diff --git a/src/Collect/Support/Collection.php b/src/Collect/Support/Collection.php
index 44b5f7e..d50ebc2 100644
--- a/src/Collect/Support/Collection.php
+++ b/src/Collect/Support/Collection.php
@@ -1646,7 +1646,7 @@ public function count(): int
     /**
      * Count the number of items in the collection by a field or using a callback.
      *
-     * @param  (callable(TValue, TKey): mixed)|string|null  $countBy
+     * @param  (callable(TValue, TKey): array-key)|string|null  $countBy
      * @return static<array-key, int>
      */
     public function countBy($countBy = null)
diff --git a/src/Collect/Support/Enumerable.php b/src/Collect/Support/Enumerable.php
index 7f35e48..d8b21da 100644
--- a/src/Collect/Support/Enumerable.php
+++ b/src/Collect/Support/Enumerable.php
@@ -1168,7 +1168,7 @@ public function count(): int;
     /**
      * Count the number of items in the collection by a field or using a callback.
      *
-     * @param  (callable(TValue, TKey): mixed)|string|null  $countBy
+     * @param  (callable(TValue, TKey): array-key)|string|null  $countBy
      * @return static<array-key, int>
      */
     public function countBy($countBy = null);
diff --git a/src/Collect/Support/LazyCollection.php b/src/Collect/Support/LazyCollection.php
index e6b8d8b..eb94e0d 100644
--- a/src/Collect/Support/LazyCollection.php
+++ b/src/Collect/Support/LazyCollection.php
@@ -292,7 +292,7 @@ public function crossJoin(...$arrays)
     /**
      * Count the number of items in the collection by a field or using a callback.
      *
-     * @param  (callable(TValue, TKey): mixed)|string|null  $countBy
+     * @param  (callable(TValue, TKey): array-key)|string|null  $countBy
      * @return static<array-key, int>
      */
     public function countBy($countBy = null)
diff --git a/upgrade.sh b/upgrade.sh
index 05694d4..8a8c586 100755
--- a/upgrade.sh
+++ b/upgrade.sh
@@ -381,7 +381,7 @@ function getCurrentVersionFromGitHub()
     echo Getting current version from $repository...
 
     if [ -z "$requestedVersion" ]; then
-        collectionVersion=$(git ls-remote $repository --tags  v9.47\* | grep tags/ | grep -v {} | cut -d \/ -f 3 | cut -d v -f 2  | grep -v RC | grep -vi beta | sort -t. -k 1,1n -k 2,2n -k 3,3n| tail -1)
+        collectionVersion=$(git ls-remote $repository --tags  v9.48\* | grep tags/ | grep -v {} | cut -d \/ -f 3 | cut -d v -f 2  | grep -v RC | grep -vi beta | sort -t. -k 1,1n -k 2,2n -k 3,3n| tail -1)
     else
         collectionVersion=$requestedVersion
     fi