diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3b89dea..d058d8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 3.9.6
+- Fixed issue with fallback attribute ignoring when needed.
+
 # 3.9.5
 - Add subscription logic
 - Fix issue with null handling
diff --git a/lib/src/Utils/gb_utils.dart b/lib/src/Utils/gb_utils.dart
index 6bec298..0ef742a 100644
--- a/lib/src/Utils/gb_utils.dart
+++ b/lib/src/Utils/gb_utils.dart
@@ -374,8 +374,8 @@ class GBUtils {
     // Retrieve fallbackAttributeAndValue and fallbackKey
     final fallbackAttributeAndValue = getHashAttribute(
       context: context,
-      attr: null,
-      fallback: expFallBackAttribute,
+      attr: expFallBackAttribute,
+      fallback: null,
       attributeOverrides: attributeOverrides,
     );
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 59677f6..0470c6d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: growthbook_sdk_flutter
 description: An open-source feature flagging and experimentation platform that makes it simple to alter features and execute A/B testing.
-version: 3.9.5
+version: 3.9.6
 homepage: https://github.com/alippo-com/GrowthBook-SDK-Flutter
 repository: https://github.com/growthbook/growthbook-flutter
 
diff --git a/test/test_cases/test_case.dart b/test/test_cases/test_case.dart
index c52b53f..76b0008 100644
--- a/test/test_cases/test_case.dart
+++ b/test/test_cases/test_case.dart
@@ -7715,6 +7715,72 @@ const String gbTestCases = r'''
         }
       }
     ],
+    [
+        "upgrades a sticky bucket doc from a fallbackAttribute to a hashAttribute",
+        {
+          "attributes": {
+            "id": "i123",
+            "anonymousId": "ses123",
+            "foo": "bar",
+            "country": "USA"
+          },
+          "features": {
+            "exp1": {
+              "defaultValue": "control",
+              "rules": [
+                {
+                  "key": "feature-exp",
+                  "seed": "feature-exp",
+                  "hashAttribute": "id",
+                  "fallbackAttribute": "anonymousId",
+                  "hashVersion": 2,
+                  "bucketVersion": 0,
+                  "condition": { "country": "USA" },
+                  "variations": ["control", "red", "blue"],
+                  "meta": [{ "key": "0" }, { "key": "1" }, { "key": "2" }],
+                  "coverage": 1,
+                  "weights": [0.3334, 0.3333, 0.3333],
+                  "phase": "0"
+                }
+              ]
+            }
+          }
+        },
+        [
+          {
+            "attributeName": "anonymousId",
+            "attributeValue": "ses123",
+            "assignments": {
+              "feature-exp__0": "1"
+            }
+          }
+        ],
+        "exp1",
+        {
+          "bucket": 0.9943,
+          "featureId": "exp1",
+          "hashAttribute": "id",
+          "hashUsed": true,
+          "hashValue": "i123",
+          "inExperiment": true,
+          "key": "1",
+          "stickyBucketUsed": true,
+          "value": "red",
+          "variationId": 1
+        },
+        {
+          "anonymousId||ses123": {
+          "assignments": { "feature-exp__0": "1" },
+          "attributeName": "anonymousId",
+           "attributeValue": "ses123"
+        },
+          "id||i123": {
+          "assignments": { "feature-exp__0": "1" },
+          "attributeName": "id",
+          "attributeValue": "i123"
+        }
+      }
+    ],
     [
       "favors a sticky bucket doc based on hashAttribute over fallbackAttribute",
       {