diff --git a/src/main/java/eu/europa/ec/dgc/gateway/connector/DgcGatewayConnectorUtils.java b/src/main/java/eu/europa/ec/dgc/gateway/connector/DgcGatewayConnectorUtils.java
index 132bf71..7da1edf 100644
--- a/src/main/java/eu/europa/ec/dgc/gateway/connector/DgcGatewayConnectorUtils.java
+++ b/src/main/java/eu/europa/ec/dgc/gateway/connector/DgcGatewayConnectorUtils.java
@@ -106,7 +106,9 @@ void init() throws KeyStoreException, CertificateEncodingException, IOException
     public boolean trustListItemSignedByCa(TrustListItemDto certificate, X509CertificateHolder ca) {
         ContentVerifierProvider verifier;
         try {
-            verifier = new JcaContentVerifierProviderBuilder().build(ca);
+            verifier = new JcaContentVerifierProviderBuilder()
+                .setProvider(new BouncyCastleProvider())
+                .build(ca);
         } catch (OperatorCreationException | CertificateException e) {
             log.error("Failed to instantiate JcaContentVerifierProvider from cert. KID: {}, Country: {}",
                 certificate.getKid(), certificate.getCountry());