diff --git a/Gemfile.lock b/Gemfile.lock
index 250f857cd..66805010e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -450,7 +450,7 @@ GEM
     pg (1.4.2)
     pghero (2.8.3)
       activerecord (>= 5)
-    pkg-config (1.4.7)
+    pkg-config (1.4.9)
     posix-spawn (0.3.15)
     premailer (1.14.2)
       addressable