diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6e25052d..b30fd154 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,7 +55,7 @@ jobs:
 
       # python setup
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/CHANGES.rst b/CHANGES.rst
index 82cf50af..b53871f2 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,8 +4,12 @@ Changelog
 8.4.3 (unreleased)
 ------------------
 
-- Nothing changed yet.
-
+- Avoided failure in v4 migration when default types are AT
+  [sgeulette]
+- Updated registry after settings schema change
+  [sgeulette]
+- Handled decoding exception
+  [sgeulette]
 
 8.4.2 (2021-04-08)
 ------------------
diff --git a/src/collective/solr/indexer.py b/src/collective/solr/indexer.py
index decc4032..6f33d93f 100644
--- a/src/collective/solr/indexer.py
+++ b/src/collective/solr/indexer.py
@@ -392,7 +392,12 @@ def getData(self, obj, attributes=None):
                 separator = getattr(field, "separator", " ")
                 value = separator.join(value)
             if isinstance(value, six.binary_type):
-                value = value.decode("utf-8")
+                for encod in ('utf-8', 'latin-1'):
+                    try:
+                        value = value.decode(encod)
+                        break
+                    except Exception:  # noqa
+                        pass
             data[name] = value
         missing = set(schema.requiredFields) - set(data.keys())
         return data, missing
diff --git a/src/collective/solr/setuphandlers.py b/src/collective/solr/setuphandlers.py
index 4754632a..d9269c37 100644
--- a/src/collective/solr/setuphandlers.py
+++ b/src/collective/solr/setuphandlers.py
@@ -35,6 +35,10 @@ def update_registry(context):
 
 
 def migrateTo4(context):
+    setup_tool = getToolByName(context, "portal_setup")
+    setup_tool.runImportStepFromProfile(PROFILE_ID, "plone.app.registry")
+    logger.info("Updated registry records to add force_simple_search record")
+
     registry = getUtility(IRegistry)
     if "collective.solr.async" in registry.records:
         old_record = registry.records["collective.solr.async"]
@@ -58,7 +62,7 @@ def migrateTo4(context):
         if type_id not in pt.objectIds():
             continue
         fti = pt[type_id]
-        if new_behavior not in fti.behaviors:
+        if new_behavior not in getattr(fti, 'behaviors', [new_behavior]):
             fti.behaviors += (new_behavior,)
             logger.info("Added new behavior to {}".format(type_id))