diff --git a/clients/nodejs/sliderule/package.json b/clients/nodejs/sliderule/package.json
index 8f272226..a969b982 100644
--- a/clients/nodejs/sliderule/package.json
+++ b/clients/nodejs/sliderule/package.json
@@ -2,7 +2,7 @@
   "name": "@sliderule/sliderule",
   "type": "module",
   "description": "client for the SlideRule on-demand science data processing service",
-  "version": "4.9.0",
+  "version": "4.9.1",
   "keywords": [
     "sliderule"
   ],
diff --git a/clients/python/version.txt b/clients/python/version.txt
index 7bd7ebe2..1dff3233 100644
--- a/clients/python/version.txt
+++ b/clients/python/version.txt
@@ -1 +1 @@
-v4.9.0
+v4.9.1
diff --git a/version.txt b/version.txt
index 7bd7ebe2..1dff3233 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-v4.9.0
+v4.9.1