diff --git a/Cargo.toml b/Cargo.toml
index 9c03a0e1..338553ed 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,13 +11,13 @@ repository = "https://github.com/ruma/ruma-signatures"
 version = "0.4.0"
 
 [dependencies]
-base64 = "0.5.0"
-lazy_static = "0.2.8"
-ring = "0.9.4"
+base64 = "0.10.0"
+lazy_static = "1.2"
+ring = "0.13.3"
 serde = "1.0"
 serde_json = "1.0"
-untrusted = "0.5"
-url = "1.4"
+untrusted = "0.6.2"
+url = "1.7"
 
 [dev-dependencies]
 serde_derive = "1.0"
diff --git a/src/lib.rs b/src/lib.rs
index 62b6e557..d2c4f9b0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -140,7 +140,7 @@ use std::collections::{HashMap, HashSet};
 use std::error::Error as StdError;
 use std::fmt::{Display, Formatter, Result as FmtResult};
 
-use base64::{CharacterSet, Config, LineWrap, decode_config, encode_config};
+use base64::{CharacterSet, Config, decode_config, encode_config};
 use ring::signature::{ED25519, Ed25519KeyPair as RingEd25519KeyPair, verify};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use serde::de::{Error as SerdeError, MapAccess, Unexpected, Visitor};
@@ -155,8 +155,6 @@ lazy_static! {
     static ref BASE64_CONFIG: Config = Config::new(
         CharacterSet::Standard,
         false,
-        false,
-        LineWrap::NoWrap,
     );
 }
 
@@ -193,7 +191,7 @@ pub fn to_canonical_json(value: &Value) -> Result<String, Error> {
     let mut owned_value = value.clone();
 
     {
-        let mut object = owned_value.as_object_mut().expect("safe since we checked above");
+        let object = owned_value.as_object_mut().expect("safe since we checked above");
         object.remove("signatures");
         object.remove("unsigned");
     }