diff --git a/AGENTS.md b/AGENTS.md
index d3e347402..fd0b7e5f5 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -718,7 +718,7 @@ half of that rationale fits it too. The exemption is about unification
 pressure and the runtime has none — the lockfile shows 25 crates
 depending on `tree-sitter-language` against one external dependent
 (`tree-sitter-perl`) for `tree-sitter` — and every manifest here already
-pins it at `=0.26.11` with the workspace resolving. Its ABI version is
+pins it at `=0.26.12` with the workspace resolving. Its ABI version is
 also what each vendored `parser.c` was generated against, so an
 accidental bump is precisely the drift the gate exists to catch.
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78b42576d..72af0e069 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -508,6 +508,21 @@ for historical reference.
 
 ### Changed
 
+- The `tree-sitter` runtime is `=0.26.12`, up one upstream patch
+  release, pinned in lockstep across the root manifest, `enums`, and
+  the five vendored `bca-tree-sitter-*` crates. `tree_sitter` is
+  re-exported from the library root, so the resolved version is visible
+  to consumers. Nothing in the release reaches this workspace's
+  behaviour: `include/tree_sitter/api.h` and the Rust bindings are
+  byte-identical to `0.26.11`, so `TREE_SITTER_LANGUAGE_VERSION` stays
+  at 15 and the vendored `parser.c` sources are unaffected, as is the
+  `Send + Sync` argument the PyO3 bindings rest on. The three C fixes
+  are an error-recovery restart when the parser is already in
+  `ERROR_STATE`, a `has_later_named_siblings` correction in the tree
+  cursor, and query-anchor semantics for skipped quantifiers — the
+  last inert here, since this workspace uses no tree-sitter query API.
+  No metric value moves.
+
 - Ruby's and Elixir's `#{` interpolation opener no longer counts as a
   Halstead operator. Unlike PHP's `{`, which aliases the
   compound-statement brace and was fabricating a block (see Fixed),
diff --git a/Cargo.lock b/Cargo.lock
index 40779025a..d9ddec1b8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4465,9 +4465,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/Cargo.toml b/Cargo.toml
index d1e574609..15c8e4179 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -56,7 +56,7 @@ authors = [
 # entries via `.workspace = true`, so any grammar bump here MUST be
 # applied to enums/Cargo.toml in lockstep (see recreate-grammars.sh).
 [workspace.dependencies]
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
 tree-sitter-bash = "=0.25.1"
 tree-sitter-c-sharp = "=0.23.5"
 tree-sitter-elixir = "=0.3.5"
diff --git a/big-code-analysis-py/src/node.rs b/big-code-analysis-py/src/node.rs
index b660ef6b0..bd9f11539 100644
--- a/big-code-analysis-py/src/node.rs
+++ b/big-code-analysis-py/src/node.rs
@@ -55,7 +55,7 @@
 //! the iterator's own keep-alive.
 //!
 //! `tree_sitter::Tree`, `Node`, and `TreeCursor` are `Send + Sync` under
-//! the pinned `=0.26.11`, so the pyclasses are sendable (no `unsendable`)
+//! the pinned `=0.26.12`, so the pyclasses are sendable (no `unsendable`)
 //! and compose with `ThreadPoolExecutor` fan-out like [`PyAst`] itself.
 
 use big_code_analysis::tree_sitter::{Node as TsNode, TreeCursor};
diff --git a/enums/Cargo.lock b/enums/Cargo.lock
index d913182e4..0359c2ea0 100644
--- a/enums/Cargo.lock
+++ b/enums/Cargo.lock
@@ -472,9 +472,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/enums/Cargo.toml b/enums/Cargo.toml
index 9b0de9aeb..075d7739b 100644
--- a/enums/Cargo.toml
+++ b/enums/Cargo.toml
@@ -26,7 +26,7 @@ askama = "^0.16"
 # [workspace.dependencies]. They MUST be kept in lockstep with the
 # matching block in ../Cargo.toml when grammars are bumped
 # (see recreate-grammars.sh).
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
 tree-sitter-bash = "=0.25.1"
 tree-sitter-c-sharp = "=0.23.5"
 tree-sitter-elixir = "=0.3.5"
diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index 576c76865..04634d4d0 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -621,9 +621,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/tree-sitter-ccomment/Cargo.lock b/tree-sitter-ccomment/Cargo.lock
index 07ab89fe8..2acb9cb21 100644
--- a/tree-sitter-ccomment/Cargo.lock
+++ b/tree-sitter-ccomment/Cargo.lock
@@ -185,9 +185,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/tree-sitter-ccomment/Cargo.toml b/tree-sitter-ccomment/Cargo.toml
index 3cff6fffb..f3c7f93a1 100644
--- a/tree-sitter-ccomment/Cargo.toml
+++ b/tree-sitter-ccomment/Cargo.toml
@@ -56,4 +56,4 @@ tree-sitter-language="0.1.0"
 cc = "^1.2"
 
