diff --git a/.gitignore b/.gitignore
index b83d2226..ca98cd96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /target/
+Cargo.lock
diff --git a/serde2/.gitignore b/serde2/.gitignore
index b83d2226..ca98cd96 100644
--- a/serde2/.gitignore
+++ b/serde2/.gitignore
@@ -1 +1,2 @@
 /target/
+Cargo.lock