diff --git a/composer.json b/composer.json
index 7f02513..eb6aa0b 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,9 @@
   "keywords": [ "datadog", "polyfill" ],
   "license": "MIT",
   "type": "library",
+  "require": {
+    "php": ">=7.4"
+  },
   "autoload": {
     "files": [
       "src/DDTrace.php",
diff --git a/src/DDAppsec.php b/src/DDAppsec.php
index 82c74db..65b340c 100644
--- a/src/DDAppsec.php
+++ b/src/DDAppsec.php
@@ -4,11 +4,11 @@
 
 if (!extension_loaded('ddappsec')) {
 
-    function track_user_login_success_event($userId, $metadata)
+    function track_user_login_success_event($userId, $metadata, $automated = null)
     {
     }
 
-    function track_user_login_failure_event($userId, $exist, $metadata)
+    function track_user_login_failure_event($userId, $exists, $metadata, $automated = null)
     {
     }
 
diff --git a/src/DDTrace.php b/src/DDTrace.php
index c7248f8..fe58ce5 100644
--- a/src/DDTrace.php
+++ b/src/DDTrace.php
@@ -4,7 +4,7 @@
 
 if (!extension_loaded('ddtrace')) {
 
-    function add_global_tag($key, $value)
+    function add_global_tag(string $key, string $value)
     {
     }
 
@@ -16,11 +16,11 @@ function root_span()
     {
     }
 
-    function start_span()
+    function start_span(float $startTime = 0)
     {
     }
 
-    function close_span()
+    function close_span(float $finishTime = 0)
     {
     }
 
@@ -28,11 +28,17 @@ function trace_id()
     {
     }
 
-    function trace_method()
+    /**
+     * @param \Closure|array|null $tracingClosureOrConfigArray
+     */
+    function trace_method(
+        string $className,
+        string $methodName,
+        $tracingClosureOrConfigArray = null)
     {
     }
 
-    function set_user($userId, $metadata = [], $propagate = false)
+    function set_user(string $userId, array $metadata = [], ?bool $propagate = null)
     {
     }
 }