diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 61200366..3e9b444d 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -9,4 +9,4 @@ on:
 
 jobs:
   Docs:
-    uses: tskit-dev/.github/.github/workflows/docs.yml@v15
+    uses: tskit-dev/.github/.github/workflows/docs.yml@v17
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index f4d71157..e72945be 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -5,4 +5,4 @@ on:
 
 jobs:
   Lint:
-    uses: tskit-dev/.github/.github/workflows/lint.yml@v15
+    uses: tskit-dev/.github/.github/workflows/lint.yml@v17
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 019489d9..0e35a07a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,25 +10,25 @@ jobs:
 
   packaging:
     name: Python packaging
-    uses: tskit-dev/.github/.github/workflows/python-packaging.yml@v15
+    uses: tskit-dev/.github/.github/workflows/python-packaging.yml@v17
     with:
       cli-test-cmd: tsinfer --help
 
   test-c:
     name: C tests
-    uses: tskit-dev/.github/.github/workflows/c-tests.yml@v15
+    uses: tskit-dev/.github/.github/workflows/c-tests.yml@v17
     with:
       library-directory: lib
     secrets: inherit
 
   test-python-c:
     name: Python-C tests
-    uses: tskit-dev/.github/.github/workflows/python-c-tests.yml@v15
+    uses: tskit-dev/.github/.github/workflows/python-c-tests.yml@v17
     secrets: inherit
 
   test:
     name: Python
-    uses: tskit-dev/.github/.github/workflows/python-tests.yml@v16
+    uses: tskit-dev/.github/.github/workflows/python-tests.yml@v17
     with:
       os: ${{ matrix.os }}
       python-version: ${{ matrix.python }}
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index a570ca30..14751bfa 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   build-wheels:
-    uses: tskit-dev/.github/.github/workflows/build-wheels.yml@v15
+    uses: tskit-dev/.github/.github/workflows/build-wheels.yml@v17
 
   publish:
     runs-on: ubuntu-24.04
diff --git a/pyproject.toml b/pyproject.toml
index d99551ac..ca8a2e81 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,7 +58,7 @@ dependencies = [
     "zarr>=3",
     "bio2zarr",
     "click",
-    "vcztools>=0.1.2",
+    "vcztools==0.1.2",
 ]
 
 [project.urls]
diff --git a/uv.lock b/uv.lock
index 08ecdede..312de647 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2919,7 +2919,7 @@ requires-dist = [
     { name = "psutil" },
     { name = "tqdm" },
     { name = "tskit", specifier = ">=1.0.0" },
-    { name = "vcztools", specifier = ">=0.1.2" },
+    { name = "vcztools", specifier = "==0.1.2" },
     { name = "zarr", specifier = ">=3" },
 ]