diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 6c06aa6..6102ae4 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -60,9 +60,6 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "7.2"
-          - "7.3"
-          - "7.4"
           - "8.0"
           - "8.1"
 
@@ -128,9 +125,6 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "7.2"
-          - "7.3"
-          - "7.4"
           - "8.0"
           - "8.1"
         operating-system:
diff --git a/composer.json b/composer.json
index 3f3b5ac..ca50d1c 100644
--- a/composer.json
+++ b/composer.json
@@ -9,12 +9,11 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "^7.2 || ^8.0",
+        "php": "^8.0",
+        "ext-ctype": "*",
         "ext-json": "*",
         "brick/math": "^0.8 || ^0.9",
-        "ramsey/collection": "^1.0",
-        "symfony/polyfill-ctype": "^1.8",
-        "symfony/polyfill-php80": "^1.14"
+        "ramsey/collection": "^1.0"
     },
     "replace": {
         "rhumsaa/uuid": "self.version"