diff --git a/practices/doc-comments/Cargo.lock b/practices/doc-comments/Cargo.lock
deleted file mode 100644
index 9477981..0000000
--- a/practices/doc-comments/Cargo.lock
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "doc-comments"
-version = "0.1.0"
diff --git a/practices/hello-package/.gitignore b/practices/hello-package/.gitignore
index ea8c4bf..96ef6c0 100644
--- a/practices/hello-package/.gitignore
+++ b/practices/hello-package/.gitignore
@@ -1 +1,2 @@
 /target
+Cargo.lock
diff --git a/practices/hello-package/Cargo.lock b/practices/hello-package/Cargo.lock
deleted file mode 100644
index dbd6e7c..0000000
--- a/practices/hello-package/Cargo.lock
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "hello-package"
-version = "0.1.0"