diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0abef30..4af5a8c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: [ "8.0", "8.1", "8.2" ]
+        php-version: [ "8.1", "8.2", "8.3" ]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -51,7 +51,7 @@ jobs:
     if: ${{ github.event_name == 'pull_request' }}
     strategy:
       matrix:
-        php-version: [ "8.0", "8.1", "8.2" ]
+        php-version: [ "8.1", "8.2", "8.3" ]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -78,7 +78,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: [ "8.0", "8.1", "8.2" ]
+        php-version: [ "8.1", "8.2", "8.3" ]
         coverage: [ true ]
     steps:
       - name: Checkout
@@ -112,7 +112,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: [ "8.0", "8.1", "8.2" ]
+        php-version: [ "8.1", "8.2", "8.3" ]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/README.md b/README.md
index 46f5cb0..0e0bc00 100644
--- a/README.md
+++ b/README.md
@@ -15,8 +15,8 @@ A library containing my standard development resources to build high quality Wor
 ### Requirements
 
 ```
-PHP >= 8.0
-WordPress >= 6.0
+PHP >= 8.1
+WordPress >= 6.1
 ```
 
 | PHP version      | WP Utilities |
@@ -26,6 +26,7 @@ WordPress >= 6.0
 | 7.3              | 2.0.0        |
 | \>= 7.4          | 2.1.0        |
 | \>= 8.0          | 3.0          |
+| \>= 8.1          | 3.3          |
 
 The required WordPress version will always be the most recent point release of
 the previous major release branch.
@@ -39,7 +40,7 @@ compatibility is entirely coincidental.
 To install this library, use Composer:
 
 ```
-composer require thefrosty/wp-utilities:^3.0
+composer require thefrosty/wp-utilities:^3.3
 ```
 
 Then follow examples in the [Plugin README](./src/Plugin/README.md)
diff --git a/bin/functions.sh b/bin/functions.sh
index 2a6a86b..fa9853c 100644
--- a/bin/functions.sh
+++ b/bin/functions.sh
@@ -6,7 +6,7 @@ set -e
 # https://stackoverflow.com/a/44750379/558561 -- get the default git branch name
 DEFAULT_BRANCH=$(git remote show $(git remote) | sed -n '/HEAD branch/s/.*: //p')
 OTHER_ARGUMENTS=()
-PHP_VERSION=${PHP_VERSION:-"8.0"}
+PHP_VERSION=${PHP_VERSION:-"8.1"}
 
 # Loop through arguments and process them
 # @ref https://pretzelhands.com/posts/command-line-flags/
diff --git a/composer.json b/composer.json
index 0aad4ad..80c190a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,35 +17,35 @@
     },
     "optimize-autoloader": true,
     "platform": {
-      "php": "8.0"
+      "php": "8.1"
     },
     "sort-packages": true
   },
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "php": "^8.0 || ^8.1 || ^8.2",
+    "php": ">=8.1",
     "ext-json": "*",
     "ext-openssl": "*",
-    "johnbillion/args": "^1.1",
-    "psr/container": "^1.0 || ^2.0",
-    "symfony/http-foundation": "^5.2 || ~6.0"
+    "johnbillion/args": "^1.9",
+    "psr/container": "^2.0",
+    "symfony/http-foundation": "^6.0 || ^7.0"
   },
   "require-dev": {
     "ext-simplexml": "*",
     "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
     "phpcompatibility/php-compatibility": "^9.3",
     "phpmd/phpmd": "^2.13",
-    "phpunit/php-code-coverage": "^9.2",
-    "phpunit/phpunit": "^9",
+    "phpunit/php-code-coverage": "^10",
+    "phpunit/phpunit": "^10",
     "pimple/pimple": "^3.5",
-    "roots/wordpress": "^6.2",
+    "roots/wordpress": "^6.4",
     "slevomat/coding-standard": "^8.8",
-    "squizlabs/php_codesniffer": "^3.7",
+    "squizlabs/php_codesniffer": "^3.9",
     "szepeviktor/phpstan-wordpress": "^1.0",
-    "wp-phpunit/wp-phpunit": "^6.2",
+    "wp-phpunit/wp-phpunit": "^6.4",
     "wp-coding-standards/wpcs": "dev-develop",
-    "yoast/phpunit-polyfills": "^1.0.5 || ^2.0"
+    "yoast/phpunit-polyfills": "^2.0"
   },
   "suggest": {
     "jjgrainger/posttypes": "Simple WordPress custom post types."
diff --git a/phpcs.xml b/phpcs.xml
index a005488..5dea917 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -36,6 +36,6 @@
 
     <!-- Loads the PHP Compatibility ruleset. -->
     <rule ref="PHPCompatibility"/>
-    <!-- Check for cross-version support for PHP 8.0 and higher. -->
-    <config name="testVersion" value="8.0-"/>
+    <!-- Check for cross-version support for PHP 8.1 and higher. -->
+    <config name="testVersion" value="8.1-"/>
 </ruleset>
diff --git a/phpunit.xml b/phpunit.xml
index 382e2c5..c689248 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -20,7 +20,7 @@
     </php>
     <testsuites>
         <testsuite name="unit">
-            <directory phpVersion="8.0" phpVersionOperator=">=" suffix="Test.php">./tests/unit</directory>
+            <directory phpVersion="8.1" phpVersionOperator=">=" suffix="Test.php">./tests/unit</directory>
         </testsuite>
     </testsuites>
 </phpunit>