diff --git a/CHANGELOG.md b/CHANGELOG.md
index e90ac7c8..7d5f6e23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Deprecated
 
+- Deprecate `::atRuleArgs()` (#1191)
 - Deprecate extending `OutputFormat` (#1131)
 - Deprecate `OutputFormat::get()` and `::set()` (#1107)
 - Deprecate support for `-webkit-calc` and `-moz-calc` (#1086)
diff --git a/src/CSSList/AtRuleBlockList.php b/src/CSSList/AtRuleBlockList.php
index a424adbe..21b855e2 100644
--- a/src/CSSList/AtRuleBlockList.php
+++ b/src/CSSList/AtRuleBlockList.php
@@ -42,6 +42,8 @@ public function atRuleName()
 
     /**
      * @return string
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getter instead.
      */
     public function atRuleArgs()
     {
diff --git a/src/CSSList/KeyFrame.php b/src/CSSList/KeyFrame.php
index 618308a7..fd271fb1 100644
--- a/src/CSSList/KeyFrame.php
+++ b/src/CSSList/KeyFrame.php
@@ -101,6 +101,8 @@ public function atRuleName()
 
     /**
      * @return string|null
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getter instead.
      */
     public function atRuleArgs()
     {
diff --git a/src/Property/AtRule.php b/src/Property/AtRule.php
index d946a904..0eaf40bd 100644
--- a/src/Property/AtRule.php
+++ b/src/Property/AtRule.php
@@ -33,6 +33,8 @@ public function atRuleName();
 
     /**
      * @return string|null
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getter(s) in the implementing class instead.
      */
     public function atRuleArgs();
 }
diff --git a/src/Property/CSSNamespace.php b/src/Property/CSSNamespace.php
index 0d90cc3b..a11035f5 100644
--- a/src/Property/CSSNamespace.php
+++ b/src/Property/CSSNamespace.php
@@ -120,6 +120,8 @@ public function atRuleName()
 
     /**
      * @return array<int, string>
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getters instead.
      */
     public function atRuleArgs()
     {
diff --git a/src/Property/Charset.php b/src/Property/Charset.php
index de9016ad..8b955d00 100644
--- a/src/Property/Charset.php
+++ b/src/Property/Charset.php
@@ -103,6 +103,8 @@ public function atRuleName()
 
     /**
      * @return string
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getter instead.
      */
     public function atRuleArgs()
     {
diff --git a/src/Property/Import.php b/src/Property/Import.php
index e3f10474..75c2e5ee 100644
--- a/src/Property/Import.php
+++ b/src/Property/Import.php
@@ -105,6 +105,8 @@ public function atRuleName()
 
     /**
      * @return array<int, URL|string>
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getters instead.
      */
     public function atRuleArgs()
     {
diff --git a/src/RuleSet/AtRuleSet.php b/src/RuleSet/AtRuleSet.php
index e687cb96..4665f7e9 100644
--- a/src/RuleSet/AtRuleSet.php
+++ b/src/RuleSet/AtRuleSet.php
@@ -45,6 +45,8 @@ public function atRuleName()
 
     /**
      * @return string
+     *
+     * @deprecated since V8.8.0, will be removed in version 9.0.0. Use the specific getter instead.
      */
     public function atRuleArgs()
     {