diff --git a/gradle.properties b/gradle.properties
index 98076b94cca..323e5cd91b9 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -56,7 +56,7 @@ felixSecurityVersion=2.8.3
 guavaVersion=30.1.1-jre
 hibernateVersion=5.6.15.Final
 hikariCpVersion=5.0.1
-jacksonVersion=2.14.2
+jacksonVersion=2.15.0
 jaxbVersion = 2.3.1
 jbossTransactionApiSpecVersion=1.1.1.Final
 jetbrainsAnnotationsVersion=13.0
@@ -100,7 +100,7 @@ jimfsVersion = 1.2
 junit5Version=5.9.2
 junitPlatformVersion=1.9.2
 mockitoKotlinVersion=4.1.0
-mockitoVersion=5.3.0
+mockitoVersion=5.3.1
 osgiTestJunit5Version=1.2.1
 postgresDriverVersion=42.6.0
 slingVersion=3.3.4
diff --git a/libs/rest/rest-server-impl/src/integrationTest/kotlin/net/corda/rest/server/impl/RestServerRequestsTest.kt b/libs/rest/rest-server-impl/src/integrationTest/kotlin/net/corda/rest/server/impl/RestServerRequestsTest.kt
index 6233adad057..ba41e844d96 100644
--- a/libs/rest/rest-server-impl/src/integrationTest/kotlin/net/corda/rest/server/impl/RestServerRequestsTest.kt
+++ b/libs/rest/rest-server-impl/src/integrationTest/kotlin/net/corda/rest/server/impl/RestServerRequestsTest.kt
@@ -8,7 +8,18 @@ import io.javalin.core.util.Header.WWW_AUTHENTICATE
 import net.corda.rest.server.apigen.test.TestJavaPrimitivesRestResourceImpl
 import net.corda.rest.server.config.models.RestServerSettings
 import net.corda.rest.server.impl.apigen.processing.openapi.schema.toExample
-import net.corda.rest.test.*
+import net.corda.rest.test.CustomNonSerializableString
+import net.corda.rest.test.CustomSerializationAPIImpl
+import net.corda.rest.test.CustomUnsafeString
+import net.corda.rest.test.TestEntityRestResourceImpl
+import net.corda.rest.test.TestFileUploadImpl
+import net.corda.rest.test.TestHealthCheckAPIImpl
+import net.corda.rest.test.utils.ChecksumUtil
+import net.corda.rest.test.utils.TestClientFileUpload
+import net.corda.rest.test.utils.TestHttpClientUnirestImpl
+import net.corda.rest.test.utils.WebRequest
+import net.corda.rest.test.utils.WebResponse
+import net.corda.rest.test.utils.multipartDir
 import net.corda.rest.tools.HttpVerb.DELETE
 import net.corda.rest.tools.HttpVerb.GET
 import net.corda.rest.tools.HttpVerb.POST
@@ -23,12 +34,6 @@ import org.junit.jupiter.api.Test
 import java.time.Instant
 import java.time.ZonedDateTime
 import kotlin.test.assertEquals
-import net.corda.rest.test.utils.ChecksumUtil
-import net.corda.rest.test.utils.TestClientFileUpload
-import net.corda.rest.test.utils.TestHttpClientUnirestImpl
-import net.corda.rest.test.utils.WebRequest
-import net.corda.rest.test.utils.WebResponse
-import net.corda.rest.test.utils.multipartDir
 
 class RestServerRequestsTest : RestServerTestBase() {
     companion object {
@@ -360,7 +365,7 @@ class RestServerRequestsTest : RestServerTestBase() {
         val timeCallResponse = client.call(POST, WebRequest<Any>("health/timecall", """ { "time": { "time": "$time" } } """), userName, password)
 
         assertEquals(HttpStatus.SC_OK, timeCallResponse.responseStatus)
-        assertEquals("2020-01-01T11:00Z[UTC]", timeCallResponse.body)
+        assertEquals("2020-01-01T11:00Z", timeCallResponse.body)
     }
 
     @Test
diff --git a/testing/cpbs/sandbox-security-manager-one/build.gradle b/testing/cpbs/sandbox-security-manager-one/build.gradle
index 82f9d15d2ce..e5b8dc6657d 100644
--- a/testing/cpbs/sandbox-security-manager-one/build.gradle
+++ b/testing/cpbs/sandbox-security-manager-one/build.gradle
@@ -17,7 +17,11 @@ cordapp {
 }
 
 dependencies {
-    implementation "com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion"
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion") {
+        // this transitive dependency is not needed as it is shaded in the jackson module, but there is a bug in
+        //  the metadata: https://github.com/FasterXML/jackson-core/issues/999
+        exclude group: "ch.randelshofer"
+    }
 
     cordaProvided platform("net.corda:corda-api:$cordaApiVersion")
     compileOnly "org.osgi:org.osgi.service.component.annotations"
diff --git a/testing/cpbs/sandbox-security-manager-two/build.gradle b/testing/cpbs/sandbox-security-manager-two/build.gradle
index 247b45f8644..19a18b038ba 100644
--- a/testing/cpbs/sandbox-security-manager-two/build.gradle
+++ b/testing/cpbs/sandbox-security-manager-two/build.gradle
@@ -18,7 +18,11 @@ cordapp {
 
 dependencies {
     cordaProvided platform("net.corda:corda-api:$cordaApiVersion")
-    implementation "com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion"
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion") {
+        // this transitive dependency is not needed as it is shaded in the jackson module, but there is a bug in
+        //  the metadata: https://github.com/FasterXML/jackson-core/issues/999
+        exclude group: "ch.randelshofer"
+    }
     compileOnly "org.osgi:org.osgi.service.component.annotations"
     cordaProvided 'org.jetbrains.kotlin:kotlin-osgi-bundle'
     cordaProvided 'net.corda:corda-application'