diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 33c065c..b871f2c 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -74,10 +74,8 @@ jobs:
       fail-fast: false
       matrix:
         php:
-          - '8.0'  # from 2020-11 to 2022-11 (2023-11)
-          - '8.1'  # from 2021-11 to 2023-11 (2025-12)
-          - '8.2'  # from 2022-12 to 2024-12 (2026-12)
           - '8.3'  # from 2023-11 to 2025-12 (2027-12)
+          - '8.4'
     steps:
       - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
@@ -118,10 +116,8 @@ jobs:
       fail-fast: false
       matrix:
         php:
-          - '8.0'  # from 2020-11 to 2022-11 (2023-11)
-          - '8.1'  # from 2021-11 to 2023-11 (2025-12)
-          - '8.2'  # from 2022-12 to 2024-12 (2026-12)
           - '8.3'  # from 2023-11 to 2025-12 (2027-12)
+          - '8.4'
     steps:
       - uses: actions/checkout@v4
       - uses: docker://pipelinecomponents/php-codesniffer
diff --git a/composer.json b/composer.json
index c2d7e80..0301788 100644
--- a/composer.json
+++ b/composer.json
@@ -18,12 +18,12 @@
   "license": "MIT",
   "name": "pdsinterop/solid-crud",
   "require": {
-    "php": "^8.0",
+    "php": "^8.3",
     "ext-mbstring": "*",
-    "laminas/laminas-diactoros": "^2.14",
+    "laminas/laminas-diactoros": "^3",
     "league/flysystem": "^1.0",
     "mjrider/flysystem-factory": "^0.7",
-    "pdsinterop/flysystem-rdf": "^0.6.1",
+    "pdsinterop/flysystem-rdf": "dev-feature/flysystem-3",
     "pietercolpaert/hardf": "^0.3",
     "psr/http-factory": "^1.0",
     "psr/http-message": "^1.0"
diff --git a/src/Server.php b/src/Server.php
index bab4982..28f8c87 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -208,9 +208,9 @@ private function handle(string $method, string $path, $contents, $request): Resp
                 }
             break;
             case 'POST':
-                $pathExists = $filesystem->has($path);
+                $pathExists = $filesystem->fileExists($path);
                 if ($pathExists) {
-                    $mimetype = $filesystem->getMimetype($path);
+                    $mimetype = $filesystem->mimeType($path);
                 }
                 if ($path === "/") {
                     $pathExists = true;
@@ -268,7 +268,7 @@ private function handle(string $method, string $path, $contents, $request): Resp
                         $response = $this->handleCreateDirectoryRequest($response, $path);
                     break;
                     default:
-                        if ($filesystem->has($path) === true) {
+                        if ($filesystem->fileExists($path) === true) {
                             $response = $this->handleUpdateRequest($response, $path, $contents);
                         } else {
                             $response = $this->handleCreateRequest($response, $path, $contents);
@@ -289,7 +289,7 @@ private function handleSparqlUpdate(Response $response, string $path, $contents)
         $filesystem = $this->filesystem;
         $graph = $this->getGraph();
 
-        if ($filesystem->has($path) === false) {
+        if ($filesystem->fileExists($path) === false) {
             $data = '';
         } else {
             // read ttl data
@@ -349,11 +349,7 @@ private function handleSparqlUpdate(Response $response, string $path, $contents)
             $output = $graph->serialise("turtle"); // FIXME: Use enums from namespace Pdsinterop\Rdf\Enum\Format?
             // write ttl data
 
-            if ($filesystem->has($path) === true) {
-                $success = $filesystem->update($path, $output);
-            } else {
-                $success = $filesystem->write($path, $output);
-            }
+            $success = $filesystem->write($path, $output);
 
             $response = $response->withStatus($success ? 201 : 500);
 
@@ -446,7 +442,7 @@ private function handleN3Update(Response $response, string $path, $contents): Re
         $graph = $this->getGraph();
         $n3Graph = $this->getGraph();
 
