diff --git a/README.md b/README.md
index ec9bb34..df2aa36 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ A GitHub Action for installing the [helm/chart-testing](https://github.com/helm/
 
 For more information on inputs, see the [API Documentation](https://developer.github.com/v3/repos/releases/#input)
 
-- `version`: The chart-testing version to install (default: `v3.3.0`)
+- `version`: The chart-testing version to install (default: `v3.4.0`)
 
 ### Example Workflow
 
diff --git a/action.yml b/action.yml
index ffbd450..1eeb5c4 100644
--- a/action.yml
+++ b/action.yml
@@ -6,8 +6,8 @@ branding:
   icon: anchor
 inputs:
   version:
-    description: "The chart-testing version to install (default: v3.3.0)"
-    default: v3.3.0
+    description: "The chart-testing version to install (default: v3.4.0)"
+    default: v3.4.0
 runs:
   using: composite
   steps:
diff --git a/ct.sh b/ct.sh
index b8d702e..9befd3a 100755
--- a/ct.sh
+++ b/ct.sh
@@ -4,7 +4,7 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-DEFAULT_CHART_TESTING_VERSION=v3.3.0
+DEFAULT_CHART_TESTING_VERSION=v3.4.0
 
 show_help() {
 cat << EOF