diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fbe8245..93dc2c4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-11, windows-latest]
+        os: [ubuntu-latest, macos-13, windows-latest]
     steps:
     - uses: actions/checkout@v3
     - name: Rust Format
@@ -33,7 +33,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-11, windows-latest]
+        os: [ubuntu-latest, macos-13, windows-latest]
     steps:
     - uses: actions/checkout@v3
     - name: Install Rust toolchain
diff --git a/crates/oq3_semantics/Cargo.toml b/crates/oq3_semantics/Cargo.toml
index 51253c8..948b129 100644
--- a/crates/oq3_semantics/Cargo.toml
+++ b/crates/oq3_semantics/Cargo.toml
@@ -18,7 +18,7 @@ doctest = false
 oq3_source_file.workspace = true
 oq3_syntax.workspace = true
 hashbrown = { version = "0.12.3" }
-rowan = "0.15.11"
+rowan = {version = "<=0.15.15"}
 boolenum = "0.1"
 
 [dev-dependencies]
diff --git a/crates/oq3_syntax/Cargo.toml b/crates/oq3_syntax/Cargo.toml
index 2e49883..d8db5d9 100644
--- a/crates/oq3_syntax/Cargo.toml
+++ b/crates/oq3_syntax/Cargo.toml
@@ -21,10 +21,9 @@ either = "1.7.0"
 indexmap = "2.0.0"
 itertools = "0.10.5"
 once_cell = "1.17.0"
-rowan = "0.15.11"
+rowan = {version = "<=0.15.15"}
 rustc-hash = "1.1.0"
 smol_str = "0.2.0"
-stdx = { version = "0.0.188", package = "ra_ap_stdx"}
 triomphe = { version = "<= 0.1.11", default-features = false, features = ["std"] }
 xshell = "0.2.2"
 rustversion = "1.0"
diff --git a/crates/oq3_syntax/src/lib.rs b/crates/oq3_syntax/src/lib.rs
index e58905c..1e662e7 100644
--- a/crates/oq3_syntax/src/lib.rs
+++ b/crates/oq3_syntax/src/lib.rs
@@ -28,11 +28,6 @@
     semicolon_in_expressions_from_macros
 )]
 
-#[allow(unused)]
-macro_rules! eprintln {
-    ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
-}
-
 mod parsing;
 mod ptr;
 mod sourcegen;
@@ -48,7 +43,6 @@ pub mod ted;
 
 use std::marker::PhantomData;
 
-use stdx::format_to;
 use triomphe::Arc;
 
 pub use crate::{
@@ -452,3 +446,20 @@ fn api_walkthrough() {
     }
     assert_eq!(exprs_cast, exprs_visit);
 }
+
+// #229
+// This macro is copied from ra_ap_stdx. It is the only feature
+// we needed from ra_ap_stdx. But that crate put us in a version bind.
+/// Appends formatted string to a `String`.
+#[macro_export]
+macro_rules! format_to {
+    ($buf:expr) => ();
+    ($buf:expr, $lit:literal $($arg:tt)*) => {
+        {
+            use ::std::fmt::Write as _;
+            // We can't do ::std::fmt::Write::write_fmt($buf, format_args!($lit $($arg)*))
+            // unfortunately, as that loses out on autoref behavior.
+            _ = $buf.write_fmt(format_args!($lit $($arg)*))
+        }
+    };
+}
diff --git a/crates/oq3_syntax/src/tests.rs b/crates/oq3_syntax/src/tests.rs
index 25ecdb4..b7fcfe1 100644
--- a/crates/oq3_syntax/src/tests.rs
+++ b/crates/oq3_syntax/src/tests.rs
@@ -1,9 +1,7 @@
 // Copyright contributors to the openqasm-parser project
 // SPDX-License-Identifier: Apache-2.0
 
-#[cfg(not(feature = "in-rust-tree"))]
 mod ast_src;
-#[cfg(not(feature = "in-rust-tree"))]
 mod sourcegen_ast;
 
 use crate::ast;