-        if ($filesystem->has($path) === false) {
+        if ($filesystem->fileExists($path) === false) {
             $data = '';
         } else {
             // read ttl data
@@ -497,11 +493,7 @@ private function handleN3Update(Response $response, string $path, $contents): Re
             $output = $graph->serialise("turtle"); // FIXME: Use enums from namespace Pdsinterop\Rdf\Enum\Format?
             // write ttl data
 
-            if ($filesystem->has($path) === true) {
-                $success = $filesystem->update($path, $output);
-            } else {
-                $success = $filesystem->write($path, $output);
-            }
+            $success = $filesystem->write($path, $output);
 
             $response = $response->withStatus($success ? 201 : 500);
 
@@ -525,7 +517,7 @@ private function handleCreateRequest(Response $response, string $path, $contents
     {
         $filesystem = $this->filesystem;
 
-        if ($filesystem->has($path) === true) {
+        if ($filesystem->fileExists($path) === true) {
             $message = vsprintf(self::ERROR_PUT_EXISTING_RESOURCE, [$path]);
             $response->getBody()->write($message);
             $response = $response->withStatus(400);
@@ -582,12 +574,12 @@ private function parentPath($path)
     private function handleCreateDirectoryRequest(Response $response, string $path): Response
     {
         $filesystem = $this->filesystem;
-        if ($filesystem->has($path) === true) {
+        if ($filesystem->fileExists($path) === true) {
             $message = vsprintf(self::ERROR_PUT_EXISTING_RESOURCE, [$path]);
             $response->getBody()->write($message);
             $response = $response->withStatus(400);
         } else {
-            $success = $filesystem->createDir($path);
+            $success = $filesystem->createDirectory($path);
             $response = $response->withStatus($success ? 201 : 500);
             if ($success) {
                 $this->removeLinkFromMetaFileFor($path);
@@ -617,8 +609,8 @@ private function handleDeleteRequest(Response $response, string $path, $contents
     {
         $filesystem = $this->filesystem;
 
-        if ($filesystem->has($path)) {
-            $mimetype = $filesystem->getMimetype($path);
+        if ($filesystem->fileExists($path)) {
+            $mimetype = $filesystem->mimeType($path);
 
             if ($mimetype === self::MIME_TYPE_DIRECTORY) {
                 $directoryContents = $filesystem->listContents($path, true);
@@ -627,7 +619,7 @@ private function handleDeleteRequest(Response $response, string $path, $contents
                     $message = vsprintf(self::ERROR_CAN_NOT_DELETE_NON_EMPTY_CONTAINER, [$path]);
                     $response->getBody()->write($message);
                 } else {
-                    $success = $filesystem->deleteDir($path);
+                    $success = $filesystem->deleteDirectory($path);
                     if ($success) {
                         $this->sendNotificationUpdate($path, self::NOTIFICATION_TYPE_DELETE);
                     }
@@ -656,12 +648,12 @@ private function handleUpdateRequest(Response $response, string $path, string $c
     {
         $filesystem = $this->filesystem;
 
