diff --git a/boards/forms.py b/boards/forms.py
--- a/boards/forms.py
+++ b/boards/forms.py
@@ -87,7 +87,7 @@ class NeboardForm(forms.Form):
     def as_json_errors(self):
         errors = []
 
-        for name, field in self.fields.items():
+        for name, field in list(self.fields.items()):
             if self[name].errors:
                 errors.append({
                     'field': name,
diff --git a/boards/views/all_threads.py b/boards/views/all_threads.py
--- a/boards/views/all_threads.py
+++ b/boards/views/all_threads.py
@@ -115,7 +115,7 @@ class AllThreadsView(PostMixin, BaseBoar
 
         text = self._remove_invalid_links(text)
 
-        if FORM_IMAGE in data.keys():
+        if FORM_IMAGE in list(data.keys()):
             image = data[FORM_IMAGE]
         else:
             image = None
diff --git a/boards/views/thread.py b/boards/views/thread.py
--- a/boards/views/thread.py
+++ b/boards/views/thread.py
@@ -119,7 +119,7 @@ class ThreadView(BaseBoardView, PostMixi
 
         text = self._remove_invalid_links(text)
 
-        if FORM_IMAGE in data.keys():
+        if FORM_IMAGE in list(data.keys()):
             image = data[FORM_IMAGE]
         else:
             image = None