diff --git a/.github/workflows/bc.yml b/.github/workflows/bc.yml
index 9127600..f8cc564 100644
--- a/.github/workflows/bc.yml
+++ b/.github/workflows/bc.yml
@@ -1,8 +1,28 @@
 on:
-  - pull_request
-  - push
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - 'README.md'
+      - 'CHANGELOG.md'
+      - '.gitignore'
+      - '.gitattributes'
+      - 'infection.json.dist'
+      - 'phpunit.xml.dist'
+      - 'psalm.xml'
+  push:
+    branches: ['master']
+    paths-ignore:
+      - 'docs/**'
+      - 'README.md'
+      - 'CHANGELOG.md'
+      - '.gitignore'
+      - '.gitattributes'
+      - 'infection.json.dist'
+      - 'phpunit.xml.dist'
+      - 'psalm.xml'
 
 name: backwards compatibility
+
 jobs:
   roave_bc_check:
     uses: yiisoft/actions/.github/workflows/bc.yml@master
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e96052e..68fac01 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -31,4 +31,4 @@ jobs:
       os: >-
         ['ubuntu-latest', 'windows-latest']
       php: >-
-        ['8.0', '8.1', '8.2', '8.3']
+        ['8.0', '8.1', '8.2', '8.3', '8.4']
diff --git a/.github/workflows/composer-require-checker.yml b/.github/workflows/composer-require-checker.yml
index 5473ec9..632bfd4 100644
--- a/.github/workflows/composer-require-checker.yml
+++ b/.github/workflows/composer-require-checker.yml
@@ -31,4 +31,4 @@ jobs:
       os: >-
         ['ubuntu-latest']
       php: >-
-        ['8.0', '8.1', '8.2', '8.3']
+        ['8.0', '8.1', '8.2', '8.3', '8.4']
diff --git a/.github/workflows/rector.yml b/.github/workflows/rector.yml
index 35411d0..5d6931d 100644
--- a/.github/workflows/rector.yml
+++ b/.github/workflows/rector.yml
@@ -1,5 +1,5 @@
 on:
-  pull_request:
+  pull_request_target:
     paths-ignore:
       - 'docs/**'
       - 'README.md'
@@ -17,7 +17,8 @@ jobs:
     secrets:
       token: ${{ secrets.YIISOFT_GITHUB_TOKEN }}
     with:
+      repository: ${{ github.event.pull_request.head.repo.full_name }}
       os: >-
         ['ubuntu-latest']
       php: >-
-        ['8.3']
+        ['8.4']
diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 8694d2d..0a323eb 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -29,4 +29,4 @@ jobs:
       os: >-
         ['ubuntu-latest']
       php: >-
-        ['8.0', '8.1', '8.2', '8.3']
+        ['8.0', '8.1', '8.2', '8.3', '8.4']
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 756807e..bf2944e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## 2.2.1 under development
 
-- no changes in this release.
+- Chg #111: Change PHP constraint in `composer.json` to `8.0 - 8.4` (@vjik)
 
 ## 2.2.0 December 25, 2023
 
diff --git a/composer.json b/composer.json
index 77d4db3..5efed6c 100644
--- a/composer.json
+++ b/composer.json
@@ -27,21 +27,21 @@
         }
     ],
     "require": {
-        "php": "^8.0",
-        "psr/container": "^1.0|^2.0",
+        "php": "8.0 - 8.4",
+        "psr/container": "^1.0 || ^2.0",
         "yiisoft/definitions": "^3.1",
         "yiisoft/factory": "^1.2",
         "yiisoft/friendly-exception": "^1.0",
-        "yiisoft/html": "^2.0|^3.0"
+        "yiisoft/html": "^2.0 || ^3.0"
     },
     "require-dev": {
-        "maglnet/composer-require-checker": "^4.2",
-        "phpunit/phpunit": "^9.5",
-        "rector/rector": "^1.0.0",
-        "roave/infection-static-analysis-plugin": "^1.16",
-        "spatie/phpunit-watcher": "^1.23",
-        "vimeo/psalm": "^4.30|^5.4",
-        "yiisoft/test-support": "^3.0"
+        "maglnet/composer-require-checker": "^4.4",
+        "phpunit/phpunit": "^9.6.22",
+        "rector/rector": "^1.2.10",
+        "roave/infection-static-analysis-plugin": "^1.25",
+        "spatie/phpunit-watcher": "^1.23.6",
+        "vimeo/psalm": "^4.30 || ^5.26.1 || ^6.9.1",
+        "yiisoft/test-support": "^3.0.2"
     },
     "autoload": {
         "psr-4": {
@@ -75,4 +75,4 @@
             "composer/package-versions-deprecated": true
         }
     }
-}
\ No newline at end of file
+}
diff --git a/psalm.xml b/psalm.xml
index 590dd10..35f3898 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -3,6 +3,7 @@
     errorLevel="1"
     findUnusedBaselineEntry="true"
     findUnusedCode="false"
+    ensureOverrideAttribute="false"
     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"