diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 2ded5ab..8021c5e 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -39,7 +39,7 @@ jobs:
         id: composer-cache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
@@ -71,7 +71,7 @@ jobs:
         id: composer-cache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
@@ -104,7 +104,7 @@ jobs:
         id: composer-cache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3b5636..5f03968 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,11 @@ about writing changes to this log.
 
 ## [Unreleased]
 
+## [2.2.1]
+
+- Allowed `os2forms/os2forms` 4.0.
+- Updated GitHub action dependencies. 
+
 ## [2.2.0]
 
 - Avoided loading submissions through `webform_submission` storage.
@@ -44,7 +49,8 @@ about writing changes to this log.
 
 - Release 1.0.0
 
-[Unreleased]: https://github.com/OS2Forms/os2forms_rest_api/compare/2.2.0...HEAD
+[Unreleased]: https://github.com/OS2Forms/os2forms_rest_api/compare/2.2.1...HEAD
+[2.2.1]: https://github.com/OS2Forms/os2forms_rest_api/compare/2.2.0...2.2.1
 [2.2.0]: https://github.com/OS2Forms/os2forms_rest_api/compare/2.1.0...2.2.0
 [2.1.0]: https://github.com/OS2Forms/os2forms_rest_api/compare/2.0.3...2.1.0
 [2.0.3]: https://github.com/OS2Forms/os2forms_rest_api/compare/2.0.2...2.0.3
diff --git a/composer.json b/composer.json
index 54a6c51..e4c46e3 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
         "cweagans/composer-patches": "^1.7",
         "drupal/key_auth": "^2.0",
         "drupal/webform_rest": "^4.1",
-        "os2forms/os2forms": "^3.13"
+        "os2forms/os2forms": "^3.13 || ^4.0"
     },
     "require-dev": {
         "dealerdirect/phpcodesniffer-composer-installer": "^0.7.2",