diff --git a/src/state.rs b/src/state.rs
index 6032642..994ecbf 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -23,10 +23,36 @@ pub struct Creds {
     pub password: Secret<String>,
 }
 
-#[derive(thiserror::Error, Debug)]
-pub enum AuthnError {
-    #[error("{0}")]
-    Eyre(#[from] Error),
+#[derive(Debug)]
+pub struct AuthnError {}
+
+impl std::fmt::Display for AuthnError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str("authentication error");
+        Ok(())
+    }
+}
+
+impl From<Error> for AuthnError {
+    fn from(_value: Error) -> Self {
+        Self {}
+    }
+}
+
+impl std::error::Error for AuthnError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        None
+    }
+
+    fn description(&self) -> &str {
+        "description() is deprecated; use Display"
+    }
+
+    fn cause(&self) -> Option<&dyn std::error::Error> {
+        self.source()
+    }
+
+    fn provide<'a>(&'a self, request: &mut std::error::Request<'a>) {}
 }
 
 #[async_trait]