diff --git a/modules/keycloak/testcontainers/keycloak/__init__.py b/modules/keycloak/testcontainers/keycloak/__init__.py
index e7a065211..21ffc4231 100644
--- a/modules/keycloak/testcontainers/keycloak/__init__.py
+++ b/modules/keycloak/testcontainers/keycloak/__init__.py
@@ -20,6 +20,10 @@
 from testcontainers.core.waiting_utils import wait_container_is_ready, wait_for_logs
 
 _DEFAULT_DEV_COMMAND = "start-dev"
+# Since Keycloak v26.0.0
+# See: https://www.keycloak.org/server/all-config#category-bootstrap_admin
+ADMIN_USERNAME_ENVIRONMENT_VARIABLE = "KC_BOOTSTRAP_ADMIN_USERNAME"
+ADMIN_PASSWORD_ENVIRONMENT_VARIABLE = "KC_BOOTSTRAP_ADMIN_PASSWORD"
 
 
 class KeycloakContainer(DockerContainer):
@@ -57,6 +61,9 @@ def __init__(
         self.cmd = cmd
 
     def _configure(self) -> None:
+        self.with_env(ADMIN_USERNAME_ENVIRONMENT_VARIABLE, self.username)
+        self.with_env(ADMIN_PASSWORD_ENVIRONMENT_VARIABLE, self.password)
+        # legacy env vars (<= 26.0.0)
         self.with_env("KEYCLOAK_ADMIN", self.username)
         self.with_env("KEYCLOAK_ADMIN_PASSWORD", self.password)
         # Enable health checks
@@ -89,7 +96,8 @@ def _readiness_probe(self) -> None:
             response = requests.get(f"{self.get_url()}/health/ready", timeout=1)
         response.raise_for_status()
         if _DEFAULT_DEV_COMMAND in self._command:
-            wait_for_logs(self, "Added user .* to realm .*")
+            wait_for_logs(self, "started in \\d+\\.\\d+s")
+            wait_for_logs(self, "Created temporary admin user|Added user '")
 
     def start(self) -> "KeycloakContainer":
         super().start()
diff --git a/modules/keycloak/tests/test_keycloak.py b/modules/keycloak/tests/test_keycloak.py
index 6bf003b74..24f533d11 100644
--- a/modules/keycloak/tests/test_keycloak.py
+++ b/modules/keycloak/tests/test_keycloak.py
@@ -2,7 +2,7 @@
 from testcontainers.keycloak import KeycloakContainer
 
 
-@pytest.mark.parametrize("image_version", ["25.0", "24.0.1", "18.0"])
+@pytest.mark.parametrize("image_version", ["26.0.0", "25.0", "24.0.1", "18.0"])
 def test_docker_run_keycloak(image_version: str):
     with KeycloakContainer(f"quay.io/keycloak/keycloak:{image_version}") as keycloak_admin:
         assert keycloak_admin.get_client().users_count() == 1