diff --git a/bin/main.ml b/bin/main.ml
index e09b116..93dab77 100644
--- a/bin/main.ml
+++ b/bin/main.ml
@@ -2,8 +2,6 @@ open Pusk.Net
 open Pusk.Drivers
 open Pusk.Utils
 
-exception Any of string
-
 let start driver =
   let name_driver = prepare driver in
   let data_driver = run_process name_driver [] in
diff --git a/lib/drivers.ml b/lib/drivers.ml
index b87bb6e..5988b84 100644
--- a/lib/drivers.ml
+++ b/lib/drivers.ml
@@ -15,7 +15,7 @@ let rec download uri dest =
       let uri = Uri.of_string url in
       let redirect_url = Uri.resolve "" uri uri in
       download redirect_url dest
-    | None -> failwith "Redirect location not found")
+    | None -> raise (Any "Redirect location not found"))
   else if Cohttp.Code.is_success code
   then (
     print_endline "Downloading...";
@@ -28,8 +28,8 @@ let rec download uri dest =
     print_endline "Download done!";
     Lwt.return_unit)
   else
-    failwith
-      ("Failed to download file. HTTP status: " ^ Cohttp.Code.string_of_status status)
+    raise
+      (Any ("Failed to download file. HTTP status: " ^ Cohttp.Code.string_of_status status))
 ;;
 
 let download_gecko_driver version output =
diff --git a/lib/net.ml b/lib/net.ml
index 7694378..e5082b8 100644
--- a/lib/net.ml
+++ b/lib/net.ml
@@ -37,10 +37,10 @@ let get_session () =
     let rec find_session_id = function
       | ("sessionId", `String session_id) :: _ -> session_id
       | _ :: rest -> find_session_id rest
-      | [] -> failwith "Session ID not found"
+      | [] -> raise (Any "Session ID not found")
     in
     find_session_id (Yojson.Safe.Util.to_assoc value)
-  | _ -> failwith "get_session | Invalid JSON"
+  | _ -> raise (Any "get_session | Invalid JSON")
 ;;
 
 let close_session id = execute_delete_request (driver id) = "{\"value\":null}"
@@ -61,8 +61,8 @@ let rec wait_for_load session_id =
       then (
         Unix.sleep 1;
         wait_for_load session_id)
-    | _ -> failwith "Error when waiting for page to load")
-  | _ -> failwith "wait_for_load | Invalid JSON"
+    | _ -> raise (Any "Error when waiting for page to load"))
+  | _ -> raise (Any "wait_for_load | Invalid JSON")
 ;;
 
 let navigate ?(wait = true) url session_id =
diff --git a/lib/utils.ml b/lib/utils.ml
index 0417f5e..104fe69 100644
--- a/lib/utils.ml
+++ b/lib/utils.ml
@@ -1,3 +1,5 @@
+exception Any of string
+
 let fmt = Printf.sprintf
 
 let load_dotenv =