diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index ec02a67..a59fb53 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -69,3 +69,25 @@ updates:
       applies-to: version-updates
       patterns:
         - "symfony/*"
+
+- package-ecosystem: composer
+  directory: "/"
+  target-branch: stable34
+  schedule:
+    interval: "weekly"
+  open-pull-requests-limit: 20
+  commit-message:
+    prefix: "build"
+    include: "scope"
+  versioning-strategy: "increase"
+  ignore:
+    - dependency-name: "*"
+      update-types: ["version-update:semver-major", "version-update:semver-minor"]
+  labels:
+    - "dependencies"
+    - "stable34"
+  groups:
+    symfony:
+      applies-to: version-updates
+      patterns:
+        - "symfony/*"
diff --git a/composer.json b/composer.json
index f6dc7f2..bc585eb 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
 		"jsignpdf/jsignpdf-php": "^1.3.1",
 		"libresign/pdf-signature-validator": "^0.2.0",
 		"libresign/whatosami": "^0.0.2",
-		"mikehaertl/php-pdftk": "^0.14.2",
+		"mikehaertl/php-pdftk": "^0.14.3",
 		"mpdf/mpdf": "^8.2.6",
 		"pagerfanta/pagerfanta": "^4.7.1",
 		"phpseclib/phpseclib": "^3.0",
diff --git a/composer.lock b/composer.lock
index 43adcf4..d60721d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b0d12a9046a0003e272feb328986722e",
+    "content-hash": "c3be9af088319358d6c8fbd8784b6d6e",
     "packages": [
         {
             "name": "bacon/bacon-qr-code",
@@ -405,16 +405,16 @@
         },
         {
             "name": "mikehaertl/php-pdftk",
-            "version": "0.14.2",
+            "version": "0.14.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/mikehaertl/php-pdftk.git",
-                "reference": "f1f9ac6d6c9ee655504ddfcc0d1be3ff9cbfb3eb"
+                "reference": "25dba2edcba9b8eedec7dc65a79557c2018eafef"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/mikehaertl/php-pdftk/zipball/f1f9ac6d6c9ee655504ddfcc0d1be3ff9cbfb3eb",
-                "reference": "f1f9ac6d6c9ee655504ddfcc0d1be3ff9cbfb3eb",
+                "url": "https://api.github.com/repos/mikehaertl/php-pdftk/zipball/25dba2edcba9b8eedec7dc65a79557c2018eafef",
+                "reference": "25dba2edcba9b8eedec7dc65a79557c2018eafef",
                 "shasum": ""
             },
             "require": {
@@ -454,9 +454,9 @@
             ],
             "support": {
                 "issues": "https://github.com/mikehaertl/php-pdftk/issues",
-                "source": "https://github.com/mikehaertl/php-pdftk/tree/0.14.2"
+                "source": "https://github.com/mikehaertl/php-pdftk/tree/0.14.3"
             },
-            "time": "2025-10-01T10:06:01+00:00"
+            "time": "2026-06-24T10:20:40+00:00"
         },
         {
             "name": "mikehaertl/php-shellcommand",
diff --git a/composer/composer/installed.json b/composer/composer/installed.json
index 5e9e954..7fb400d 100644
--- a/composer/composer/installed.json
+++ b/composer/composer/installed.json
@@ -420,17 +420,17 @@
         },
         {
             "name": "mikehaertl\/php-pdftk",
-            "version": "0.14.2",
-            "version_normalized": "0.14.2.0",
+            "version": "0.14.3",
+            "version_normalized": "0.14.3.0",
             "source": {
                 "type": "git",
                 "url": "https:\/\/github.com\/mikehaertl\/php-pdftk.git",
-                "reference": "f1f9ac6d6c9ee655504ddfcc0d1be3ff9cbfb3eb"
+                "reference": "25dba2edcba9b8eedec7dc65a79557c2018eafef"
             },
             "dist": {
                 "type": "zip",
-                "url": "https:\/\/api.github.com\/repos\/mikehaertl\/php-pdftk\/zipball\/f1f9ac6d6c9ee655504ddfcc0d1be3ff9cbfb3eb",
-                "reference": "f1f9ac6d6c9ee655504ddfcc0d1be3ff9cbfb3eb",
+                "url": "https:\/\/api.github.com\/repos\/mikehaertl\/php-pdftk\/zipball\/25dba2edcba9b8eedec7dc65a79557c2018eafef",
+                "reference": "25dba2edcba9b8eedec7dc65a79557c2018eafef",
                 "shasum": ""
             },
             "require": {
@@ -441,7 +441,7 @@
             "require-dev": {
                 "bamarni\/composer-bin-plugin": "^1.8"
             },
-            "time": "2025-10-01T10:06:01+00:00",
+            "time": "2026-06-24T10:20:40+00:00",
             "type": "library",
             "extra": {
                 "bamarni-bin": {
@@ -472,7 +472,7 @@
             ],
             "support": {
                 "issues": "https:\/\/github.com\/mikehaertl\/php-pdftk\/issues",
-                "source": "https:\/\/github.com\/mikehaertl\/php-pdftk\/tree\/0.14.2"
+                "source": "https:\/\/github.com\/mikehaertl\/php-pdftk\/tree\/0.14.3"
             },
             "install-path": "..\/mikehaertl\/php-pdftk"
         },
@@ -2939,6 +2939,6 @@
             "install-path": "..\/wobeto\/email-blur"
         }
     ],
-    "dev": true,
+    "dev": false,
     "dev-package-names": []
 }
\ No newline at end of file
diff --git a/composer/mikehaertl/php-pdftk/src/Pdf.php b/composer/mikehaertl/php-pdftk/src/Pdf.php
index 4955917..d37cdfc 100644
--- a/composer/mikehaertl/php-pdftk/src/Pdf.php
+++ b/composer/mikehaertl/php-pdftk/src/Pdf.php
@@ -663,7 +663,11 @@ protected function nextHandle() : string
         $i = $this->_handle++;
         $char = 'A';
         while ($i-- > 0) {
-            $char++;
+            if (\function_exists('OCA\\Libresign\\Vendor\\str_increment')) {
+                $char = str_increment($char);
+            } else {
+                $char++;
+            }
         }
         return $char;
     }