diff --git a/src/Query/BuilderConverter/GreaterThan.php b/src/Query/BuilderConverter/GreaterThan.php
index 5527cb8..ff75fe3 100644
--- a/src/Query/BuilderConverter/GreaterThan.php
+++ b/src/Query/BuilderConverter/GreaterThan.php
@@ -23,7 +23,7 @@ readonly class GreaterThan implements IBuilderConverter
         return $builder->orWhere($this->argument->field, ">", $this->formatValue());
     }
 
-    private function formatValue(): int|float
+    private function formatValue(): int|float|string
     {
         $value = trim($this->argument->value);
         if (is_numeric($value)) {
diff --git a/src/Query/BuilderConverter/GreaterThanEquals.php b/src/Query/BuilderConverter/GreaterThanEquals.php
index 809cf7f..866d01e 100644
--- a/src/Query/BuilderConverter/GreaterThanEquals.php
+++ b/src/Query/BuilderConverter/GreaterThanEquals.php
@@ -23,7 +23,7 @@ readonly class GreaterThanEquals implements IBuilderConverter
         return $builder->orWhere($this->argument->field, ">=", $this->formatValue());
     }
 
-    private function formatValue(): int|float
+    private function formatValue(): int|float|string
     {
         $value = trim($this->argument->value);
         if (is_numeric($value)) {
diff --git a/src/Query/BuilderConverter/LessThan.php b/src/Query/BuilderConverter/LessThan.php
index aefea3e..41e6a94 100644
--- a/src/Query/BuilderConverter/LessThan.php
+++ b/src/Query/BuilderConverter/LessThan.php
@@ -23,7 +23,7 @@ readonly class LessThan implements IBuilderConverter
         return $builder->orWhere($this->argument->field, "<", $this->formatValue());
     }
 
-    private function formatValue(): int|float
+    private function formatValue(): int|float|string
     {
         $value = trim($this->argument->value);
         if (is_numeric($value)) {
diff --git a/src/Query/BuilderConverter/LessThanEquals.php b/src/Query/BuilderConverter/LessThanEquals.php
index 000c63d..8009f95 100644
--- a/src/Query/BuilderConverter/LessThanEquals.php
+++ b/src/Query/BuilderConverter/LessThanEquals.php
@@ -23,7 +23,7 @@ readonly class LessThanEquals implements IBuilderConverter
         return $builder->orWhere($this->argument->field, "<=", $this->formatValue());
     }
 
-    private function formatValue(): int|float
+    private function formatValue(): int|float|string
     {
         $value = trim($this->argument->value);
         if (is_numeric($value)) {