diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index ed00b974..89f6d7a8 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -10,7 +10,7 @@ For questions and discussion, use the author's [Telegram chat](https://t.me/pred
 
 ## Development setup
 
-Requirements: 64-bit PHP 8.2–8.5 and [Composer](https://getcomposer.org/download/).
+Requirements: 64-bit PHP 8.2–8.6 and [Composer](https://getcomposer.org/download/).
 
 Fork the repository, clone it and run `composer install`.
 
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a3b1a353..d71352eb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,6 +28,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/composer-dependency-analyser.yml b/.github/workflows/composer-dependency-analyser.yml
index 22bf2b38..f41a82cf 100644
--- a/.github/workflows/composer-dependency-analyser.yml
+++ b/.github/workflows/composer-dependency-analyser.yml
@@ -27,6 +27,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
 
     steps:
       - name: Checkout.
diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
index 877af238..25351e43 100644
--- a/.github/workflows/mutation.yml
+++ b/.github/workflows/mutation.yml
@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        php: ["8.5"]
+        php: ["8.6"]
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 446dc388..30af6ebc 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -28,6 +28,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
 
     steps:
       - name: Checkout
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6ac7aa6..2e8289b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,13 +4,14 @@
 
 - Enh #223: Convert the PHP warning raised on failure to read a local file in `NativeTransport` into an exception with
   the original error message.
+- Enh #229: Replace Psalm with PHPStan for static analysis.
+- Enh #230: Add PHP 8.6 support.
 - Bug #227: Throw `InvalidArgumentException` on serialization of rich text that contains an element other than
   a string, a `RichText` object or an array of them, instead of failing with `TypeError` or silently casting scalars
   to strings.
 - Bug #227: Discard keys of rich text arrays on serialization, so they are always sent as JSON arrays, not objects.
 - Bug #228: Fix "Undefined array key" error in `InputFile::filename()` and `CurlTransport` when a stream resource has
   no URI.
-- Enh #229: Replace Psalm with PHPStan for static analysis.
 
 ## 0.22 August 25, 2026
 
diff --git a/README.md b/README.md
index 3482a3fd..e19b89fa 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ The package provides a simple and convenient way to interact with the Telegram B
 
 ## Requirements
 
-- PHP (64-bit) 8.2 - 8.5.
+- PHP (64-bit) 8.2 - 8.6.
 
 ## Installation
 
diff --git a/composer.json b/composer.json
index 6d2557e8..2c3affce 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         }
     ],
     "require": {
-        "php-64bit": "8.2 - 8.5"
+        "php-64bit": "8.2 - 8.6"
     },
     "require-dev": {
         "ext-curl": "*",
diff --git a/tests/Transport/NativeTransport/NativeTransportTest.php b/tests/Transport/NativeTransport/NativeTransportTest.php
index 56803890..cf92f826 100644
--- a/tests/Transport/NativeTransport/NativeTransportTest.php
+++ b/tests/Transport/NativeTransport/NativeTransportTest.php
@@ -18,6 +18,7 @@
 use function PHPUnit\Framework\assertSame;
 use function PHPUnit\Framework\assertStringContainsString;
 use function PHPUnit\Framework\assertTrue;
+use function sprintf;
 
 final class NativeTransportTest extends TestCase
 {
@@ -239,7 +240,11 @@ public function testReadNonExistentFileThrowsException(): void
 
         $this->expectException(RuntimeException::class);
         $this->expectExceptionMessage(
-            "Failed to read the file $nonExistentPath. file_get_contents($nonExistentPath): Failed to open stream: No such file or directory",
+            sprintf(
+                'Failed to read the file %s. %s: Failed to open stream: No such file or directory',
+                $nonExistentPath,
+                PHP_VERSION_ID >= 80600 ? 'file_get_contents()' : "file_get_contents($nonExistentPath)",
+            ),
         );
         $transport->postWithFiles(
             'http://url/method',