diff --git a/Cargo.lock b/Cargo.lock
index 4da58af..75d9f08 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -344,7 +344,6 @@ dependencies = [
  "bon",
  "isahc",
  "macro_rules_attribute",
- "mime_guess",
  "mockito",
  "multipart",
  "paste",
diff --git a/Cargo.toml b/Cargo.toml
index dcb003b..cdb5325 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ all-features = true
 
 [features]
 client-reqwest = ["trait-async", "dep:reqwest", "dep:tokio", "dep:serde_json"]
-client-ureq = ["trait-sync", "dep:ureq", "dep:multipart", "dep:mime_guess", "dep:serde_json"]
+client-ureq = ["trait-sync", "dep:ureq", "dep:multipart", "dep:serde_json"]
 trait-async = ["dep:async-trait"]
 trait-sync = []
 
@@ -39,7 +39,6 @@ unreadable_literal = "allow"
 async-trait = { version = "0.1", optional = true }
 bon = "3.0.0"
 macro_rules_attribute = "0.2.0"
-mime_guess = { version = "2", optional = true }
 multipart = { version = "0.18", optional = true, default-features = false, features = ["client"] }
 paste = "1.0.2"
 serde = { version = "1.0.157", features = ["derive"] }
diff --git a/src/client_ureq.rs b/src/client_ureq.rs
index 82e4bca..7b6b2d1 100644
--- a/src/client_ureq.rs
+++ b/src/client_ureq.rs
@@ -110,12 +110,7 @@ impl TelegramApi for Bot {
         for (parameter_name, file_path) in &files {
             let file = std::fs::File::open(file_path).map_err(Error::ReadFile)?;
             let file_name = file_path.file_name().unwrap().to_string_lossy();
-            let file_extension = file_path
-                .extension()
-                .and_then(std::ffi::OsStr::to_str)
-                .unwrap_or("");
-            let mime = mime_guess::from_ext(file_extension).first_or_octet_stream();
-            form.add_stream(*parameter_name, file, Some(file_name), Some(mime));
+            form.add_stream(*parameter_name, file, Some(file_name), None);
         }
 
         let url = format!("{}/{method}", self.api_url);