diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 5bffd06..56d1728 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -13,9 +13,10 @@ jobs:
   Linux:
     runs-on: ubuntu-latest
     strategy:
+      max-parallel: 10
       matrix:
         platform: ['linux/amd64', 'linux/arm64/v8', 'linux/s390x']
-        version: ['8.1', '8.2', '8.3']
+        version: ['8.1', '8.2', '8.3', '8.4']
         type: ['cli', 'zts']
         distro: ['bookworm', 'alpine']
     steps:
diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
index f36ca77..fa1e788 100644
--- a/.github/workflows/coverage.yaml
+++ b/.github/workflows/coverage.yaml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: ['8.3']
+        version: ['8.4']
         type: ['cli', 'zts']
         distro: ['bookworm']
     outputs:
diff --git a/Dockerfile b/Dockerfile
index 7d64d3b..40aa924 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 ARG PLATFORM=${BUILDPLATFORM:-linux/amd64}
 ARG IMAGE=php
-ARG TAG=8.3-cli-bookworm
+ARG TAG=8.4-cli-bookworm
 
 FROM --platform=${PLATFORM} ${IMAGE}:${TAG}
 
diff --git a/composer.json b/composer.json
index 8fb741b..8530eea 100644
--- a/composer.json
+++ b/composer.json
@@ -3,15 +3,13 @@
     "description": "Current time modification extension wrapper library.",
     "type": "library",
     "require": {
-        "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
+        "php": "~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.1",
         "ext-colopl_timeshifter": "^1.0"
     },
     "require-dev": {
         "phpstan/phpstan": "^1",
-        "vimeo/psalm": "^5",
         "phpunit/phpunit": "^10",
-        "phpstan/phpstan-phpunit": "^1",
-        "psalm/plugin-phpunit": "^0.19"
+        "phpstan/phpstan-phpunit": "^1"
     },
     "license": "PHP-3.01",
     "autoload": {
diff --git a/ext/php_colopl_timeshifter.h b/ext/php_colopl_timeshifter.h
index 5f41752..ea49896 100644
--- a/ext/php_colopl_timeshifter.h
+++ b/ext/php_colopl_timeshifter.h
@@ -29,7 +29,7 @@ bool get_is_hooked();
 extern zend_module_entry colopl_timeshifter_module_entry;
 # define phpext_colopl_timeshifter_ptr &colopl_timeshifter_module_entry
 
-# define PHP_COLOPL_TIMESHIFTER_VERSION "1.1.6"
+# define PHP_COLOPL_TIMESHIFTER_VERSION "1.1.7"
 
 ZEND_BEGIN_MODULE_GLOBALS(colopl_timeshifter)
 	struct pdo_dbh_methods hooked_mysql_driver_methods;
diff --git a/library_test.sh b/library_test.sh
index 088fb7f..197b269 100755
--- a/library_test.sh
+++ b/library_test.sh
@@ -12,5 +12,4 @@ cd "/project"
   composer install
   composer exec -- phpunit "tests"
   composer exec -- phpstan
-  composer exec -- psalm
 cd -
diff --git a/psalm.xml b/psalm.xml
deleted file mode 100644
index 8552af6..0000000
--- a/psalm.xml
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0"?>
-<psalm
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xmlns="https://getpsalm.org/schema/config"
-    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
-    xmlns:xi="http://www.w3.org/2001/XInclude"
-    findUnusedBaselineEntry="true"
-    findUnusedCode="false"
->
-    <projectFiles>
-        <directory name="src"/>
-        <directory name="tests"/>
-    </projectFiles>
-    <plugins>
-        <pluginClass xmlns="https://getpsalm.org/schema/config" class="Psalm\PhpUnitPlugin\Plugin"/>
-    </plugins>
-</psalm>
diff --git a/src/Manager.php b/src/Manager.php
index 1841281..08485f3 100644
--- a/src/Manager.php
+++ b/src/Manager.php
@@ -71,11 +71,8 @@ public static function hookDateInterval(\DateInterval $dateInterval): bool
          */
         $actualInterval = clone $dateInterval;
         if (is_int($actualInterval->days) && $actualInterval->days > 0 && $actualInterval->days !== $actualInterval->d) {
-            /** @psalm-suppress InaccessibleProperty */
             $actualInterval->d = $actualInterval->days;
-            /** @psalm-suppress InaccessibleProperty */
             $actualInterval->y = 0;
-            /** @psalm-suppress InaccessibleProperty */
             $actualInterval->m = 0;
         }