diff --git a/pom.xml b/pom.xml
index 626d9b6c..1851608c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,32 +18,32 @@
 	</modules>
 
 	<properties>
-		<maven.antora-version>1.0.0-alpha.4</maven.antora-version>
-		<antora.version>0.0.3</antora.version>
-		<assertj-core.version>3.26.3</assertj-core.version>
-		<aws-java-sdk.version>2.21.46</aws-java-sdk.version>
-		<bcpkix-jdk15on.version>1.70</bcpkix-jdk15on.version>
+		<maven.antora-version>1.0.0-alpha.5</maven.antora-version>
+		<antora.version>0.0.4</antora.version>
+		<assertj-core.version>3.27.3</assertj-core.version>
+		<aws-java-sdk.version>2.31.29</aws-java-sdk.version>
+		<bcpkix-jdk18on.version>1.80</bcpkix-jdk18on.version>
 		<google-api-services-iam.version>v1-rev20221013-2.0.0
 		</google-api-services-iam.version>
-		<google-cloud-iamcredentials.version>2.24.0</google-cloud-iamcredentials.version>
-		<google-auth-library-oauth2-http.version>1.20.0
+		<google-cloud-iamcredentials.version>2.60.0</google-cloud-iamcredentials.version>
+		<google-auth-library-oauth2-http.version>1.33.1
 		</google-auth-library-oauth2-http.version>
-		<httpclient5.version>5.3.1</httpclient5.version>
-		<httpcore5.version>5.2.5</httpcore5.version>
-		<jackson-databind.version>2.15.4</jackson-databind.version>
-		<jetty-reactive-httpclient.version>4.0.6</jetty-reactive-httpclient.version>
+		<httpclient5.version>5.4.4</httpclient5.version>
+		<httpcore5.version>5.3.4</httpcore5.version>
+		<jackson-databind.version>2.18.3</jackson-databind.version>
+		<jetty-reactive-httpclient.version>4.0.9</jetty-reactive-httpclient.version>
 		<json-path.version>2.9.0</json-path.version>
-		<junit.version>5.10.3</junit.version>
-		<kotlin.version>1.8.22</kotlin.version>
-		<kotlin-coroutines.version>1.7.3</kotlin-coroutines.version>
-		<mockk.version>1.13.12</mockk.version>
-		<mockito-core.version>5.12.0</mockito-core.version>
-		<netty.version>4.1.112.Final</netty.version>
+		<junit.version>5.12.2</junit.version>
+		<kotlin.version>1.9.22</kotlin.version>
+		<kotlin-coroutines.version>1.9.0</kotlin-coroutines.version>
+		<mockk.version>1.13.17</mockk.version>
+		<mockito-core.version>5.17.0</mockito-core.version>
+		<netty.version>4.1.121.Final</netty.version>
 		<okhttp3.version>3.14.9</okhttp3.version>
 		<spring.version>6.2.0-M6</spring.version>
 		<spring-data-bom.version>2023.1.2</spring-data-bom.version>
-		<spring-security-bom.version>6.2.0</spring-security-bom.version>
-		<reactor.version>2023.0.2</reactor.version>
+		<spring-security-bom.version>6.4.5</spring-security-bom.version>
+		<reactor.version>2024.0.5</reactor.version>
 
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<java.version>17</java.version>
@@ -260,8 +260,8 @@
 
 			<dependency>
 				<groupId>org.bouncycastle</groupId>
-				<artifactId>bcpkix-jdk15on</artifactId>
-				<version>${bcpkix-jdk15on.version}</version>
+				<artifactId>bcpkix-jdk18on</artifactId>
+				<version>${bcpkix-jdk18on.version}</version>
 				<optional>true</optional>
 			</dependency>
 
diff --git a/spring-vault-core/pom.xml b/spring-vault-core/pom.xml
index 0a448d72..4d59af60 100644
--- a/spring-vault-core/pom.xml
+++ b/spring-vault-core/pom.xml
@@ -233,7 +233,7 @@
 
 		<dependency>
 			<groupId>org.bouncycastle</groupId>
-			<artifactId>bcpkix-jdk15on</artifactId>
+			<artifactId>bcpkix-jdk18on</artifactId>
 			<optional>true</optional>
 		</dependency>
 
diff --git a/spring-vault-core/src/test/java/org/springframework/vault/authentication/GcpIamCredentialsAuthenticationUnitTests.java b/spring-vault-core/src/test/java/org/springframework/vault/authentication/GcpIamCredentialsAuthenticationUnitTests.java
index 39907d23..1cfd7ea4 100644
--- a/spring-vault-core/src/test/java/org/springframework/vault/authentication/GcpIamCredentialsAuthenticationUnitTests.java
+++ b/spring-vault-core/src/test/java/org/springframework/vault/authentication/GcpIamCredentialsAuthenticationUnitTests.java
@@ -16,6 +16,9 @@
 package org.springframework.vault.authentication;
 
 import java.io.IOException;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
 import java.security.PrivateKey;
 import java.time.Duration;
 import java.time.Instant;
@@ -103,7 +106,7 @@ class GcpIamCredentialsAuthenticationUnitTests {
 	}
 
 	@Test
-	void shouldLogin() {
+	void shouldLogin() throws NoSuchAlgorithmException {
 		this.serverCall = ((request, responseObserver) -> {
 			SignJwtResponse signJwtResponse = SignJwtResponse.newBuilder()
 				.setSignedJwt("my-jwt")
@@ -121,11 +124,14 @@ class GcpIamCredentialsAuthenticationUnitTests {
 				.body("{" + "\"auth\":{\"client_token\":\"my-token\", \"renewable\": true, \"lease_duration\": 10}"
 						+ "}"));
 
-		PrivateKey privateKeyMock = mock(PrivateKey.class);
+		KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
+		kpg.initialize(2048);
+		KeyPair kp = kpg.generateKeyPair();
+
 		ServiceAccountCredentials credential = (ServiceAccountCredentials) ServiceAccountCredentials.newBuilder()
 			.setClientEmail("hello@world")
 			.setProjectId("foobar")
-			.setPrivateKey(privateKeyMock)
+			.setPrivateKey(kp.getPrivate())
 			.setPrivateKeyId("key-id")
 			.setAccessToken(new AccessToken("foobar", Date.from(Instant.now().plus(1, ChronoUnit.DAYS))))
 			.build();