 [dev-dependencies]
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
diff --git a/tree-sitter-mozcpp/Cargo.lock b/tree-sitter-mozcpp/Cargo.lock
index 4c50cddf7..867e42823 100644
--- a/tree-sitter-mozcpp/Cargo.lock
+++ b/tree-sitter-mozcpp/Cargo.lock
@@ -186,9 +186,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/tree-sitter-mozcpp/Cargo.toml b/tree-sitter-mozcpp/Cargo.toml
index 39f2df541..3640941ba 100644
--- a/tree-sitter-mozcpp/Cargo.toml
+++ b/tree-sitter-mozcpp/Cargo.toml
@@ -68,4 +68,4 @@ tree-sitter-cpp = "=0.23.4"
 build = ["tree-sitter-cpp"]
 
 [dev-dependencies]
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
diff --git a/tree-sitter-mozjs/Cargo.lock b/tree-sitter-mozjs/Cargo.lock
index a28e7cff6..378568f73 100644
--- a/tree-sitter-mozjs/Cargo.lock
+++ b/tree-sitter-mozjs/Cargo.lock
@@ -186,9 +186,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/tree-sitter-mozjs/Cargo.toml b/tree-sitter-mozjs/Cargo.toml
index 42172ddc2..b3b3124f2 100644
--- a/tree-sitter-mozjs/Cargo.toml
+++ b/tree-sitter-mozjs/Cargo.toml
@@ -70,4 +70,4 @@ tree-sitter-javascript = "=0.25.0"
 build = ["tree-sitter-javascript"]
 
 [dev-dependencies]
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
diff --git a/tree-sitter-preproc/Cargo.lock b/tree-sitter-preproc/Cargo.lock
index 67b67deda..24853a9b5 100644
--- a/tree-sitter-preproc/Cargo.lock
+++ b/tree-sitter-preproc/Cargo.lock
@@ -185,9 +185,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/tree-sitter-preproc/Cargo.toml b/tree-sitter-preproc/Cargo.toml
index ad97fa70e..968ceaca2 100644
--- a/tree-sitter-preproc/Cargo.toml
+++ b/tree-sitter-preproc/Cargo.toml
@@ -56,4 +56,4 @@ tree-sitter-language="0.1.0"
 cc = "^1.2"
 
 [dev-dependencies]
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
diff --git a/tree-sitter-tcl/Cargo.lock b/tree-sitter-tcl/Cargo.lock
index 2c78a2bff..13f5a473b 100644
--- a/tree-sitter-tcl/Cargo.lock
+++ b/tree-sitter-tcl/Cargo.lock
@@ -185,9 +185,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter"
-version = "0.26.11"
+version = "0.26.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1c71c1c4cc0920b20d6b0f6572e7682cd07a6a2faec71067a31fa394c586df"
+checksum = "83c567a8e18ae93f20982c90370b16fd24023aeaf52f6052b96957ab253a0fec"
 dependencies = [
  "cc",
  "regex",
diff --git a/tree-sitter-tcl/Cargo.toml b/tree-sitter-tcl/Cargo.toml
index 0d1fd8fc1..f616b7597 100644
--- a/tree-sitter-tcl/Cargo.toml
+++ b/tree-sitter-tcl/Cargo.toml
@@ -67,4 +67,4 @@ tree-sitter-language = "0.1.0"
 cc = "^1.2"
 
 [dev-dependencies]
-tree-sitter = "=0.26.11"
+tree-sitter = "=0.26.12"
diff --git a/utils/check-excluded-manifests.py b/utils/check-excluded-manifests.py
index 2cd8368eb..b0aab4f39 100644
--- a/utils/check-excluded-manifests.py
+++ b/utils/check-excluded-manifests.py
@@ -127,7 +127,7 @@
 # is about unification pressure, and the runtime has none: the lockfile
 # shows 25 crates depending on `tree-sitter-language` but only one
 # external crate (`tree-sitter-perl`) depending on `tree-sitter`, and
-# every manifest here already pins it at `=0.26.11` with the workspace
+# every manifest here already pins it at `=0.26.12` with the workspace
 # resolving. The runtime's ABI version is also what a grammar's
 # generated `parser.c` is built against, so an accidental bump is
 # exactly the drift this gate exists to catch.