diff --git a/composer.json b/composer.json
index 5052d5fb..d996700e 100644
--- a/composer.json
+++ b/composer.json
@@ -52,7 +52,7 @@
     ],
     "require": {
         "php": ">=5.6.1",
-        "paragonie/constant_time_encoding": "^1|^2",
+        "paragonie/constant_time_encoding": "^1|^2|^3",
         "paragonie/random_compat": "^1.4|^2.0|^9.99.99"
     },
     "require-dev": {