diff --git a/lib/charms/tls_certificates_interface/v3/tls_certificates.py b/lib/charms/tls_certificates_interface/v3/tls_certificates.py
index 141412b0..8cab7133 100644
--- a/lib/charms/tls_certificates_interface/v3/tls_certificates.py
+++ b/lib/charms/tls_certificates_interface/v3/tls_certificates.py
@@ -318,7 +318,7 @@ def _on_all_certificates_invalidated(self, event: AllCertificatesInvalidatedEven
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 23
+LIBPATCH = 24
 
 PYDEPS = ["cryptography", "jsonschema"]
 
@@ -526,7 +526,7 @@ def chain_as_pem(self) -> str:
 class CertificateExpiringEvent(EventBase):
     """Charm Event triggered when a TLS certificate is almost expired."""
 
-    def __init__(self, handle, certificate: str, expiry: str):
+    def __init__(self, handle: Handle, certificate: str, expiry: str):
         """CertificateExpiringEvent.
 
         Args: