diff --git a/.drone.yml b/.drone.yml
index 855536b..84805c2 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,9 +7,9 @@ steps:
 - name: test
   commands:
   - nix-build -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz -A sops-install-secrets.tests
-  - nix-build -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-20.09.tar.gz -A sops-install-secrets.tests
+  - nix-build -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-21.05.tar.gz -A sops-install-secrets.tests
 ---
 kind: signature
-hmac: 6cd4aeea3ec1f0b37d44edb6db25764fcae5aa68215ffa0a542cb6e47a54cfa5
+hmac: df547336a0317ffe1dd419138c0552b79189c7caf0cc86c98bba9ca5bea22ea9
 
 ...
diff --git a/flake.lock b/flake.lock
index 3359a48..9364b74 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1625223284,
-        "narHash": "sha256-jjLcDSU1rRiJb+n3uez23XAa7kbnPcGZTa6jIKh1GMQ=",
+        "lastModified": 1636228094,
+        "narHash": "sha256-CpOcIwHAn3yS0PeVmUICFrJ+gde2PiZp3XsnDP3LE9w=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "357d2c8f6087685fe35cb1889a005a4dd4cce7b8",
+        "rev": "2606cb0fc24e65f489b7d9fdcbf219756e45db35",
         "type": "github"
       },
       "original": {