diff --git a/docs/manual/release-notes/rl-0.9.md b/docs/manual/release-notes/rl-0.9.md
index afd2530e..8f9f3b47 100644
--- a/docs/manual/release-notes/rl-0.9.md
+++ b/docs/manual/release-notes/rl-0.9.md
@@ -2,6 +2,8 @@
 
 ## Breaking changes
 
+- Upgrade to nixpkgs 26.06.
+
 - Nixpkgs has merged a fully incompatible rewrite of
   `vimPlugins.nvim-treesitter`. Namely, it changes from the frozen `master`
   branch to the new main branch. This change removes incremental selections, so
diff --git a/flake.lock b/flake.lock
index 042e8f09..9bb22002 100644
--- a/flake.lock
+++ b/flake.lock
@@ -74,16 +74,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1780749050,
-        "narHash": "sha256-3av0pIjlOWQ6rDbNOmpUSvbNnJkGORQKKjb4LtCZsIY=",
+        "lastModified": 1781216227,
+        "narHash": "sha256-9mUW6gNwoN2SWc/l0fW4svPNOulXLl8ijqKyeSOGgJE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "a799d3e3886da994fa307f817a6bc705ae538eeb",
+        "rev": "a0374025a863d007d98e3297f6aa46cc3141c2f0",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-unstable",
+        "ref": "nixos-26.05",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index fd3404e9..321171d9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -122,7 +122,7 @@
     systems.url = "github:nix-systems/default";
 
     ## Basic Inputs
-    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-26.05";
 
     flake-parts = {
       url = "github:hercules-ci/flake-parts";