diff --git a/ops/modules/builderball.nix b/ops/modules/builderball.nix
index 9c416affc..9b77e893e 100644
--- a/ops/modules/builderball.nix
+++ b/ops/modules/builderball.nix
@@ -14,7 +14,7 @@ in
     enable = lib.mkEnableOption description;
 
     caches = lib.mkOption {
-      type = with lib.types; listOf string;
+      type = with lib.types; listOf str;
       description = "Public addresses of caches to use";
 
       default = [
diff --git a/ops/modules/prometheus-fail2ban-exporter.nix b/ops/modules/prometheus-fail2ban-exporter.nix
index 349364f9b..504b7e5dc 100644
--- a/ops/modules/prometheus-fail2ban-exporter.nix
+++ b/ops/modules/prometheus-fail2ban-exporter.nix
@@ -10,7 +10,7 @@ in
 
     interval = mkOption {
       description = "Systemd calendar expression for how often to run the interval";
-      type = types.string;
+      type = types.str;
       default = "minutely";
       example = "hourly";
     };
diff --git a/users/aspen/xanthous/server/module.nix b/users/aspen/xanthous/server/module.nix
index 6d1bdc687..8950f2e8d 100644
--- a/users/aspen/xanthous/server/module.nix
+++ b/users/aspen/xanthous/server/module.nix
@@ -27,7 +27,7 @@ in
       };
 
       ed25519SecretKeyFile = mkOption {
-        type = with types; uniq string;
+        type = with types; uniq str;
         description = "Path to the ed25519 secret key for the server";
       };
     };