diff --git a/.gitignore b/.gitignore
index ecb0601..133dac7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,7 @@ build/
 ### Local secrets and generated files ###
 .env
 effective-pom
+
+### Local dev config, never committed ###
+application-dev.yml
+application-dev.yaml
diff --git a/src/test/java/auth_service/shared/test/AbstractIntegrationTest.java b/src/test/java/auth_service/shared/test/AbstractIntegrationTest.java
index 4740a25..dcf78cb 100644
--- a/src/test/java/auth_service/shared/test/AbstractIntegrationTest.java
+++ b/src/test/java/auth_service/shared/test/AbstractIntegrationTest.java
@@ -4,8 +4,15 @@ import org.junit.jupiter.api.Tag;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
 import org.testcontainers.containers.PostgreSQLContainer;
 
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.util.Base64;
+
 /**
  * Base class for integration tests.
  * Full Spring context with Testcontainers.
@@ -23,5 +30,23 @@ public abstract class AbstractIntegrationTest {
     static {
         postgres.start();
     }
+
+    // No key is committed: a fresh one per JVM.
+    private static final KeyPair KEYS = generateKeys();
+
+    @DynamicPropertySource
+    static void secrets(DynamicPropertyRegistry registry) {
+        registry.add("security.jwt.private-key", () -> Base64.getEncoder().encodeToString(KEYS.getPrivate().getEncoded()));
+        registry.add("security.jwt.public-key", () -> Base64.getEncoder().encodeToString(KEYS.getPublic().getEncoded()));
+        registry.add("auth.registration.invitation-code", () -> "test-invite-code");
+    }
+
+    private static KeyPair generateKeys() {
+        try {
+            return KeyPairGenerator.getInstance("Ed25519").generateKeyPair();
+        } catch (NoSuchAlgorithmException e) {
+            throw new IllegalStateException(e);
+        }
+    }
 }