diff --git a/src/Optimizely/Decide/OptimizelyDecision.php b/src/Optimizely/Decide/OptimizelyDecision.php
index 3cd7fe1c..a69cc8a5 100644
--- a/src/Optimizely/Decide/OptimizelyDecision.php
+++ b/src/Optimizely/Decide/OptimizelyDecision.php
@@ -81,6 +81,7 @@ public function getReasons()
         return $this->reasons;
     }
 
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyAttribute.php b/src/Optimizely/OptimizelyConfig/OptimizelyAttribute.php
index d3eee9b9..a38182d5 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyAttribute.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyAttribute.php
@@ -53,6 +53,7 @@ public function getKey()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyAudience.php b/src/Optimizely/OptimizelyConfig/OptimizelyAudience.php
index e331871a..d11e4b32 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyAudience.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyAudience.php
@@ -68,6 +68,7 @@ public function getConditions()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php b/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php
index 26093779..c8d6f33e 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyConfig.php
@@ -166,6 +166,7 @@ public function getEvents()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyEvent.php b/src/Optimizely/OptimizelyConfig/OptimizelyEvent.php
index 8a3a90de..17ff39ed 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyEvent.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyEvent.php
@@ -68,6 +68,7 @@ public function getExperimentIds()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyExperiment.php b/src/Optimizely/OptimizelyConfig/OptimizelyExperiment.php
index 71bd9959..77d274b3 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyExperiment.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyExperiment.php
@@ -83,6 +83,7 @@ public function getVariationsMap()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyFeature.php b/src/Optimizely/OptimizelyConfig/OptimizelyFeature.php
index 7b605064..491f4ea2 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyFeature.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyFeature.php
@@ -118,6 +118,7 @@ public function getVariablesMap()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyVariable.php b/src/Optimizely/OptimizelyConfig/OptimizelyVariable.php
index 836e054f..fade386b 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyVariable.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyVariable.php
@@ -82,6 +82,7 @@ public function getValue()
     /**
      * @return string JSON representation of the object.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
diff --git a/src/Optimizely/OptimizelyConfig/OptimizelyVariation.php b/src/Optimizely/OptimizelyConfig/OptimizelyVariation.php
index e7335eea..3e735a20 100644
--- a/src/Optimizely/OptimizelyConfig/OptimizelyVariation.php
+++ b/src/Optimizely/OptimizelyConfig/OptimizelyVariation.php
@@ -84,6 +84,7 @@ public function getVariablesMap()
      * @return string JSON representation of the object.
      *                Unsets featureEnabled property for variations of ab experiments.
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         $props = get_object_vars($this);

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