CertificateExpiredException in WS integration tests

The following two WS tests started failing:

EJBSignEncryptMultipleClientsTestCase.encryptedAndSignedRequestFromJohn
SignEncryptMultipleClientsTestCase.encryptedAndSignedRequestFromJohn
[ERROR] Tests run: 119, Failures: 0, Errors: 2, Skipped: 0

The cause is:

Caused by: org.apache.wss4j.common.ext.WSSecurityException: The provided certificate is invalid
Original Exception was java.security.cert.CertificateExpiredException: NotAfter: Fri May 18 12:48:17 CEST 2018
<------>at org.apache.wss4j.common.crypto.Merlin.verifyTrust(Merlin.java:760)
<------>at org.apache.wss4j.common.crypto.Merlin.verifyTrust(Merlin.java:887)
<------>at org.apache.wss4j.dom.validate.SignatureTrustValidator.verifyTrustInCerts(SignatureTrustValidator.java:109)
<------>at org.apache.wss4j.dom.validate.SignatureTrustValidator.validate(SignatureTrustValidator.java:64)
<------>at org.apache.wss4j.dom.processor.SignatureProcessor.handleToken(SignatureProcessor.java:192)
<------>at org.apache.wss4j.dom.engine.WSSecurityEngine.processSecurityHeader(WSSecurityEngine.java:340)
<------>at org.apache.cxf.ws.security.wss4j.WSS4JInInterceptor.handleMessageInternal(WSS4JInInterceptor.java:285)
<------>... 56 more