diff --git a/.circleci/config.yml b/.circleci/config.yml
index ec30b48dbffb7cd29fe66e1974b8842508fccc5b..a51cbb601c07a94bb57b4561a89cb9df64a47795 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -82,9 +82,9 @@ 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-v1-{{ checksum "nixpkgs.rev" }}-{{ checksum "ristretto.nix" }}
-            - paymentserver-nix-store-v1-{{ checksum "nixpkgs.rev" }}-
-            - paymentserver-nix-store-v1-
+            - paymentserver-nix-store-v2-{{ checksum "nixpkgs.rev" }}-{{ checksum "ristretto.nix" }}
+            - paymentserver-nix-store-v2-{{ checksum "nixpkgs.rev" }}-
+            - paymentserver-nix-store-v2-
 
       - restore_cache:
           # Restore the cache of Stack's state.  This will have all of the
@@ -156,7 +156,7 @@ jobs:
 
       - save_cache:
           name: "Cache Nix Store Paths"
-          key: paymentserver-nix-store-v1-{{ checksum "nixpkgs.rev" }}-{{ checksum "ristretto.nix" }}
+          key: paymentserver-nix-store-v2-{{ checksum "nixpkgs.rev" }}-{{ checksum "ristretto.nix" }}
           paths:
             - "/nix"