diff --git a/examples/basic_example.py b/examples/basic_example.py
index aa781bd5..f1b9bc6b 100644
--- a/examples/basic_example.py
+++ b/examples/basic_example.py
@@ -25,4 +25,4 @@
 mf_out = MetaFrame.load_json(gmf_path)
 
 # create a fake dataset
-df_syn = mf_out.synthesize(10)
+df_syn = mf_out.synthesize(10, seed=1234)
diff --git a/examples/gmf_files/example_gmf_simple.json b/examples/gmf_files/example_gmf_simple.json
index b7cf5001..66dfa9ce 100644
--- a/examples/gmf_files/example_gmf_simple.json
+++ b/examples/gmf_files/example_gmf_simple.json
@@ -4,9 +4,9 @@
     "provenance": {
         "created by": {
             "name": "metasyn",
-            "version": "1.0.2.dev34+gd68929e"
+            "version": "1.1.0"
         },
-        "creation time": "2024-10-01T09:57:15.595769"
+        "creation time": "2024-12-18T14:54:05.300334"
     },
     "vars": [
         {
diff --git a/metasyn/metaframe.py b/metasyn/metaframe.py
index 14712009..3cfe9890 100644
--- a/metasyn/metaframe.py
+++ b/metasyn/metaframe.py
@@ -449,7 +449,7 @@ def load_toml(cls, fp: Union[pathlib.Path, str],
         meta_vars = [MetaVar.from_dict(d) for d in self_dict["vars"]]
         return cls(meta_vars, n_rows)
 
-    def synthesize(self, n: Optional[int] = None) -> pl.DataFrame:
+    def synthesize(self, n: Optional[int] = None, seed: Optional[int] = None) -> pl.DataFrame:
         """Create a synthetic Polars dataframe.
 
         Parameters
@@ -467,7 +467,7 @@ def synthesize(self, n: Optional[int] = None) -> pl.DataFrame:
                 raise ValueError("Cannot synthesize DataFrame, since number of rows is unknown."
                                  "Please specify the number of rows to synthesize.")
             n = self.n_rows
-        synth_dict = {var.name: var.draw_series(n) for var in self.meta_vars}
+        synth_dict = {var.name: var.draw_series(n, seed=seed) for var in self.meta_vars}
         return pl.DataFrame(synth_dict)
 
     def __repr__(self) -> str:
diff --git a/metasyn/var.py b/metasyn/var.py
index 645231c6..fd71e721 100644
--- a/metasyn/var.py
+++ b/metasyn/var.py
@@ -232,7 +232,7 @@ def draw(self) -> Any:
             return None
         return self.distribution.draw()
 
-    def draw_series(self, n: int) -> pl.Series:
+    def draw_series(self, n: int, seed: Optional[int]) -> pl.Series:
         """Draw a new synthetic series from the metadata.
 
         Parameters
@@ -245,6 +245,8 @@ def draw_series(self, n: int) -> pl.Series:
         polars.Series:
             Polars series with the synthetic data.
         """
+        if seed is not None:
+            np.random.seed(seed)
         self.distribution.draw_reset()
         value_list = [self.draw() for _ in range(n)]
         pl_type = self.dtype.split("(")[0]