diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
new file mode 100644
index 0000000..5d29a5e
--- /dev/null
+++ b/.devcontainer/Dockerfile
@@ -0,0 +1,8 @@
+FROM mcr.microsoft.com/devcontainers/php:8.2-bullseye
+
+# Install libraries needed to compile GD
+RUN apt-get update \
+ && apt-get install -y libpng-dev libjpeg-dev libfreetype6-dev \
+ && docker-php-ext-configure gd --with-freetype --with-jpeg \
+ && docker-php-ext-install gd \
+ && rm -rf /var/lib/apt/lists/*
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..3af305c
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,12 @@
+{
+  "name": "PHP with GD",
+  "build": { "dockerfile": "Dockerfile" },
+  "postCreateCommand": "composer install",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "felixfbecker.php-intellisense"
+      ]
+    }
+  }
+}
diff --git a/README.md b/README.md
index dabed35..fe580b3 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ composer require --dev meyfa/phpunit-assert-gd
 
 | AssertGD version | Supported PHP version | Supported PHPUnit version |
 |:-----------------|:----------------------|:--------------------------|
-| 4.*              | >= 8.1                | 10.1                      |
+| 4.*              | >= 8.1                | ^10.1 and ^11.0           |
 | 3.*              | >= 7.3                | 9                         |
 | 2.*              | >= 7.2                | 8                         |
 | 1.*              | 5.3.3 - 8.0           | 4.8.36 - 6.5.0            |
@@ -137,4 +137,4 @@ an exact match and 1 is the complete opposite.
 
 You may then provide an instance of the class as the 5th parameter of
 the `assertSimilarGD` or `assertNotSimilarGD` method to use this
-calculation method for determining the image difference.
\ No newline at end of file
+calculation method for determining the image difference.
diff --git a/composer.json b/composer.json
index 1b76bfe..643abf9 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": ">=8.1",
-        "phpunit/phpunit": "^10.1",
+        "phpunit/phpunit": "^10.1|^11.0",
         "ext-gd": "*"
     },
     "require-dev": {