--- title: 'How to upgrade PHP from version 8.1 to 8.4' url: 'https://ra1ahq.blog/en/kak-obnovit-php-s-versii-8-1-na-8-4' markdown: 'https://ra1ahq.blog/en/kak-obnovit-php-s-versii-8-1-na-8-4.md' lang: en date: '2026-08-14' description: 'In 2026, there are two ways to update PHP. Introd' taxonomy: category: - blog tag: - Linux archives_month: - aug_2026 archives_year: - '2026' --- # How to upgrade PHP from version 8.1 to 8.4 14 August 2026 ![How to upgrade PHP from version 8.1 to 8.4](https://ra1ahq.blog/images/a/8/d/d/a/a8ddae733ceff6b34418219bdb060b8c7c707c5f-solution1title.png)14:58 ### How to upgrade PHP from version 8.1 to 8.4 [Linux](https://ra1ahq.blog/en/tag:Linux) 14 August 2026 14:58 In 2026, there are two ways to update PHP. ### Introduction Many versions of Linux still use PHP 8.1. Modern projects may require a newer version of 8.3 or 8.4 to run. The latest version available for installation is PHP 8.5. **First way**- installing PHP 8.3, 8.4 or 8.5 from the oandrej PPA repository ``` sudo add-apt-repository ppa:ondrej/apache2 sudo LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php ``` **Second way**- installing PHP from a third-party deb repository https://packages.sury.org/php/ In the article I looked at the second method - deb from packages.sury.org/php/. ### How to install new versions of PHP First of all, I recommend disabling the previous repository and removing the outdated PHP7. ``` sudo add-apt-repository --remove ppa:ondrej/php sudo apt remove php7* ``` Message: > This repository is in the process of being merged into https://packages.sury.org/php/ If you read on the website file [README.txt](https://packages.sury.org/php/README.txt), the installation path is as follows: 1\) prepare for installation: update the package cache and install the utilities that are needed to download the repository key file from the Internet. ``` sudo apt-get update sudo apt-get -y install lsb-release ca-certificates curl ``` 2\) from the debsuryorg-archive-keyring.deb package downloaded from https://packages.sury.org/ install the repository signing key on your local PC. First, download the package installation DEB file to the tmp folder: ``` curl -sSLo /tmp/debsuryorg-archive-keyring.deb \ https://packages.sury.org/debsuryorg-archive-keyring.deb ``` Then install the package with the key ``` sudo dpkg -i /tmp/debsuryorg-archive-keyring.deb ``` The key will appear in the /usr/share/keyrings/ folder, where is the name of the keychain file:`debsuryorg-archive-keyring.gpg` 3\) In the /etc/apt/sources.list.d/ folder, create an entry for the new repository The php.list file has one line content: `deb [signed-by=/usr/share/keyrings/debsuryorg-archive-keyring.gpg] https://packages.sury.org/php/ jammy main` Where instead of jammy you need to indicate the code name of your distribution. The distribution name can be found with the command ``` lsb_release -a ``` You can also find out the codename by the Linux version number. The most popular versions of Linux have code words: - Ubuntu 20.04 LTS -**focal** - Ubuntu 22.04 LTS -**jammy** - Ubuntu 24.04 LTS -**noble** - Linux Mint 21 -**jammy** - Linux Mint 22 -**noble** - Debian 11 -**bullseye** - Debian 12 -**bookworm** - Debian 13 -**trixie** 4\) Installing php 8.4 ``` sudo apt-get update sudo apt-get install php8.4-common ``` 5\) Checking the PHP version ``` php --version ``` Output: `PHP 8.4.24` The PHP version has been updated successfully. ### Problems and solutions In Linux Mint 21, there was an issue updating php8.4-gd due to a dependency on libgd3, which requires a version >= 2.3.3, but the installation candidate in the repository is 2.3.0. Solution: The Linux operating system repository priority may be higher than that of a third-party repository, preventing programs and libraries from being installed from the third-party repository. **Creating a file to indicate installation priority, i.e. pinning packages to a repository: APT Pinning** ``` sudo nano /etc/apt/preferences ``` File Contents: ``` Package: libgd3 Pin: release o=deb.sury.org Pin-Priority: 1001 Package: php* Pin: release o=deb.sury.org Pin-Priority: 1001 ``` 1001 - means the highest priority, which is higher than that of the OS system repository. Previously, the LibGD3 library from the Ubuntu system repository conflicted with the PHP graphics module requirement `php8.4-gd` use LibGD3 version 2.3.3, - in the system repository version 2.3.0, - version 2.3.3 from the deb.sury.org repository will be installed as having a higher priority of 1001. The command says this: ``` apt-cache policy libgd3 ``` Now there will be no error. We do it as usual: ``` sudo apt-get update sudo apt-get install php8.4-common ``` ### Checking PHP version ``` php --version ``` ### Switching PHP version in OS by default Only if the PHP version is not the one required: ``` sudo update-alternatives --config php ``` ### Installing the Apache HTTP Server Module ``` sudo apt-get install libapache2-mod-php8.4 ``` ### Causes of the error "undefined constant IMG\_JPG" When running a PHP project that uses graphics, you may receive an error regarding IMG\_JPG If you have completed the previous steps (installing php one of the latest 8.x versions), you need to additionally install the module: ``` sudo apt-get install libgd3 sudo apt-get install php8.4-gd ``` ### List of Apache2 modules to install For the project, I additionally installed the Apache web server packages and modules: ``` sudo apt install php8.4 php8.4-cli php8.4-common sudo apt install libapache2-mod-php8.4 sudo apt install php8.4-curl php8.4-intl php8.4-mbstring php8.4-mysql sudo apt install php8.4-readline php8.4-xml php8.4-yaml php8.4-zip php8.4-apcu ``` ### Enabling the PHP module ``` sudo a2enmod php8.4 sudo service apache2 restart ``` ### Switching FastCGI FPM / regular module configuration The status of the module can be found with the command ``` sudo systemctl status php8.4-fpm ``` If the FPM module doesn't exist or the FPM version is the same as PHP (i.e. 8.4), do nothing. 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