diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index d4782abe..9b204da6 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -11,10 +11,10 @@ jobs:
 
     steps:
       - name: Set up Python environment
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
-          python-version: "3.8"
-      - uses: actions/checkout@v2
+          python-version: "3.10"
+      - uses: actions/checkout@v3
       - name: Updated documentation
         run: |
           git config --global user.email "${{ github.actor }}@users.noreply.github.com"
diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index f76ee6b2..17eb3b1c 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -20,10 +20,10 @@ jobs:
 
     steps:
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index e75c0e06..c0a3629b 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -13,13 +13,13 @@ jobs:
     name: Lint
     steps:
       - name: Check out source repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up Python environment
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: "3.10"
       - name: flake8 Lint
-        uses: py-actions/flake8@v1
+        uses: py-actions/flake8@v2
         with:
           ignore: "E501"
           exclude: "__init__.py, input/__init__.py"
diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index de2b0ca3..536f7d53 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -25,10 +25,10 @@ jobs:
 
     steps:
       - name: Checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6381fba6..d7b5835d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,13 +2,17 @@
 
 All notable changes to this project will be documented in this file.
 
-## [2.4.0] - 2022-xx-xx
+## [2.4.0] - 2022-12-01
 ### Added
 - Log-derivatives and symmetric log-effective mass added.
 - Covariance for irregular Monte Carlo chains sped up.
+- Additional checks in `Corr.GEVP` added.
 
 ### Fixed
 - Bug in `Obs.details` fixed which appeared when tau had zero error.
+- Bug in `input.json` export in connection with `numpy.int64` fixed.
+- Small bug fixes in `input.openQCD`.
+
 
 
 ## [2.3.1] - 2022-10-19
diff --git a/pyerrors/version.py b/pyerrors/version.py
index fc1038a9..3d67cd6b 100644
--- a/pyerrors/version.py
+++ b/pyerrors/version.py
@@ -1 +1 @@
-__version__ = "2.4.0+dev"
+__version__ = "2.4.0"