diff --git a/pyproject.toml b/pyproject.toml
index 58b94c9..6a140b1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 name = "feedsummarizer"
 version = "0.1.0"
 # Pinned to 3.13 so we stay in line with AWS' Lambda runtime
-requires-python = "3.13"
+requires-python = "==3.13"
 dependencies = []
 
 [dependency-groups]