diff --git a/Proton/Sniffs/Architecture/ForbiddenNamespacedFunctionsSniff.php b/Proton/Sniffs/Architecture/ForbiddenNamespacedFunctionsSniff.php
index 8c1b3ae..b6471c7 100644
--- a/Proton/Sniffs/Architecture/ForbiddenNamespacedFunctionsSniff.php
+++ b/Proton/Sniffs/Architecture/ForbiddenNamespacedFunctionsSniff.php
@@ -9,7 +9,7 @@
 
 class ForbiddenNamespacedFunctionsSniff extends ForbiddenFunctionsSniff
 {
-    protected function addError($phpcsFile, $stackPtr, $function, $pattern = null)
+    protected function addError($phpcsFile, $stackPtr, $function, $pattern = null): void
     {
         $fqfn = NamespaceHelper::resolveName($phpcsFile, $function, 'function', $stackPtr);
         $canonicalName = NamespaceHelper::normalizeToCanonicalName($fqfn);
diff --git a/Proton/Sniffs/Spacing/ArrowFunctionSpacingSniff.php b/Proton/Sniffs/Spacing/ArrowFunctionSpacingSniff.php
index d3194b9..48acd70 100644
--- a/Proton/Sniffs/Spacing/ArrowFunctionSpacingSniff.php
+++ b/Proton/Sniffs/Spacing/ArrowFunctionSpacingSniff.php
@@ -9,7 +9,7 @@
 
 class ArrowFunctionSpacingSniff implements Sniff
 {
-    public function register()
+    public function register(): array
     {
         return [T_FN];
     }
diff --git a/composer.json b/composer.json
index 97fad67..9330dd8 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "test": "phpcs --standard=tests/phpcs.xml --report=csv tests | sort -r | cut -f 2,3,4,6 -d ',' > tests/out.csv && diff tests/expected_csv.txt tests/out.csv"
     },
     "require": {
-        "php": "^7.1 || ^8.0",
+        "php": "^7.4 || ^8.0",
         "slevomat/coding-standard": "^7.0",
         "squizlabs/php_codesniffer": "^3.6"
     },