diff --git a/Gemfile.lock b/Gemfile.lock
index 32b32b416..1da6d73a6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -423,7 +423,7 @@ GEM
     pg (1.1.4)
     pghero (2.3.0)
       activerecord (>= 5)
-    pkg-config (1.3.7)
+    pkg-config (1.3.8)
     premailer (1.11.1)
       addressable
       css_parser (>= 1.6.0)