diff --git a/pipelines/forecast_state.py b/pipelines/forecast_state.py
index c5113117..e5fb1f04 100644
--- a/pipelines/forecast_state.py
+++ b/pipelines/forecast_state.py
@@ -3,12 +3,13 @@
 import os
 import shutil
 import subprocess
+import tomllib
+import tomli_w
 from datetime import datetime, timedelta
 from pathlib import Path
 
 import numpyro
 import polars as pl
-import yaml
 from prep_data import process_and_save_state
 from pygit2 import Repository
 from save_eval_data import save_eval_data
@@ -20,11 +21,11 @@
 
 
 def record_git_info(model_run_dir: Path):
-    metadata_file = Path(model_run_dir, "metadata.yaml")
+    metadata_file = Path(model_run_dir, "metadata.toml")
 
     if metadata_file.exists():
-        with open(metadata_file, "r") as file:
-            metadata = yaml.safe_load(file)
+        with open(metadata_file, "rb") as file:
+            metadata = tomllib.load(file)
     else:
         metadata = {}
 
@@ -43,17 +44,18 @@ def record_git_info(model_run_dir: Path):
 
     metadata.update(new_metadata)
 
-    with open(metadata_file, "w") as file:
-        yaml.dump(metadata, file)
+    metadata_file.parent.mkdir(parents=True, exist_ok=True)
+    with open(metadata_file, "wb") as file:
+        tomli_w.dump(metadata, file)
 
 
 def copy_and_record_priors(priors_path: Path, model_run_dir: Path):
-    metadata_file = Path(model_run_dir, "metadata.yaml")
+    metadata_file = Path(model_run_dir, "metadata.toml")
     shutil.copyfile(priors_path, Path(model_run_dir, "priors.py"))
 
     if metadata_file.exists():
-        with open(metadata_file, "r") as file:
-            metadata = yaml.safe_load(file)
+        with open(metadata_file, "rb") as file:
+            metadata = tomllib.load(file)
     else:
         metadata = {}
 
@@ -63,8 +65,8 @@ def copy_and_record_priors(priors_path: Path, model_run_dir: Path):
 
     metadata.update(new_metadata)
 
-    with open(metadata_file, "w") as file:
-        yaml.dump(metadata, file)
+    with open(metadata_file, "wb") as file:
+        tomli_w.dump(metadata, file)
 
 
 def generate_epiweekly(model_run_dir: Path) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index e37307d1..e561d840 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ pyarrow = "^18.0.0"
 pygit2 = "^1.16.0"
 azuretools = {git = "https://github.com/cdcgov/cfa-azuretools"}
 forecasttools = {git = "https://github.com/CDCgov/forecasttools-py"}
+tomli-w = "^1.1.0"
 
 [tool.poetry.group.test]
 optional = true