diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index ed2aae3b..d225f2e0 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -5,5 +5,5 @@ message = :bookmark: Bump version: {current_version} → {new_version}
 tag = True
 
 [bumpversion:file:simzoo/version.py]
-
 [bumpversion:file:setup.cfg]
+[bumpversion:file:package.json]
\ No newline at end of file
diff --git a/.github/workflows/update_semver.yml b/.github/workflows/autotag_ci.yml
similarity index 100%
rename from .github/workflows/update_semver.yml
rename to .github/workflows/autotag_ci.yml
diff --git a/.github/workflows/release-changelog-builder-config.json b/.github/workflows/release-changelog-builder-config.json
new file mode 100644
index 00000000..d47a5cb5
--- /dev/null
+++ b/.github/workflows/release-changelog-builder-config.json
@@ -0,0 +1,32 @@
+{
+  "categories": [
+    {
+      "title": "## 🚀 Features",
+      "labels": ["feature"]
+    },
+    {
+      "title": "## 🐛 Fixes",
+      "labels": ["fix"]
+    },
+    {
+      "title": "## 🧪 Tests",
+      "labels": ["test"]
+    },
+    {
+      "title": "## 📝 Tests",
+      "labels": ["docs"]
+    },
+    {
+      "title": "## 💚 CI",
+      "labels": ["CI"]
+    },
+    {
+      "title": "## 🔒 Security",
+      "labels": ["security"]
+    },
+    {
+      "title": "## 🔄 Dependency updates",
+      "labels": ["dependencies"]
+    }
+  ]
+}
diff --git a/.github/workflows/release_ci.yml b/.github/workflows/release_ci.yml
new file mode 100644
index 00000000..c5e65266
--- /dev/null
+++ b/.github/workflows/release_ci.yml
@@ -0,0 +1,124 @@
+# Github action that makes sure that all the version tags are up to date when
+# A new version tag is added.
+name: Ex3_ekf release CI
+on:
+  push:
+    tags:
+      - v*.*.*
+jobs:
+  update-code-version:
+    runs-on: ubuntu-latest
+    if: github.event.action != 'labeled'
+    steps:
+      # NOTE: Updates the version that is specified in the code files.
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.ref }}
+          fetch-depth: 0
+      - name: Get current semver tag
+        id: get_semver
+        uses: rickstaa/action-get-semver@v1
+        with:
+          verbose: "true"
+      # Use bumpversion to update version in code
+      # See. https://pypi.org/project/bump2version/
+      - name: Set up Python environment
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+      - name: Cache python environment
+        uses: actions/cache@v2
+        id: cache-python-env
+        with:
+          path: ${{ env.pythonLocation }}
+          key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}-${{ hashFiles('setup.cfg') }}-${{ hashFiles('pyproject.toml') }}-bumpversion
+      - name: Update pip
+        if: steps.cache-python-env.outputs.cache-hit != 'true'
+        run: |
+          python -m pip install --upgrade pip
+      - name: Install bump2version
+        if: steps.cache-python-env.outputs.cache-hit != 'true'
+        run: |
+          pip install bump2version
+      - name: Make sure the version in all code files is correct
+        run: |
+          bumpversion --no-tag --no-commit --new-version ${{ steps.get_semver.outputs.current_version }} patch
+      - name: Commit code version changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          branch: main
+          commit_message: ":bookmark: Updates documentation version to ${{ steps.get_semver.outputs.current_version }}"
+  release-changelog:
+    runs-on: ubuntu-latest
+    needs: update-code-version
+    if: github.event.action != 'labeled'
+    steps:
+      # NOTE: Makes sure the changelog is up to date.
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.ref }}
+          fetch-depth: 0
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "12"
+      - name: Install auto-changelog
+        run: npm install
+      - name: Create CHANGELOG.md file using auto-changelog
+        run: npm run auto-changelog
+      - name: Commit changelog changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          branch: main
+          commit_message: ":memo: Updates CHANGELOG.md"
+  move-semver-tags:
+    runs-on: ubuntu-latest
+    needs: release-changelog
+    if: github.event.action != 'labeled'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          ref: main
+          fetch-depth: 0
+      - name: Get latest semver tag
+        id: get_semver
+        uses: rickstaa/action-get-semver@v1
+        with:
+          verbose: "true"
+      - name: Updates major and minor version tags
+        uses: rickstaa/action-update-semver@v1
+        with:
+          tag: "${{ steps.get_semver.outputs.current_version }}"
+  create-pre-release:
+    # NOTE: Creates a pre-release for the new tag
+    runs-on: ubuntu-latest
+    needs: move-semver-tags
+    if: github.event.action != 'labeled'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          ref: main
+          fetch-depth: 0
+      - name: Get latest semver tag
+        id: get_semver
+        uses: rickstaa/action-get-semver@v1
+        with:
+          verbose: "true"
+      - name: Build release changelog
+        id: build_changelog
+        uses: mikepenz/release-changelog-builder-action@main
+        env:
+          configuration: ".github/workflows/release-changelog-builder-config.json"
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create pre-release
+        uses: actions/create-release@v1
+        with:
+          tag_name: ${{ steps.get_semver.outputs.current_version }}
+          release_name: ${{ steps.get_semver.outputs.current_version }}
+          body: ${{ steps.build_changelog.outputs.changelog }}
+          prerelease: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/package.json b/package.json
new file mode 100644
index 00000000..4c340552
--- /dev/null
+++ b/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "Simzoo",
+  "version": "0.2.2",
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:rickstaa/simzoo.git"
+  },
+  "license": "UNLICENSED",
+  "devDependencies": {
+    "auto-changelog": "^2.2.1"
+  },
+  "scripts": {
+    "auto-changelog": "auto-changelog -p && git add CHANGELOG.md"
+  },
+  "auto-changelog": {
+    "output": "CHANGELOG.md",
+    "template": "keepachangelog",
+    "unreleased": false,
+    "commitLimit": false
+  }
+}
diff --git a/simzoo/envs/README.md b/simzoo/envs/README.md
new file mode 100644
index 00000000..f826d1ad
--- /dev/null
+++ b/simzoo/envs/README.md
@@ -0,0 +1,6 @@
+# envs
+
+This folder contains the following submodules:
+
+-   [ex3_ekf](https://github.com/rickstaa/ex3-ekf):A gym environment for a noisy master-slave system.
+-   [oscillator](https://github.com/rickstaa/oscillator):A gym environment for a synthetic oscillatory network of transcriptional regulators called a repressilator.
diff --git a/simzoo/envs/ex3_ekf b/simzoo/envs/ex3_ekf
index 2d0d0286..3e72b960 160000
--- a/simzoo/envs/ex3_ekf
+++ b/simzoo/envs/ex3_ekf
@@ -1 +1 @@
-Subproject commit 2d0d02869c1ec11193973bd5ce186253e6aa60a3
+Subproject commit 3e72b960827904272046ab4479f0c3c40189cb02
diff --git a/simzoo/envs/oscillator b/simzoo/envs/oscillator
index 0c6b6db8..a9a6f5ea 160000
--- a/simzoo/envs/oscillator
+++ b/simzoo/envs/oscillator
@@ -1 +1 @@
-Subproject commit 0c6b6db8704dbab609738413d0f0d51b5a2ff03a
+Subproject commit a9a6f5eaf00ee6dc22af2b7c55e5b7d848ad4dab