diff --git a/shard.yml b/shard.yml
index 830c2c0..cc50ced 100644
--- a/shard.yml
+++ b/shard.yml
@@ -13,4 +13,4 @@ license: MIT
 development_dependencies:
   ameba:
     github: crystal-ameba/ameba
-    version: ~> 0.13.1
+    version: ~> 0.14.3
diff --git a/src/spectator/matchers/array_matcher.cr b/src/spectator/matchers/array_matcher.cr
index 77dc14c..bb355a3 100644
--- a/src/spectator/matchers/array_matcher.cr
+++ b/src/spectator/matchers/array_matcher.cr
@@ -110,9 +110,9 @@ module Spectator::Matchers
         end
       end.reject do |(_, count)|
         count <= 0
-      end.map do |(element, count)|
+      end.flat_map do |(element, count)|
         Array.new(count, element)
-      end.flatten
+      end
     end
 
     private def unexpected(value, label)
diff --git a/src/spectator/matchers/respond_matcher.cr b/src/spectator/matchers/respond_matcher.cr
index 6d36f80..1f73f57 100644
--- a/src/spectator/matchers/respond_matcher.cr
+++ b/src/spectator/matchers/respond_matcher.cr
@@ -27,7 +27,8 @@ module Spectator::Matchers
     # A successful match with `#match` should normally fail for this method, and vice-versa.
     def negated_match(actual : Expression(T)) : MatchData forall T
       snapshot = snapshot_values(actual.value)
-      if snapshot.values.any?
+      # Intentionally check truthiness of each value.
+      if snapshot.values.any? # ameba:disable Performance/AnyInsteadOfEmpty
         FailedMatchData.new(description, "#{actual.label} responds to #{label}", values(snapshot).to_a)
       else
         SuccessfulMatchData.new(description)