diff --git a/src/kup/__main__.py b/src/kup/__main__.py
index 4bc60d8..d0d64c1 100644
--- a/src/kup/__main__.py
+++ b/src/kup/__main__.py
@@ -34,6 +34,7 @@
     K_FRAMEWORK_BINARY_CACHE_NAME,
     K_FRAMEWORK_CACHE,
     K_FRAMEWORK_PUBLIC_KEY,
+    PROFILE_ADD_COMMAND,
     USER_IS_TRUSTED,
     ask_install_substituters,
     get_extra_substituters_from_flake,
@@ -520,7 +521,7 @@ def install_package(
         if package_name.base in installed_packages:
             nix(['profile', 'remove', str(package.index)], is_install=False)
         nix(
-            ['profile', 'install', pinned_package_cache[package.uri]],
+            ['profile', PROFILE_ADD_COMMAND, pinned_package_cache[package.uri]],
             verbose=VERBOSE,
         )
     else:
@@ -538,7 +539,7 @@ def install_package(
         if package_name.base in installed_packages:
             nix(['profile', 'remove', str(package.index)], is_install=False)
         nix(
-            ['profile', 'install', package.uri] + overrides + git_token_options,
+            ['profile', PROFILE_ADD_COMMAND, package.uri] + overrides + git_token_options,
             extra_substituters=package.substituters,
             extra_public_keys=package.public_keys,
             verbose=VERBOSE,
diff --git a/src/kup/nix.py b/src/kup/nix.py
index c0cba54..251c73a 100644
--- a/src/kup/nix.py
+++ b/src/kup/nix.py
@@ -102,6 +102,24 @@ def nix_raw(
     .replace('"', '')
 )
 
+# `nix profile install` was renamed to `nix profile add` in Nix 2.30.
+# Use the appropriate command to avoid deprecation warnings on newer Nix versions.
+# https://nix.dev/manual/nix/2.30/release-notes/rl-2.30.html#backward-incompatible-changes-and-deprecations
+PROFILE_ADD_COMMAND = (
+    nix_raw(
+        [
+            'eval',
+            '--impure',
+            '--expr',
+            'if builtins.compareVersions builtins.nixVersion "2.30pre" == -1 then "install" else "add"',
+        ],
+        extra_flags=[],
+    )
+    .decode('utf8')
+    .strip()
+    .replace('"', '')
+)
+
 USER = pwd.getpwuid(os.getuid())[0]
 USER_IS_ROOT = os.geteuid() == 0