diff --git a/.agents/skills/tool_usage/SKILL.md b/.agents/skills/tool_usage/SKILL.md
index cc28cd1b1170..bac2c0ec4e6c 100644
--- a/.agents/skills/tool_usage/SKILL.md
+++ b/.agents/skills/tool_usage/SKILL.md
@@ -19,18 +19,18 @@ We use `bazelisk` for build and test.
 
 **IMPORTANT**: AI assistants use `bazelisk` instead of `bazel`.
 
-## Pre-commit
+## Prek
 
-Running `pre-commit` is mandatory. To run it on all files:
+Running `prek` is mandatory. To run it on all files:
 
 ```bash
-pre-commit run -a
+prek run -a
 ```
 
 To validate a specific list of files:
 
 ```bash
-pre-commit run --files <files>
+prek run --files <files>
 ```
 
 ## Command line tools restrictions
diff --git a/.github/workflows/README.md b/.github/workflows/README.md
index 1345883b62f2..28e74fbd78da 100644
--- a/.github/workflows/README.md
+++ b/.github/workflows/README.md
@@ -19,7 +19,7 @@ Most jobs only have a few endpoints, but due to tools which do downloads, a few
 have significantly more. These are:
 
 -   clangd_tidy.yaml (Bazel)
--   pre_commit.yaml (Bazel, pre-commit)
+-   prek.yaml (Bazel, prek)
 -   nightly_release.yaml (Bazel)
 -   tests.yaml (Bazel)
 
diff --git a/.github/workflows/pre_commit.yaml b/.github/workflows/prek.yaml
similarity index 83%
rename from .github/workflows/pre_commit.yaml
rename to .github/workflows/prek.yaml
index f268f2085fe6..689b32206b98 100644
--- a/.github/workflows/pre_commit.yaml
+++ b/.github/workflows/prek.yaml
@@ -2,7 +2,7 @@
 # Exceptions. See /LICENSE for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-name: pre-commit
+name: prek
 
 on:
   pull_request:
@@ -14,7 +14,7 @@ permissions:
   contents: read # For actions/checkout.
 
 jobs:
-  pre-commit:
+  prek:
     runs-on: ubuntu-22.04
     steps:
       - name: Harden Runner
@@ -57,22 +57,22 @@ jobs:
           matrix_runner: ubuntu-22.04
           remote_cache_upload: '--remote_upload_local_results=false'
 
-      - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
+      - uses: j178/prek-action@01345c78b7de7d79edf368729212760396ba9345 # v2
 
-      # We want to automatically create github suggestions for pre-commit file
+      # We want to automatically create github suggestions for prek file
       # changes for a pull request. But `pull_request` actions never have write
       # permissions to the repository, so we create the suggestions in a separate
-      # privileged `workflow_run` action in pre_commit_suggestions.yaml. Here,
+      # privileged `workflow_run` action in prek_suggestions.yaml. Here,
       # we upload the diffs and event configuration to an artifact for use by
       # that action.
-      - name: Collect pre-commit output
+      - name: Collect prek output
         if: failure()
         run: |
-          mkdir -p pre-commit-output
-          git diff > pre-commit-output/diff
-          cp $GITHUB_EVENT_PATH pre-commit-output/event
+          mkdir -p prek-output
+          git diff > prek-output/diff
+          cp $GITHUB_EVENT_PATH prek-output/event
       - uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         if: failure()
         with:
-          name: pre-commit output
-          path: pre-commit-output/*
+          name: prek output
+          path: prek-output/*
diff --git a/.github/workflows/pre_commit_suggestions.yaml b/.github/workflows/prek_suggestions.yaml
similarity index 81%
rename from .github/workflows/pre_commit_suggestions.yaml
rename to .github/workflows/prek_suggestions.yaml
index 82fb173499b2..aa68150cb4a2 100644
--- a/.github/workflows/pre_commit_suggestions.yaml
+++ b/.github/workflows/prek_suggestions.yaml
@@ -2,11 +2,11 @@
 # Exceptions. See /LICENSE for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-# Create PR suggestions based on problems found by pre-commit action.
-name: 'Add pre-commit suggestions'
+# Create PR suggestions based on problems found by prek action.
+name: 'Add prek suggestions'
 
