diff --git a/dotfiles/config/taffybar/flake.lock b/dotfiles/config/taffybar/flake.lock
index 123e447f..274bf410 100644
--- a/dotfiles/config/taffybar/flake.lock
+++ b/dotfiles/config/taffybar/flake.lock
@@ -136,15 +136,16 @@
         "xmonad-contrib": "xmonad-contrib"
       },
       "locked": {
-        "lastModified": 1781159184,
-        "narHash": "sha256-w5drkb9QGCQMphSyyh1SplfH74hMib+eZ74rra/8yQk=",
+        "lastModified": 1781172310,
+        "narHash": "sha256-mBd3obUUS+ICqL+U2bOanGwaGl2rfbMZdGzAFiqRSaE=",
         "owner": "taffybar",
         "repo": "taffybar",
-        "rev": "f160fcd1dff1c5fcf8331d3b5b86aec0a36346eb",
+        "rev": "7beecc89928df669281977e41ceed213c5ede88f",
         "type": "github"
       },
       "original": {
         "owner": "taffybar",
+        "ref": "anthropic-usage-rate-limit-backoff",
         "repo": "taffybar",
         "type": "github"
       }
diff --git a/dotfiles/config/taffybar/flake.nix b/dotfiles/config/taffybar/flake.nix
index c1e36a5b..91edb319 100644
--- a/dotfiles/config/taffybar/flake.nix
+++ b/dotfiles/config/taffybar/flake.nix
@@ -3,7 +3,9 @@
     taffybar = {
       # Keep the default source usable in CI. Local iteration uses
       # IMALISON_TAFFYBAR_LIVE_CHECKOUT below via `just switch-local-taffybar`.
-      url = "github:taffybar/taffybar";
+      # Pinned to the rate-limit-backoff PR branch (taffybar/taffybar#681);
+      # revert to master after it merges.
+      url = "github:taffybar/taffybar/anthropic-usage-rate-limit-backoff";
       inputs.weeder-nix = {
         url = "github:NorfairKing/weeder-nix";
         inputs.pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";
diff --git a/nixos/flake.lock b/nixos/flake.lock
index 69a47207..76cda36b 100644
--- a/nixos/flake.lock
+++ b/nixos/flake.lock
@@ -2160,15 +2160,16 @@
         "xmonad-contrib": "xmonad-contrib"
       },
       "locked": {
-        "lastModified": 1781159184,
-        "narHash": "sha256-w5drkb9QGCQMphSyyh1SplfH74hMib+eZ74rra/8yQk=",
+        "lastModified": 1781172310,
+        "narHash": "sha256-mBd3obUUS+ICqL+U2bOanGwaGl2rfbMZdGzAFiqRSaE=",
         "owner": "taffybar",
         "repo": "taffybar",
-        "rev": "f160fcd1dff1c5fcf8331d3b5b86aec0a36346eb",
+        "rev": "7beecc89928df669281977e41ceed213c5ede88f",
         "type": "github"
       },
       "original": {
         "owner": "taffybar",
+        "ref": "anthropic-usage-rate-limit-backoff",
         "repo": "taffybar",
         "type": "github"
       }