diff --git a/src/Engine/DatabaseEngine.php b/src/Engine/DatabaseEngine.php
index b3ce27a..0c9e49f 100644
--- a/src/Engine/DatabaseEngine.php
+++ b/src/Engine/DatabaseEngine.php
@@ -48,7 +48,7 @@ abstract protected function executeQuery(string $query, array $parameters) : arr
      *
      * @throws GeometryEngineException
      */
-    private function query(string $function, array $parameters, bool $returnsGeometry) : array
+    protected function query(string $function, array $parameters, bool $returnsGeometry) : array
     {
         $queryParameters = [];
 
@@ -92,7 +92,7 @@ private function query(string $function, array $parameters, bool $returnsGeometr
      *
      * @throws GeometryEngineException
      */
-    private function queryBoolean(string $function, ...$parameters) : bool
+    protected function queryBoolean(string $function, ...$parameters) : bool
     {
         [$result] = $this->query($function, $parameters, false);
 
@@ -117,7 +117,7 @@ private function queryBoolean(string $function, ...$parameters) : bool
      *
      * @throws GeometryEngineException
      */
-    private function queryFloat(string $function, ...$parameters) : float
+    protected function queryFloat(string $function, ...$parameters) : float
     {
         [$result] = $this->query($function, $parameters, false);
 
@@ -140,7 +140,7 @@ private function queryFloat(string $function, ...$parameters) : float
      *
      * @throws GeometryEngineException
      */
-    private function queryGeometry(string $function, ...$parameters) : Geometry
+    protected function queryGeometry(string $function, ...$parameters) : Geometry
     {
         /** @var array{string|null, string|resource|null, string, int|numeric-string} $result */
         $result = $this->query($function, $parameters, true);
@@ -181,7 +181,7 @@ private function queryGeometry(string $function, ...$parameters) : Geometry
      *
      * @throws GeometryEngineException
      */
-    private function getProxyClassName(string $geometryType) : string
+    protected function getProxyClassName(string $geometryType) : string
     {
         $proxyClasses = [
             'CIRCULARSTRING'     => Proxy\CircularStringProxy::class,
diff --git a/src/Engine/GEOSEngine.php b/src/Engine/GEOSEngine.php
index 3691c79..d80990a 100644
--- a/src/Engine/GEOSEngine.php
+++ b/src/Engine/GEOSEngine.php
@@ -79,7 +79,7 @@ public function __construct()
      *
      * @return \GEOSGeometry
      */
-    private function toGEOS(Geometry $geometry) : \GEOSGeometry
+    protected function toGEOS(Geometry $geometry) : \GEOSGeometry
     {
         if ($geometry->isEmpty()) {
             $geosGeometry = $this->wktReader->read($geometry->asText());
@@ -100,7 +100,7 @@ private function toGEOS(Geometry $geometry) : \GEOSGeometry
      *
      * @return Geometry
      */
-    private function fromGEOS(\GEOSGeometry $geometry) : Geometry
+    protected function fromGEOS(\GEOSGeometry $geometry) : Geometry
     {
         if ($geometry->isEmpty()) {
             return Geometry::fromText($this->wktWriter->write($geometry), $geometry->getSRID());