diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df42071..d7f4f04 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -158,10 +158,10 @@ jobs:
       # would have. Pinned rather than floating: a green run should mean this
       # code passed against a known compiler, not against whatever was newest
       # that morning.
-      - name: Install twill v1.12.0
+      - name: Install twill v1.13.0
         run: |
           curl -fsSL -o twill \
-            https://github.com/twill-lang/twill/releases/download/v1.12.0/twill-v1.12.0-linux-amd64
+            https://github.com/twill-lang/twill/releases/download/v1.13.0/twill-v1.13.0-linux-amd64
           chmod +x twill
           ./twill --version
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6e609f3..9fb9395 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@
 
 ### Changed
 
+- **Take twill 1.13.0.** twill 1.13.0 is released, so the pin follows it.
+  `spool.toml`, CI and the README install line move from 1.12.0 to 1.13.0. The
+  floor stays 1.11.0, the release with `std/test`; this is a currency bump, so
+  no source or test changed and the seven suites pass unchanged on 1.13.0.
 - **The suites are written with `std/test`.** `tests/harness.tw` is deleted.
   It was the fourth copy of the same harness across four repositories, and
   `docs/needs.md` entry 12 said a `std/test` was what would delete it. twill
diff --git a/README.md b/README.md
index 36ac996..8788d3f 100644
--- a/README.md
+++ b/README.md
@@ -32,11 +32,11 @@ You need twill 1.11.0 or newer, because the suites are written with `std/test`,
 which arrived in 1.11. Get one:
 
 ```bash
-curl -fsSL -o twill https://github.com/twill-lang/twill/releases/download/v1.12.0/twill-v1.12.0-linux-amd64
+curl -fsSL -o twill https://github.com/twill-lang/twill/releases/download/v1.13.0/twill-v1.13.0-linux-amd64
 chmod +x twill
 ```
 
-The asset name is `twill-v1.12.0-<os>-<arch>`: `linux-amd64`, `linux-arm64`,
+The asset name is `twill-v1.13.0-<os>-<arch>`: `linux-amd64`, `linux-arm64`,
 `darwin-amd64`, `darwin-arm64`, `windows-amd64.exe`.
 
 The suite needs a checkout of [selvedge](https://github.com/twill-lang/selvedge)
diff --git a/spool.toml b/spool.toml
index bb2f3d4..77c61e9 100644
--- a/spool.toml
+++ b/spool.toml
@@ -11,7 +11,7 @@ entry = "src/predict.tw"
 # The language itself, pinned to the release whose std modules and tensor
 # builtins this source was written against. spool has no notion of a toolchain
 # dependency, so it is declared as an ordinary git dependency.
-twill = { version = "^1.12.0", git = "https://github.com/twill-lang/twill" }
+twill = { version = "^1.13.0", git = "https://github.com/twill-lang/twill" }
 
 # Reading model archives. A real dependency and not a convenience: loading
 # through selvedge gets the model's declared input and output shapes out of the