diff --git a/packages/ripple-keypairs/.gitignore b/packages/ripple-keypairs/.gitignore
index b2724bce..429bb033 100644
--- a/packages/ripple-keypairs/.gitignore
+++ b/packages/ripple-keypairs/.gitignore
@@ -1,5 +1,9 @@
 # .gitignore
 
+# Ignore package locks other than Yarn.
+package-lock.json
+npm-shrinkwrap.json
+
 # Ignore vim swap files.
 *.swp
 
@@ -63,3 +67,6 @@ scripts/cache
 eslintrc
 
 distrib/
+
+# nyc (istanbul)
+.nyc_output