-# This action is run whenever the `pre-commit` action finishes. Because the
-# `pre-commit` action is an unprivileged action running on (for example) the
+# This action is run whenever the `prek` action finishes. Because the
+# `prek` action is an unprivileged action running on (for example) the
 # `pull_request` event, it's run without write permissions to the repository, so
 # we use a separate privileged `workflow_run` action here to pick up its results
 # and convert them into suggestion comments.
@@ -15,7 +15,7 @@ name: 'Add pre-commit suggestions'
 # this file will not take effect until they are merged to trunk.
 on:
   workflow_run:
-    workflows: [pre-commit]
+    workflows: [prek]
     types:
       - completed
 
@@ -25,7 +25,7 @@ permissions:
 
 jobs:
   pull-request-suggestions:
-    # Only generate suggestions if pre-commit for a PR failed.
+    # Only generate suggestions if prek for a PR failed.
     if: |
       github.event.workflow_run.conclusion == 'failure' &&
       github.event.workflow_run.event == 'pull_request'
@@ -49,15 +49,15 @@ jobs:
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
-      - name: Download pre-commit output
+      - name: Download prek output
         uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:
-          name: pre-commit output
+          name: prek output
           github-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ github.event.workflow_run.id }}
 
       # Use https://github.com/reviewdog/reviewdog to create PR suggestions
-      # matching the diff that pre-commit created.
+      # matching the diff that prek created.
       - name: Create suggestions
         env:
           REVIEWDOG_GITHUB_API_TOKEN:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7ad4441d4e36..72fc6ba80850 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,8 +11,7 @@ default_language_version:
   python: python3 # Defaults to python2, so override it.
 
 repos:
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: 3e8a8703264a2f4a69428a0aa4dcb512790b2c8c # frozen: v6.0.0
+  - repo: builtin
     hooks:
       - id: check-added-large-files
       - id: check-case-conflict
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e43ae049a0ad..ad7d03ed5f52 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -227,7 +227,7 @@ trying to write proposals, both types of contributor access will help.
 Please see our [contribution tool](/docs/project/contribution_tools.md)
 documentation for information on setting up a git client for Carbon development,
 as well as helpful tooling that will ease the contribution process. For example,
-[pre-commit](https://pre-commit.com) is used to simplify
+[prek](https://github.com/j178/prek) is used to simplify
 [code review](/docs/project/code_review.md).
 
 #### Using AI-based contribution tools
@@ -407,7 +407,7 @@ Changes to Carbon documentation follow the
 
 Markdown files should additionally use [Prettier](https://prettier.io) for
 formatting, which we automate with
-[pre-commit](/docs/project/contribution_tools.md#main-tools).
+[prek](/docs/project/contribution_tools.md#running-prek).
 
 Other style points to be aware of are:
 
diff --git a/docs/project/contribution_tools.md b/docs/project/contribution_tools.md
index 8deea62e3a5a..a9c95e76c911 100644
--- a/docs/project/contribution_tools.md
+++ b/docs/project/contribution_tools.md
@@ -20,7 +20,7 @@ contributions.
     -   [macOS](#macos)
 -   [Tools](#tools)
     -   [Main tools](#main-tools)
-        -   [Running pre-commit](#running-pre-commit)
+        -   [Running prek](#running-prek)
     -   [Optional tools](#optional-tools)
         -   [Jujutsu (`jj`)](#jujutsu-jj)
         -   [AI assistants](#ai-assistants)
@@ -58,17 +58,19 @@ sudo apt install \
   libc++-dev \
   libc++abi-dev \
   lld \
-  lldb \
-  pre-commit
+  lldb
 
 # Install `uv` for Python scripts.
 curl -LsSf https://astral.sh/uv/install.sh | sh
 
+# Install `prek` for Git hooks.
+cargo install --locked prek
+
 # Set up git.
 # If you don't already have a fork:
 gh repo fork --clone carbon-language/carbon-lang
 cd carbon-lang
-pre-commit install
+prek install
 
