diff --git a/spec/tester_mongo/Gemfile.lock b/spec/tester_mongo/Gemfile.lock
index 255e12a1..c27c7e2a 100644
--- a/spec/tester_mongo/Gemfile.lock
+++ b/spec/tester_mongo/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
     base64 (0.2.0)
     bcrypt (3.1.20)
     benchmark (0.4.0)
-    bigdecimal (3.1.8)
+    bigdecimal (3.1.9)
     bootsnap (1.18.4)
       msgpack (~> 1.2)
     bson (5.0.2)