diff --git a/libraries/microsoft-agents-authentication-msal/microsoft_agents/authentication/msal/msal_auth.py b/libraries/microsoft-agents-authentication-msal/microsoft_agents/authentication/msal/msal_auth.py
index 8c46a7f9..1d82acec 100644
--- a/libraries/microsoft-agents-authentication-msal/microsoft_agents/authentication/msal/msal_auth.py
+++ b/libraries/microsoft-agents-authentication-msal/microsoft_agents/authentication/msal/msal_auth.py
@@ -227,7 +227,7 @@ def _create_client_application(
                 cert = load_pem_x509_certificate(
                     data=bytes(public_certificate, "UTF-8"), backend=default_backend()
                 )
-                thumbprint = cert.fingerprint(hashes.SHA1()).hex()
+                thumbprint = cert.fingerprint(hashes.SHA256()).hex()
 
                 self._client_credential_cache = {
                     "thumbprint": thumbprint,