 # Run tests.
 ./scripts/run_bazelisk.py test //...:all
@@ -123,14 +125,14 @@ brew install \
   gh \
   llvm \
   uv \
-  pre-commit
+  prek
 
 # IMPORTANT: Make sure `llvm` is added to the PATH! It's separate from `brew`.
 
 # Set up git.
 gh repo fork --clone carbon-language/carbon-lang
 cd carbon-lang
-pre-commit install
+prek install
 
 # Run tests. Note homebrew makes `bazel` an alias to `bazelisk`.
 bazel test //...:all
@@ -179,31 +181,36 @@ These tools are essential for work on Carbon.
             issues, see
             [troubleshooting build issues](#troubleshooting-build-issues).
     -   [gh CLI](https://github.com/cli/cli): Helps with GitHub.
-    -   [pre-commit](https://pre-commit.com): Validates and cleans up git
-        commits.
+    -   [prek](https://github.com/j178/prek): Validates and cleans up commits.
     -   `autoupdate_testdata.py`: Updates expected output for tests.
         -   Usage: `./toolchain/autoupdate_testdata.py [files...]`
         -   This is essential when changes affect compiler output (diagnostics,
             SemIR, etc.).
 
-#### Running pre-commit
+#### Running prek
 
-[pre-commit](https://pre-commit.com) is typically set up using
-`pre-commit install`. When set up in this mode, it will check for issues when
-`git commit` is run. A typical commit workflow looks like:
+[prek](https://github.com/j178/prek) runs linters and formatters. It's a drop-in
+replacement for [pre-commit](https://pre-commit.com/).
 
-1.  `git commit` to try committing files. This automatically executes
-    `pre-commit run`, which may fail and leave files modified for cleanup.
-2.  `git add .` to add the automatically modifications done by `pre-commit`.
-3.  `git commit` again.
+To use it:
 
-You can also use `pre-commit run` to check pending changes without `git commit`,
-or `pre-commit run -a` to run on all files in the repository.
+1. Install it by way of `cargo install --locked prek`.
+2. Run `prek install` to set up the git hooks.
 
-> NOTE: Some developers prefer to run `pre-commit` on `git push` instead of
+A typical commit workflow looks like:
+
+1. `git commit` to try committing files. This automatically executes `prek run`,
+   which may fail and leave files modified for cleanup.
+2. `git add .` to add the automatic modifications done by hooks.
+3. `git commit` again.
+
+You can also use `prek run` to check pending changes without `git commit`, or
+`prek run -a` to run on all files in the repository.
+
+> NOTE: Some developers prefer to run `prek` on `git push` instead of
 > `git commit` because they want to commit files as originally authored instead
-> of with pre-commit modifications. To switch, run
-> `pre-commit uninstall && pre-commit install -t pre-push`.
+> of with automatic modifications. To switch, run
+> `prek uninstall && prek install --hook-type pre-push`.
 
 ### Optional tools
 
@@ -215,7 +222,7 @@ considering if they fit your workflow.
 -   `rs-git-fsmonitor` and Watchman: Helps make `git` run faster on large
     repositories.
     -   **WARNING**: Bugs in `rs-git-fsmonitor` and/or Watchman can result in
-        `pre-commit` deleting files. If you see files being deleted, disable
+        `prek` deleting files. If you see files being deleted, disable
         `rs-git-fsmonitor` with `git config --unset core.fsmonitor`.
 -   [vim-prettier](https://github.com/prettier/vim-prettier): A vim integration
     for [Prettier](https://prettier.io/), which we use for formatting.
@@ -309,8 +316,7 @@ allowlisting) are:
 bazelisk build
 bazelisk test
 bazelisk run //toolchain/testing:file_test --
-clang-format
-pre-commit run
+prek run
 ./toolchain/autoupdate_testdata.py
 
