diff --git a/analysis_options.yaml b/analysis_options.yaml
index a5744c1..ba46287 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -2,3 +2,7 @@ include: package:flutter_lints/flutter.yaml
 
 # Additional information about this file can be found at
 # https://dart.dev/guides/language/analysis-options
+
+linter:
+  rules:
+    - avoid_dynamic_calls
\ No newline at end of file
diff --git a/lib/src/persister/disk_volt_persister.dart b/lib/src/persister/disk_volt_persister.dart
index d70f28a..abb1c21 100644
--- a/lib/src/persister/disk_volt_persister.dart
+++ b/lib/src/persister/disk_volt_persister.dart
@@ -187,10 +187,10 @@ class FileVoltPersistor implements VoltPersistor {
             .first);
 
         final metadataString = await metadataFile.readAsString();
-        final jsonMetadata = jsonDecode(metadataString);
+        final jsonMetadata = jsonDecode(metadataString) as Map<String, Object?>;
 
         final T data = deserialiser(dynamicData);
-        final timestamp = DateTime.parse(jsonMetadata['timestamp']);
+        final timestamp = DateTime.parse(jsonMetadata['timestamp'] as String);
         final hasData = HasData<T>(data, timestamp, scope);
 
         cache[relativePath] = hasData;