diff --git a/src/oca_github_bot/tasks/merge_bot.py b/src/oca_github_bot/tasks/merge_bot.py
index eb7b8197..906a0328 100644
--- a/src/oca_github_bot/tasks/merge_bot.py
+++ b/src/oca_github_bot/tasks/merge_bot.py
@@ -133,13 +133,11 @@ def _merge_bot_merge_pr(org, repo, merge_bot_branch, cwd, dry_run=False):
     check_call(["git", "fetch", "origin", f"refs/pull/{pr}/head:tmp-pr-{pr}"], cwd=cwd)
     check_call(["git", "checkout", f"tmp-pr-{pr}"], cwd=cwd)
     modified_addon_dirs, _, _ = git_modified_addon_dirs(cwd, target_branch)
-    # Run main branch bot actions before bump version.
-    # Do not run the main branch bot if there are no modified addons,
-    # because it is dedicated to addons repos.
     check_call(["git", "checkout", merge_bot_branch], cwd=cwd)
 
-    # remove not installable addons (case where an addons becomes no more
-    # installable).
+    head_sha = github.git_get_head_sha(cwd)
+
+    # list installable modified addons only
     modified_installable_addon_dirs = [
         d for d in modified_addon_dirs if is_addon_dir(d, installable_only=True)
     ]
@@ -158,19 +156,30 @@ def _merge_bot_merge_pr(org, repo, merge_bot_branch, cwd, dry_run=False):
             cwd,
         )
 
-    if modified_addon_dirs:
-        # this includes setup.py and README.rst generation
-        main_branch_bot_actions(org, repo, target_branch, cwd=cwd)
-
-    for addon_dir in modified_installable_addon_dirs:
-        # TODO wlc lock and push
-        # TODO msgmerge and commit
-        if bumpversion_mode != "nobump":
+    # bump manifest version of modified installable addons
+    if bumpversion_mode != "nobump":
+        for addon_dir in modified_installable_addon_dirs:
             # bumpversion is last commit (after readme generation etc
             # and before building wheel),
             # so setuptools-odoo generates a round version number
             # (without .dev suffix).
             bump_manifest_version(addon_dir, bumpversion_mode, git_commit=True)
+
+    # run the main branch bot actions only if there are modified addon directories,
+    # so we don't run them when the merge bot branch for non-addons repos
+    if modified_addon_dirs:
+        # this includes setup.py and README.rst generation
+        main_branch_bot_actions(org, repo, target_branch, cwd=cwd)
+
+    # squash post merge commits into one (bumpversion, readme generator, etc),
+    # to avoid a proliferation of automated actions commits
+    if github.git_get_head_sha(cwd) != head_sha:
+        check_call(["git", "reset", "--soft", head_sha], cwd=cwd)
+        check_call(
+            ["git", "commit", "-m", "oca-github-bot post-merge updates"], cwd=cwd
+        )
+
+    for addon_dir in modified_installable_addon_dirs:
         build_and_check_wheel(addon_dir)
 
     if dry_run: