diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ebe67b..70e9048 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 4.2.1
+
+- (CHG) Allow both v1 and v2 of psr/container
+
 ## 4.2.0
 
 - (CHG) Upgrade to PHP 7.4+ and PHP 8.0
diff --git a/composer.json b/composer.json
index 8474384..1267b04 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     ],
     "require": {
         "php": "^7.4 || ^8.0",
-        "psr/container": "^2.0"
+        "psr/container": "^1.1.1 || ^2.0.2"
     },
     "autoload": {
         "psr-4": {