diff --git a/src/benchmark_lfe.py b/src/benchmark_lfe.py
index bd3fa31..7379de8 100644
--- a/src/benchmark_lfe.py
+++ b/src/benchmark_lfe.py
@@ -37,6 +37,9 @@ def time_lfe(self, _, regex_name):
             for i in range(len(regex_sample_tokens)):
                 _ = token_enforcer.get_allowed_tokens(regex_sample_tokens[: i + 1])
 
+    def teardown(self, *args):
+        del self.tokenizer_data
+
 
 class LMFormatEnforcerJsonSchema:
     params = [models, json_cases.keys()]
@@ -66,3 +69,6 @@ def time_lfe(self, _, json_schema_name):
             json_sample_tokens = self.tokenizer.encode(json_sample)
             for i in range(len(json_sample_tokens)):
                 _ = token_enforcer.get_allowed_tokens(json_sample_tokens[: i + 1])
+
+    def teardown(self, *args):
+        del self.tokenizer_data
diff --git a/src/data.py b/src/data.py
index 3c5144a..2159be1 100644
--- a/src/data.py
+++ b/src/data.py
@@ -57,8 +57,8 @@
             "title": "Character",
             "type": "object",
         },
-        "samples": map(
-            json.dumps, json.load(open(SAMPLES_PATH / "rpg_characters.json"))
+        "samples": list(
+            map(json.dumps, json.load(open(SAMPLES_PATH / "rpg_characters.json")))
         ),
     },
     "Simple nested schema": {
@@ -94,8 +94,8 @@
             },
             "required": ["id", "work", "recording_artists"],
         },
-        "samples": map(
-            json.dumps, json.load(open(SAMPLES_PATH / "recording_schema.json"))
+        "samples": list(
+            map(json.dumps, json.load(open(SAMPLES_PATH / "recording_schema.json")))
         ),
     },
 }