diff --git a/composer.json b/composer.json
index d8e5e5f0..ecd16d74 100644
--- a/composer.json
+++ b/composer.json
@@ -51,7 +51,7 @@
         }
     ],
     "require": {
-        "paragonie/constant_time_encoding": "^1",
+        "paragonie/constant_time_encoding": "^1|^2",
         "paragonie/random_compat": "^1.4|^2.0",
         "php": ">=5.6.1"
     },