-        if ($filesystem->has($path) === false) {
+        if ($filesystem->fileExists($path) === false) {
             $message = vsprintf(self::ERROR_PUT_NON_EXISTING_RESOURCE, [$path]);
             $response->getBody()->write($message);
             $response = $response->withStatus(400);
         } else {
-            $success = $filesystem->update($path, $contents);
+            $success = $filesystem->write($path, $contents);
             $response = $response->withStatus($success ? 201 : 500);
             if ($success) {
                 $this->removeLinkFromMetaFileFor($path);
@@ -707,12 +699,12 @@ private function handleReadRequest(Response $response, string $path, $contents,
                 '<http://www.w3.org/ns/pim/space#Storage>; rel="type"',
             ]);
             $response = $response->withStatus(200);
-        } elseif(($filesystem->has($path) === false) && (($path == ".meta") || ($path == "/.meta"))) {
+        } elseif(($filesystem->fileExists($path) === false) && (($path == ".meta") || ($path == "/.meta"))) {
             $contents = '';
             $response->getBody()->write($contents);
             $response = $response->withHeader("Content-type", "text/turtle");
             $response = $response->withStatus(200);
-        } elseif ($filesystem->has($path) === false && $this->hasDescribedBy($path) === false) {
+        } elseif ($filesystem->fileExists($path) === false && $this->hasDescribedBy($path) === false) {
             /*/ The file does not exist and no link-metadata is present /*/
             $message = vsprintf(self::ERROR_PATH_DOES_NOT_EXIST, [$path]);
             $response->getBody()->write($message);
@@ -722,21 +714,21 @@ private function handleReadRequest(Response $response, string $path, $contents,
             if ($linkMetadataResponse !== null) {
                 /*/ Link-metadata is present, return the altered response /*/
                 $response = $linkMetadataResponse;
-            } elseif ($filesystem->getMimetype($path) === self::MIME_TYPE_DIRECTORY) {
+            } elseif ($filesystem->mimeType($path) === self::MIME_TYPE_DIRECTORY) {
                 $contents = $this->listDirectoryAsTurtle($path);
                 $response->getBody()->write($contents);
                 $response = $response->withHeader("Content-type", "text/turtle")->withStatus(200);
-            } elseif ($filesystem->asMime($mime)->has($path)) {
+            } elseif ($filesystem->asMime($mime)->fileExists($path)) {
             /*/ The file does exist and no link-metadata is present /*/
                 $response = $this->addLinkRelationHeaders($response, $path, $mime);
 
                 if (preg_match('/\.(acl|meta|ttl)$/', $path)) {
                     $mimetype = "text/turtle"; // FIXME: teach  flysystem that .acl/.meta/.ttl means text/turtle
                 } else {
-                    $mimetype = $filesystem->asMime($mime)->getMimetype($path);
+                    $mimetype = $filesystem->asMime($mime)->mimeType($path);
                 }
 
-                $fileMimeType = $filesystem->asMime('')->getMimetype($path);
+                $fileMimeType = $filesystem->asMime('')->mimeType($path);
                 if (in_array($fileMimeType, $acceptedMimeTypes)) {
                     $contents = $filesystem->asMime('')->read($path);
                     $mimetype = $fileMimeType;
@@ -748,7 +740,7 @@ private function handleReadRequest(Response $response, string $path, $contents,
                     $response->getBody()->write($contents);
                     $response = $response->withHeader("Content-type", $mimetype)->withStatus(200);
                 } else {
-                    // FIXME: we should not get here if the file does not exist, but here we are. It looks like $filesystem->has("/.meta") always returns true even if the file does not exist;
+                    // FIXME: we should not get here if the file does not exist, but here we are. It looks like $filesystem->fileExists("/.meta") always returns true even if the file does not exist;
                     if ($path == "/.meta") {
             $contents = '';
             $response->getBody()->write($contents);
@@ -1090,7 +1082,7 @@ private function findPath(array $rdfPaths, string $path)
         foreach ($rdfPaths as $rdfPath) {
             if (
                 strrpos($path, $rdfPath) === 0
-                && $this->filesystem->has($rdfPath)
+                && $this->filesystem->fileExists($rdfPath)
             ) {
                 // @FIXME: We have no way of knowing if the file is a directory or a file.
                 //         This means that, unless we make a trialing slash `/` required,
@@ -1151,7 +1143,7 @@ private function removeLinkFromMetaFileFor($path): bool
             if ($changed) {
                 $changedContents = $graph->serialise('turtle');
                 try {
-                    $result = $this->filesystem->update($describedByPath, $changedContents);
+                    $result = $this->filesystem->write($describedByPath, $changedContents);
                 } catch (FileNotFoundException $exception) {
                     // $result is already false;
                 }