diff --git a/Cargo.lock b/Cargo.lock
index 00b5d6d..fcb6a88 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -117,16 +117,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "ctor"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd4056f63fce3b82d852c3da92b08ea59959890813a7f4ce9c0ff85b10cf301b"
-dependencies = [
- "quote",
- "syn 2.0.12",
-]
-
 [[package]]
 name = "env_logger"
 version = "0.8.4"
@@ -274,7 +264,6 @@ version = "1.0.0"
 dependencies = [
  "base64 0.21.0",
  "const-str",
- "ctor",
  "heapless",
  "impls",
  "libc",
@@ -436,7 +425,7 @@ checksum = "b22a693222d716a9587786f37ac3f6b4faedb5b80c23914e7303ff5a1d8016e9"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -636,17 +625,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "syn"
-version = "2.0.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79d9531f94112cfc3e4c8f5f02cb2b58f72c97b7efd85f70203cc6d8efda5927"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "tempfile"
 version = "3.4.0"
@@ -724,7 +702,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -746,7 +724,7 @@ checksum = "2aff81306fcac3c7515ad4e177f521b5c9a15f2b08f4e32d823066102f35a5f6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index ae73a3d..6ae3a40 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,8 +20,6 @@ base64 = "0.21.0"
 once_cell = "1.17.1"
 
 [dev-dependencies]
-# Simplifies test setup and the `waitid` hack.
-ctor = "0.2.0"
 quickcheck = "1.0.3"
 quickcheck_macros = "1.0.0"
 tempfile = "3.4.0"
diff --git a/src/parent/ipc/test_utils.rs b/src/parent/ipc/test_utils.rs
index c477c64..45367d0 100644
--- a/src/parent/ipc/test_utils.rs
+++ b/src/parent/ipc/test_utils.rs
@@ -74,6 +74,7 @@ impl StaticState {
     }
 
     pub fn init_test_state_with_key_dir(&'static self, key_dir: std::path::PathBuf) {
+        init_logger();
         self.state.init_dynamic(ParentIpcDynamic {
             port: std::num::NonZeroU16::new(1).unwrap(),
             child_user_group: UserGroup {
diff --git a/src/state/byte_count_map.rs b/src/state/byte_count_map.rs
index 74a8e47..3e41c42 100644
--- a/src/state/byte_count_map.rs
+++ b/src/state/byte_count_map.rs
@@ -296,6 +296,7 @@ mod tests {
 
     #[test]
     fn works_on_one_thread() {
+        init_logger();
         static S: PromState = PromState::new();
 
         S.add_message_line_ingested(&map_key(b"one"), 123);
@@ -372,6 +373,7 @@ mod tests {
 
     #[test]
     fn works_on_two_contending_threads() {
+        init_logger();
         // Pre-allocate everything so it won't take a long time to run with all the allocations.
         // This is one of the slowest tests in Miri, so it's particularly helpful here.
         static S: PromState = PromState::new();
@@ -468,6 +470,7 @@ mod tests {
     // Extremely slow in Miri (might very well take over an hour). Just skip it.
     #[cfg_attr(miri, ignore)]
     fn works_on_a_hundred_contending_threads() {
+        init_logger();
         // Pre-allocate everything so it won't take a long time to run with all the allocations.
         static S: PromState = PromState::new();
 
diff --git a/src/test_utils/spy/logger_spy.rs b/src/test_utils/spy/logger_spy.rs
index f9a0f10..294fc2f 100644
--- a/src/test_utils/spy/logger_spy.rs
+++ b/src/test_utils/spy/logger_spy.rs
@@ -162,21 +162,23 @@ impl std::ops::Deref for LoggerCaptureGuard {
     }
 }
 
-// Initialize this for all tests. Easier than trying to pump it through literally everything, and
-// I can also use this to track down any/all stray logs.
-#[ctor::ctor]
-fn init_logger() {
-    // Don't log `trace!(...)` stuff.
-    if std::env::var("RUST_TRACE") == Ok("1".into()) {
-        log::set_max_level(log::LevelFilter::Trace);
-    } else {
-        log::set_max_level(log::LevelFilter::Debug);
-    }
-    log::set_logger(&TEST_LOGGER).unwrap();
+pub fn init_logger() {
+    static ONCE: std::sync::Once = std::sync::Once::new();
+    ONCE.call_once(|| {
+        // Don't log `trace!(...)` stuff.
+        let level = if std::env::var("RUST_TRACE") == Ok("1".into()) {
+            log::LevelFilter::Trace
+        } else {
+            log::LevelFilter::Debug
+        };
+        log::set_max_level(level);
+        log::set_logger(&TEST_LOGGER).unwrap();
+    });
 }
 
 #[must_use = "The returned guard must be live for the whole test to ensure all logs are captured."]
 pub fn setup_capture_logger() -> LoggerCaptureGuard {
+    init_logger();
     LoggerCaptureGuard(LoggerGuard::new(LoggerKind::LoggerVec(LogCapture {
         inner: Mutex::new(Vec::new()),
     })))