diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 4fe2036..b2b86c8 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -11,7 +11,7 @@ ARG USER_GID=${USER_UID}
 RUN groupadd --gid ${USER_GID} ${USERNAME} && \
     useradd -s /bin/bash --uid ${USER_UID} --gid ${USERNAME} -m ${USERNAME}
 
-COPY --from=composer:2.9 /usr/bin/composer /usr/bin/composer
+COPY --from=composer:2.10 /usr/bin/composer /usr/bin/composer
 
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive && \
     bash /tmp/library-scripts/dev.sh "${USERNAME}"
diff --git a/src/TestCase/Example.php b/src/TestCase/Example.php
index e5eb9b8..4a72c5d 100755
--- a/src/TestCase/Example.php
+++ b/src/TestCase/Example.php
@@ -43,7 +43,7 @@ public function expectedOutput(): string
         foreach (\explode(PHP_EOL, $this->code) as $line) {
             \preg_match("/\/\/\s*@prints\s*(?<text>[^\s].*)$/", $line, $matches);
 
-            if (\array_key_exists("text", $matches)) {
+            if ($matches !== []) {
                 $expectedOutput[] = $matches["text"];
             }
         }
@@ -81,7 +81,7 @@ private static function expectedFailureFromLine(string $line): ?ExpectedFailure
     {
         \preg_match("/\/\/\s*@throws\s*(?<class>[^ ]+)\s+(?<message>[^\s].*[^\s])\s*/", $line, $matches);
 
-        if (!\array_key_exists("class", $matches) || !\array_key_exists("message", $matches)) {
+        if ($matches === []) {
             return null;
         }