diff --git a/composer.json b/composer.json
index acfbe91..f200d4b 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
         "amphp/sync": "^2",
         "amphp/serialization": "^1",
         "amphp/cache": "^2",
-        "paragonie/constant_time_encoding": "^2.2"
+        "paragonie/constant_time_encoding": "^2 || ^3"
     },
     "require-dev": {
         "amphp/redis": "^2",