diff --git a/Cargo.toml b/Cargo.toml
index 971a3ae1..8cbbfee3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,13 +12,13 @@ repository = "https://github.com/ruma/ruma-signatures"
 version = "0.4.1"
 
 [dependencies]
-base64 = "0.10.0"
-lazy_static = "1.2.0"
-ring = "0.13.5"
-serde = "1.0.80"
-serde_json = "1.0.33"
+base64 = "0.10.1"
+lazy_static = "1.3.0"
+ring = "0.14.6"
+serde_json = "1.0.39"
 untrusted = "0.6.2"
 url = "1.7.2"
 
-[dev-dependencies]
-serde_derive = "1.0.80"
+[dependencies.serde]
+version = "1.0.90"
+features = ["derive"]
diff --git a/src/lib.rs b/src/lib.rs
index 219f48bd..e2c84e82 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -691,6 +691,7 @@ impl Display for Algorithm {
 #[cfg(test)]
 mod test {
     use base64::decode_config;
+    use serde::Serialize;
     use serde_json::{from_str, to_string, to_value};
 
     use super::{
@@ -753,7 +754,7 @@ mod test {
 
     #[test]
     fn signatures_empty_json() {
-        #[derive(serde_derive::Serialize)]
+        #[derive(Serialize)]
         struct EmptyWithSignatures {
             signatures: Signatures,
         }
@@ -786,13 +787,13 @@ mod test {
 
     #[test]
     fn sign_minimal_json() {
-        #[derive(serde_derive::Serialize)]
+        #[derive(Serialize)]
         struct Alpha {
             one: u8,
             two: String,
         }
 
-        #[derive(serde_derive::Serialize)]
+        #[derive(Serialize)]
         struct ReverseAlpha {
             two: String,
             one: u8,
@@ -873,7 +874,7 @@ mod test {
 
     #[test]
     fn signatures_minimal_json() {
-        #[derive(serde_derive::Serialize)]
+        #[derive(Serialize)]
         struct MinimalWithSignatures {
             one: u8,
             signatures: Signatures,