diff --git a/shard.yml b/shard.yml
index bc57988..565710d 100644
--- a/shard.yml
+++ b/shard.yml
@@ -4,6 +4,6 @@ version: 0.1.0
 authors:
   - Andrew Hamon <andrew@hamon.cc>
 
-crystal: 0.23.0
+crystal: 0.24.1
 
 license: MIT
diff --git a/src/cox.cr b/src/cox.cr
index 21c93df..8ed4a9c 100644
--- a/src/cox.cr
+++ b/src/cox.cr
@@ -1,5 +1,4 @@
 require "./cox/*"
-require "secure_random"
 
 module Cox
   def self.encrypt(data, nonce : Nonce, recipient_public_key : PublicKey, sender_secret_key : SecretKey)
diff --git a/src/cox/nonce.cr b/src/cox/nonce.cr
index a5d8382..9c1af28 100644
--- a/src/cox/nonce.cr
+++ b/src/cox/nonce.cr
@@ -1,5 +1,5 @@
 require "./lib_sodium"
-require "secure_random"
+require "random/secure"
 
 module Cox
   class Nonce
@@ -14,7 +14,7 @@ module Cox
     end
 
     def self.new
-      new(SecureRandom.random_bytes(NONCE_LENGTH))
+      new(Random::Secure.random_bytes(NONCE_LENGTH))
     end
 
     def pointer