diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 98ce84b..14beb8b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,11 @@ jobs:
       uses: actions/checkout@v4
     
     - name: Install Nix
-      uses: cachix/install-nix-action@v27
+      # v27 ships Nix 2.22, which is old enough to mis-handle several flake
+      # locking features (notably nested `a.inputs.b.inputs.c.follows` and the
+      # precedence of an --override-input'd input's own lock). v31 ships 2.35,
+      # matching what logos-standalone-app already uses.
+      uses: cachix/install-nix-action@v31
       with:
         extra_nix_config: |
           experimental-features = nix-command flakes
diff --git a/flake.lock b/flake.lock
index d12a29c..e80d082 100644
--- a/flake.lock
+++ b/flake.lock
@@ -12183,11 +12183,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1785523697,
-        "narHash": "sha256-8WdoCJDLNR/aLkcmeY8CeAZlTIN8ulG/7N1ZFEVDdsQ=",
+        "lastModified": 1786030193,
+        "narHash": "sha256-Z5rxmZBMJsNsUSb37ljbDMKrtrds9Enw5oPJcf8wbVU=",
         "owner": "logos-co",
         "repo": "logos-protocol",
-        "rev": "3a31c91d1322dae053bbe28b6e3f441fabcc2162",
+        "rev": "0f26ffdeef18fb9582dc0a95e2bee482464da40d",
         "type": "github"
       },
       "original": {