diff --git a/build/pkgs/traitlets/checksums.ini b/build/pkgs/traitlets/checksums.ini
index 415ba07704b..dd2af5d21ac 100644
--- a/build/pkgs/traitlets/checksums.ini
+++ b/build/pkgs/traitlets/checksums.ini
@@ -1,5 +1,5 @@
 tarball=traitlets-VERSION.tar.gz
-sha1=08d9b2db5b0cf7794e9c4ca76f7981cccc3233b6
-md5=19483ec0685e837912cff128209aa845
-cksum=3463913536
+sha1=86d03557843700d6dd0657371d15f0520c2f392f
+md5=31f7fd84518fe08cb40ab18f6dde0d54
+cksum=1147319509
 upstream_url=https://pypi.io/packages/source/t/traitlets/traitlets-VERSION.tar.gz
diff --git a/build/pkgs/traitlets/package-version.txt b/build/pkgs/traitlets/package-version.txt
index 831446cbd27..ac14c3dfaa8 100644
--- a/build/pkgs/traitlets/package-version.txt
+++ b/build/pkgs/traitlets/package-version.txt
@@ -1 +1 @@
-5.1.0
+5.1.1