diff --git a/.github/workflows/main_merge_check.yml b/.github/workflows/main_merge_check.yml
new file mode 100644
index 0000000..8e6f5c5
--- /dev/null
+++ b/.github/workflows/main_merge_check.yml
@@ -0,0 +1,14 @@
+name: Check merging branch
+
+on:
+  pull_request:
+
+jobs:
+  check_branch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check branch
+        if: github.base_ref == 'main' && github.head_ref != 'dev'
+        run: |
+          echo "ERROR: You can only merge to main from dev."
+          exit 1
\ No newline at end of file
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 2d1bb35..e3c79b8 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,7 +10,6 @@ repos:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
     -   id: check-yaml
-    -   id: check-added-large-files
 - repo: https://github.com/astral-sh/ruff-pre-commit
   # Ruff version.
   rev: v0.3.4
diff --git a/src/cryo_challenge/__init__.py b/src/cryo_challenge/__init__.py
index e69de29..cafea4e 100644
--- a/src/cryo_challenge/__init__.py
+++ b/src/cryo_challenge/__init__.py
@@ -0,0 +1 @@
+from cryo_challenge.__about__ import __version__
\ No newline at end of file