diff --git a/capa/engine.py b/capa/engine.py
index 8ae36d3e..7e6d66f2 100644
--- a/capa/engine.py
+++ b/capa/engine.py
@@ -304,7 +304,7 @@ def match(rules: List["capa.rules.Rule"], features: FeatureSet, addr: Address) -
     other strategies can be imagined that match differently; implement these elsewhere.
     specifically, this routine does "top down" matching of the given rules against the feature set.
     """
-    results = collections.defaultdict(list)  # type: MatchResults
+    results: MatchResults = collections.defaultdict(list)
 
     # copy features so that we can modify it
     # without affecting the caller (keep this function pure)
diff --git a/rules b/rules
index 99aefcba..d923cf4b 160000
--- a/rules
+++ b/rules
@@ -1 +1 @@
-Subproject commit 99aefcbae5a1704949933cc38afe077a0ccd273c
+Subproject commit d923cf4b8f22936e0fde88e490ebf2c02a37f91f