diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9cbf0c906d5b2a7a931dc078d640386340da8162..65a5f37affc425adc1e236c8a84ce65d4c198783 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -74,8 +74,8 @@ jobs:
             # If nixpkgs changes then potentially a lot of cached packages for
             # the base system will be invalidated so we may as well drop them
             # and make a new cache with the new packages.
-            - paymentserver-nix-store-v6-{{ checksum "nix/sources.json" }}
-            - paymentserver-nix-store-v6-
+            - paymentserver-nix-store-v7-{{ checksum "nix/sources.json" }}
+            - paymentserver-nix-store-v7-
 
       - run:
           name: "Building with Nix"
@@ -104,7 +104,7 @@ jobs:
 
       - save_cache:
           name: "Cache Nix Store Paths"
-          key: paymentserver-nix-store-v6-{{ checksum "nix/sources.json" }}
+          key: paymentserver-nix-store-v7-{{ checksum "nix/sources.json" }}
           paths:
             - "/nix"