 # Shell commands. Note that these allow reading arbitrary files on your local
diff --git a/proposals/scripts/new_proposal.py b/proposals/scripts/new_proposal.py
index 396a21b7df74..f582bd344725 100755
--- a/proposals/scripts/new_proposal.py
+++ b/proposals/scripts/new_proposal.py
@@ -171,7 +171,7 @@ def main() -> None:
     else:
         git_bin = _find_tool("git")
         jj_bin = None
-    precommit_bin = _find_tool("pre-commit")
+    prek_bin = _find_tool("prek")
 
     # Verify there are no uncommitted changes (jj has no equivalent).
     if git_bin:
@@ -263,11 +263,11 @@ def main() -> None:
     with open(final_path, "w") as final_file:
         final_file.write(content)
 
-    # Run pre-commit for a ToC update, then push the PR update.
+    # Run prek for a ToC update, then push the PR update.
     final_desc = "Filling out template with PR %d" % pr_num
     if git_bin:
         _run([git_bin, "add", temp_path, final_path])
-        _run([precommit_bin, "run"], check=False)
+        _run([prek_bin, "run"], check=False)
         _run([git_bin, "commit", "--amend", "-m", final_desc])
 
         _run([git_bin, "push", "--force-with-lease"])
@@ -275,7 +275,7 @@ def main() -> None:
         assert jj_bin  # For mypy.
 
         _run(
-            [precommit_bin, "run", "--files", "$(jj diff --name-only)"],
+            [prek_bin, "run", "--files", "$(jj diff --name-only)"],
             check=False,
         )
         _run([jj_bin, "describe", "-m", final_desc])
diff --git a/scripts/bazel_mod_deps.py b/scripts/bazel_mod_deps.py
index 515994df249c..d59f21b820f5 100755
--- a/scripts/bazel_mod_deps.py
+++ b/scripts/bazel_mod_deps.py
@@ -5,7 +5,7 @@
 # ///
 
 
-"""Run `bazel mod deps` for pre-commit. Lets pre-commit handle modifications."""
+"""Run `bazel mod deps` for prek. Lets prek handle modifications."""
 
 __copyright__ = """
 Part of the Carbon Language project, under the Apache License v2.0 with LLVM
diff --git a/scripts/check_build_graph.py b/scripts/check_build_graph.py
index d5e9e30f2b47..5b91830f1b4a 100755
--- a/scripts/check_build_graph.py
+++ b/scripts/check_build_graph.py
@@ -5,7 +5,7 @@
 # ///
 
 
-"""Verify that the bazel build graph is in a valid state, for pre-commit."""
+"""Verify that the bazel build graph is in a valid state, for prek."""
 
 __copyright__ = """
 Part of the Carbon Language project, under the Apache License v2.0 with LLVM
diff --git a/scripts/run_buildifier.py b/scripts/run_buildifier.py
index 51400b2baa14..6bf4cedf9946 100755
--- a/scripts/run_buildifier.py
+++ b/scripts/run_buildifier.py
@@ -5,7 +5,7 @@
 # ///
 
 
-"""Runs buildifier on passed-in BUILD files, mainly for pre-commit."""
+"""Runs buildifier on passed-in BUILD files, mainly for prek."""
 
 __copyright__ = """
 Part of the Carbon Language project, under the Apache License v2.0 with LLVM
diff --git a/scripts/scripts_utils.py b/scripts/scripts_utils.py
index a874286cff30..6d797732a054 100644
--- a/scripts/scripts_utils.py
+++ b/scripts/scripts_utils.py
@@ -129,7 +129,7 @@ def _get_cached_binary(name: str, url: str, want_hash: str) -> str:
     cache_dir.mkdir(parents=True, exist_ok=True)
 
     # Hold a lock while checksumming and downloading the path. Otherwise,
-    # parallel runs by pre-commit may conflict with one another with
+    # parallel runs by prek may conflict with one another with
     # simultaneous downloads.
     with open(cache_dir.joinpath(f"{name}.lock"), "w") as lock_file:
         fcntl.lockf(lock_file.fileno(), fcntl.LOCK_EX)