diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8950b44..ba8e016 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## [v0.1.0](https://github.com/allenai/beaker-py/releases/tag/v0.1.0) - 2021-11-19
+
 ### Added
 
 - Added `Beaker` client class.
diff --git a/scripts/prepare_changelog.py b/scripts/prepare_changelog.py
index b7d25c5..073e9cc 100644
--- a/scripts/prepare_changelog.py
+++ b/scripts/prepare_changelog.py
@@ -10,7 +10,7 @@ def main():
     with changelog.open() as f:
         lines = f.readlines()
 
-    insert_index: int
+    insert_index: int = -1
     for i in range(len(lines)):
         line = lines[i]
         if line.startswith("## Unreleased"):
@@ -20,7 +20,8 @@ def main():
             return
         elif line.startswith("## [v"):
             break
-    else:
+
+    if insert_index < 0:
         raise RuntimeError("Couldn't find 'Unreleased' section")
 
     lines.insert(insert_index, "\n")