diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62aebd43..a6479ddc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [unreleased]
 
+### Fixed
+
+- `send_contact` signature (`phone_number` and `first_name` `f64` => `String`) ([#56][pr56])
+
+[pr56]: https://github.com/teloxide/teloxide-core/pull/56
 
 ## [0.1.1] - 2020-02-17
 
diff --git a/src/bot/api.rs b/src/bot/api.rs
index 86997994..0cbcf24f 100644
--- a/src/bot/api.rs
+++ b/src/bot/api.rs
@@ -267,9 +267,11 @@ impl Requester for Bot {
 
     type SendContact = JsonRequest<payloads::SendContact>;
 
-    fn send_contact<C>(&self, chat_id: C, phone_number: f64, first_name: f64) -> Self::SendContact
+    fn send_contact<C, P, F>(&self, chat_id: C, phone_number: P, first_name: F) -> Self::SendContact
     where
         C: Into<ChatId>,
+        P: Into<String>,
+        F: Into<String>,
     {
         Self::SendContact::new(
             self.clone(),
diff --git a/src/local_macros.rs b/src/local_macros.rs
index 1129e983..357e17b9 100644
--- a/src/local_macros.rs
+++ b/src/local_macros.rs
@@ -393,7 +393,7 @@ macro_rules! impl_payload {
 }
 
 #[macro_use]
-// This macro is auto generated by `cg` <https://github.com/teloxide/cg> (be02d84).
+// This macro is auto generated by `cg` <https://github.com/teloxide/cg> (8ee7ef2).
 // **DO NOT EDIT THIS MACRO**,
 // edit `cg` instead.
 macro_rules! requester_forward {
@@ -582,9 +582,11 @@ macro_rules! requester_forward {
     (@method send_contact $body:ident $ty:ident) => {
         type SendContact = $ty![SendContact];
 
-        fn send_contact<C>(&self, chat_id: C, phone_number: f64, first_name: f64) -> Self::SendContact where C: Into<ChatId> {
+        fn send_contact<C, P, F>(&self, chat_id: C, phone_number: P, first_name: F) -> Self::SendContact where C: Into<ChatId>,
+        P: Into<String>,
+        F: Into<String> {
             let this = self;
-            $body!(send_contact this (chat_id: C, phone_number: f64, first_name: f64))
+            $body!(send_contact this (chat_id: C, phone_number: P, first_name: F))
         }
     };
     (@method send_poll $body:ident $ty:ident) => {
diff --git a/src/payloads/send_contact.rs b/src/payloads/send_contact.rs
index 215cd02f..f6b464fc 100644
--- a/src/payloads/send_contact.rs
+++ b/src/payloads/send_contact.rs
@@ -9,15 +9,15 @@ impl_payload! {
     /// Use this method to send phone contacts. On success, the sent [`Message`] is returned.
     ///
     /// [`Message`]: crate::types::Message
-    #[derive(Debug, PartialEq, Clone, Serialize)]
+    #[derive(Debug, PartialEq, Eq, Hash, Clone, Serialize)]
     pub SendContact (SendContactSetters) => Message {
         required {
             /// Unique identifier for the target chat or username of the target channel (in the format `@channelusername`)
             pub chat_id: ChatId [into],
             /// Contact's phone number
-            pub phone_number: f64,
+            pub phone_number: String [into],
             /// Contact's first name
-            pub first_name: f64,
+            pub first_name: String [into],
         }
         optional {
             /// Contact's last name
diff --git a/src/requests/requester.rs b/src/requests/requester.rs
index 68ea02b9..0335ca02 100644
--- a/src/requests/requester.rs
+++ b/src/requests/requester.rs
@@ -53,7 +53,7 @@ pub trait Requester {
     /// Error type returned by all requests.
     type Err: std::error::Error + Send;
 
-    // This block is auto generated by `cg` <https://github.com/teloxide/cg> (be02d84).
+    // This block is auto generated by `cg` <https://github.com/teloxide/cg> (8ee7ef2).
     // **DO NOT EDIT THIS BLOCK**,
     // edit `cg` instead.
 
@@ -251,9 +251,16 @@ pub trait Requester {
     type SendContact: Request<Payload = SendContact, Err = Self::Err>;
 
     /// For Telegram documentation see [`SendContact`].
-    fn send_contact<C>(&self, chat_id: C, phone_number: f64, first_name: f64) -> Self::SendContact
+    fn send_contact<C, P, F>(
+        &self,
+        chat_id: C,
+        phone_number: P,
+        first_name: F,
+    ) -> Self::SendContact
     where
-        C: Into<ChatId>;
+        C: Into<ChatId>,
+        P: Into<String>,
+        F: Into<String>;
 
     type SendPoll: Request<Payload = SendPoll, Err = Self::Err>;