diff --git a/chainsyncer/backend/file.py b/chainsyncer/backend/file.py
index 316d571..0c2622b 100644
--- a/chainsyncer/backend/file.py
+++ b/chainsyncer/backend/file.py
@@ -54,8 +54,12 @@ class FileBackend(Backend):
     :param base_dir: Base directory to use for generation. Default is value of BACKEND_BASE_DIR
     :type base_dir: str 
     """
+    __warned = False
 
     def __init__(self, chain_spec, object_id, base_dir=BACKEND_BASE_DIR):
+        if not FileBackend.__warned:
+            logg.warning('file backend for chainsyncer is experimental and not yet guaranteed to handle interrupted filter execution.')
+            FileBackend.__warned = True
         super(FileBackend, self).__init__(object_id, flags_reversed=True)
         self.object_data_dir = data_dir_for(chain_spec, object_id, base_dir=base_dir)
 
@@ -394,6 +398,11 @@ class FileBackend(Backend):
         return entries[len(entries)-1]
 
 
+    # n is zero-index of bit field
+    def begin_filter(self, n, base_dir=BACKEND_BASE_DIR):
+        pass
+
+
     # n is zero-index of bit field
     def complete_filter(self, n, base_dir=BACKEND_BASE_DIR):
         """Sets the filter at the given index as completed.
diff --git a/requirements.txt b/requirements.txt
index 87c56a2..2ed8768 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-confini>=0.3.6rc3,<0.5.0
+confini~=0.5.1
 semver==2.13.0
-hexathon~=0.0.1a8
-chainlib>=0.0.10a4,<=0.1.0
+hexathon~=0.1.0
+chainlib~=0.0.10
diff --git a/setup.cfg b/setup.cfg
index 40266b6..16d8364 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = chainsyncer
-version = 0.0.7a3
+version = 0.0.7
 description = Generic blockchain syncer driver
 author = Louis Holbrook
 author_email = dev@holbrook.no