastle:bcprov-jdk15on", version.ref = "org-bouncycastle" }
+org-bouncycastle-bcpkix-jdk18on = { module = "org.bouncycastle:bcpkix-jdk18on", version.ref = "org-bouncycastle" }
+org-bouncycastle-bcprov-jdk18on = { module = "org.bouncycastle:bcprov-jdk18on", version.ref = "org-bouncycastle" }
 org-eclipse-jetty-jetty-server = { module = "org.eclipse.jetty:jetty-server", version.ref = "org-eclipse-jetty" }
 org-eclipse-jetty-jetty-servlet = { module = "org.eclipse.jetty:jetty-servlet", version.ref = "org-eclipse-jetty" }
 org-hamcrest = "org.hamcrest:hamcrest:2.2"