diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e3a502d15..862a2ca2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ on:
   pull_request:
 
 env:
-  PHP_VERSION: 8.4
+  PHP_VERSION: 8.5
   CYPRESS_PROJECT_ID: w8t3fx
 
 jobs:
diff --git a/.github/workflows/pull-locales.yml b/.github/workflows/pull-locales.yml
index 7533b0138..ca20b3777 100644
--- a/.github/workflows/pull-locales.yml
+++ b/.github/workflows/pull-locales.yml
@@ -11,7 +11,7 @@ on:
     - cron: "0 * * * *"
 
 env:
-  PHP_VERSION: 8.4
+  PHP_VERSION: 8.5
 
 jobs:
   pull-locales:
diff --git a/.github/workflows/upload-locales.yml b/.github/workflows/upload-locales.yml
index 8974834f6..38bf68ec6 100644
--- a/.github/workflows/upload-locales.yml
+++ b/.github/workflows/upload-locales.yml
@@ -12,7 +12,7 @@ on:
       - "develop"
 
 env:
-  PHP_VERSION: 8.4
+  PHP_VERSION: 8.5
 
 jobs:
   pull-locales:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a4b621f7..61f31ac69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Bump base PHP image to 8.5 ([#2814])
+
 ## [v4.12.0] - 2026-02-09
 
 ### Added
@@ -680,6 +684,7 @@ You can find the changelog for older versions there [here](https://github.com/TH
 [#2789]: https://github.com/THM-Health/PILOS/pull/2789
 [#2798]: https://github.com/THM-Health/PILOS/pull/2798
 [#2809]: https://github.com/THM-Health/PILOS/pull/2809
+[#2814]: https://github.com/THM-Health/PILOS/pull/2814
 [unreleased]: https://github.com/THM-Health/PILOS/compare/v4.12.0...develop
 [v3.0.0]: https://github.com/THM-Health/PILOS/releases/tag/v3.0.0
 [v3.0.1]: https://github.com/THM-Health/PILOS/releases/tag/v3.0.1
diff --git a/composer.json b/composer.json
index 413779239..39fdcdb2d 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
   ],
   "license": "MIT",
   "require": {
-    "php": "^8.4",
+    "php": "^8.5",
     "ext-curl": "*",
     "ext-json": "*",
     "ext-redis": "*",
diff --git a/docker/app/Dockerfile b/docker/app/Dockerfile
index ae8d87534..a8118cefa 100644
--- a/docker/app/Dockerfile
+++ b/docker/app/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:8.4-fpm-alpine
+FROM php:8.5-fpm-alpine
 
 LABEL maintainer="Samuel Weirich"
 LABEL description="Development and production container for PILOS, compatible with laravel sail; heavily inspired by offical image"