diff --git a/composer.json b/composer.json
index 872574a2..a68d0c84 100644
--- a/composer.json
+++ b/composer.json
@@ -51,9 +51,9 @@
         }
     ],
     "require": {
-        "paragonie/constant_time_encoding": "^1|^2",
+        "paragonie/constant_time_encoding": "^1",
         "paragonie/random_compat": "^1.4|^2.0",
-        "php": ">=7.0"
+        "php": ">=5.6"
     },
     "require-dev": {
         "phing/phing": "~2.7",