diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b0fcda..c5e5ef2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.0.1] - 2025-09-10
+
+### Bug Fixes
+
+- Convert dtypes during joining using lydata's `cast_dtypes()`.
+
 ## [1.0.0] - 2025-09-04
 
 ### Bug Fixes
@@ -909,6 +915,7 @@ returns `None` instead. Fixes [#11]
 ## [0.5.3] - 2022-08-22
 
 <!-- markdownlint-disable-file MD024 -->
+[1.0.1]: https://github.com/lycosystem/lyscripts/compare/1.0.0...1.0.1
 [1.0.0]: https://github.com/lycosystem/lyscripts/compare/1.0.0rc3...1.0.0
 [1.0.0rc3]: https://github.com/lycosystem/lyscripts/compare/1.0.0rc2...1.0.0rc3
 [1.0.0rc2]: https://github.com/lycosystem/lyscripts/compare/1.0.0rc1...1.0.0rc2
diff --git a/src/lyscripts/data/join.py b/src/lyscripts/data/join.py
index d7eb62e..8b0547e 100644
--- a/src/lyscripts/data/join.py
+++ b/src/lyscripts/data/join.py
@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pandas as pd
+from lydata.validator import cast_dtypes
 from pydantic import Field
 
 from lyscripts.cli import assemble_main
@@ -61,6 +62,9 @@ def cli_cmd(self) -> None:
 
         for data_config in self.inputs:
             data = data_config.load()
+            # `cast_dtypes()` ensures that e.g. boolean values are not suddenly
+            # converted to strings when a dataset with missing values is concatenated.
+            data = cast_dtypes(data)
             if joined is None:
                 joined = data
             else: