diff --git a/Gemfile.lock b/Gemfile.lock
index f5282a37..b224ce97 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -171,7 +171,7 @@ GEM
     parser (3.3.5.0)
       ast (~> 2.4.1)
       racc
-    pg (1.5.8)
+    pg (1.5.9)
     prism (1.2.0)
     psych (5.1.2)
       stringio
diff --git a/gemset.nix b/gemset.nix
index 22864cb0..a5f0d491 100644
--- a/gemset.nix
+++ b/gemset.nix
@@ -671,10 +671,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0dsgcmzc55w7i9cpghfkzhmiskzndvp1vijd8c5ryv8xvlwikmzg";
+      sha256 = "1p2gqqrm895fzr9vi8d118zhql67bm8ydjvgqbq1crdnfggzn7kn";
       type = "gem";
     };
-    version = "1.5.8";
+    version = "1.5.9";
   };
   prism = {
     groups = ["default" "development"];