diff --git a/.github/FUNDING.yaml b/.github/FUNDING.yml
similarity index 100%
rename from .github/FUNDING.yaml
rename to .github/FUNDING.yml
diff --git a/.github/ISSUE_TEMPLATE/1-bug.yaml b/.github/ISSUE_TEMPLATE/1-bug.yml
similarity index 100%
rename from .github/ISSUE_TEMPLATE/1-bug.yaml
rename to .github/ISSUE_TEMPLATE/1-bug.yml
diff --git a/.github/ISSUE_TEMPLATE/2-feature.yaml b/.github/ISSUE_TEMPLATE/2-feature.yml
similarity index 100%
rename from .github/ISSUE_TEMPLATE/2-feature.yaml
rename to .github/ISSUE_TEMPLATE/2-feature.yml
diff --git a/.github/ISSUE_TEMPLATE/3-docs.yaml b/.github/ISSUE_TEMPLATE/3-docs.yml
similarity index 100%
rename from .github/ISSUE_TEMPLATE/3-docs.yaml
rename to .github/ISSUE_TEMPLATE/3-docs.yml
diff --git a/.github/ISSUE_TEMPLATE/config.yaml b/.github/ISSUE_TEMPLATE/config.yml
similarity index 100%
rename from .github/ISSUE_TEMPLATE/config.yaml
rename to .github/ISSUE_TEMPLATE/config.yml
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yml
similarity index 100%
rename from .github/workflows/ci.yaml
rename to .github/workflows/ci.yml
diff --git a/.github/workflows/docker-image.yaml b/.github/workflows/docker-image.yml
similarity index 100%
rename from .github/workflows/docker-image.yaml
rename to .github/workflows/docker-image.yml
diff --git a/.github/workflows/forum.yaml b/.github/workflows/forum.yml
similarity index 100%
rename from .github/workflows/forum.yaml
rename to .github/workflows/forum.yml
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yml
similarity index 100%
rename from .github/workflows/release.yaml
rename to .github/workflows/release.yml
diff --git a/Cargo.toml b/Cargo.toml
index a70f13a38..03141cbbf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ resolver = "2"
 
 [workspace.package]
 version = "0.13.1"
-rust-version = "1.83" # also change in ci.yaml
+rust-version = "1.83" # also change in ci.yml
 authors = ["The Typst Project Developers"]
 edition = "2021"
 homepage = "https://typst.app"
diff --git a/crates/typst-cli/Cargo.toml b/crates/typst-cli/Cargo.toml
index 7fc1951f1..7e9b93f93 100644
--- a/crates/typst-cli/Cargo.toml
+++ b/crates/typst-cli/Cargo.toml
@@ -83,7 +83,7 @@ vendor-openssl = ["typst-kit/vendor-openssl"]
 workspace = true
 
 # The following metadata is used by `cargo-binstall`, and should be synchronized
-# with `.github/workflows/release.yaml`.
+# with `.github/workflows/release.yml`.
 [package.metadata.binstall]
 pkg-url = "{ repo }/releases/download/v{ version }/typst-{ target }{ archive-suffix }"
 bin-dir = "typst-{ target }/typst{ binary-ext }"
diff --git a/crates/typst-cli/src/update.rs b/crates/typst-cli/src/update.rs
index 316ccf160..ec8ca71e8 100644
--- a/crates/typst-cli/src/update.rs
+++ b/crates/typst-cli/src/update.rs
@@ -19,7 +19,7 @@ const TYPST_REPO: &str = "typst";
 
 /// Determine the asset to download based on the target platform.
 ///
-/// See `.github/workflows/release.yaml` for the list of prebuilt assets.
+/// See `.github/workflows/release.yml` for the list of prebuilt assets.
 macro_rules! determine_asset {
     () => {
         // For some platforms, only some targets are prebuilt in the release.
diff --git a/docs/reference/groups.yaml b/docs/reference/groups.yml
similarity index 100%
rename from docs/reference/groups.yaml
rename to docs/reference/groups.yml
diff --git a/docs/src/lib.rs b/docs/src/lib.rs
index 6b3646c3f..b81f0dc66 100644
--- a/docs/src/lib.rs
+++ b/docs/src/lib.rs
@@ -35,7 +35,7 @@ macro_rules! load {
 
 static GROUPS: LazyLock<Vec<GroupData>> = LazyLock::new(|| {
     let mut groups: Vec<GroupData> =
-        yaml::from_str(load!("reference/groups.yaml")).unwrap();
+        yaml::from_str(load!("reference/groups.yml")).unwrap();
     for group in &mut groups {
         if group.filter.is_empty() {
             group.filter = group