diff --git a/RELEASE b/RELEASE
index cd45bdbf0b..2d77e41183 100644
--- a/RELEASE
+++ b/RELEASE
@@ -1,4 +1,4 @@
-tag: v0.45.3
+tag: v0.45.4
 
 releaseNoteGenerator:
   showCommitter: false
diff --git a/docs/content/en/docs-v0.45.x/user-guide/configuration-reference.md b/docs/content/en/docs-v0.45.x/user-guide/configuration-reference.md
index bd815274ac..436c7ecbc1 100644
--- a/docs/content/en/docs-v0.45.x/user-guide/configuration-reference.md
+++ b/docs/content/en/docs-v0.45.x/user-guide/configuration-reference.md
@@ -206,7 +206,7 @@ One of `yamlField` or `regex` is required.
 |-|-|-|-|
 | file | string | The relative path from the repository root to the file to be updated. | Yes |
 | yamlField | string | The yaml path to the field to be updated. It requires to start with `$` which represents the root element. e.g. `$.foo.bar[0].baz`. | No |
-| regex | string | The regex string that specify what should be replaced. The only first capturing group enclosed by `()` will be replaced with the new value. e.g. `host.xz/foo/bar:(v[0-9]+.[0-9]+.[0-9]+)` | No |
+| regex | string | The regex string that specify what should be replaced. The only first capturing group enclosed by `()` will be replaced with the new value. e.g. `host.xz/foo/bar:(v[0-9].[0-9].[0-9])` | No |
 
 ## CommitMatcher
 
diff --git a/docs/content/en/docs-v0.45.x/user-guide/managing-application/defining-app-configuration/lambda.md b/docs/content/en/docs-v0.45.x/user-guide/managing-application/defining-app-configuration/lambda.md
index c58fe6fbff..d6bf0a15e8 100644
--- a/docs/content/en/docs-v0.45.x/user-guide/managing-application/defining-app-configuration/lambda.md
+++ b/docs/content/en/docs-v0.45.x/user-guide/managing-application/defining-app-configuration/lambda.md
@@ -34,6 +34,10 @@ spec:
     app: simple
   environments:
     FOO: bar
+  # ephemeralStorage is optional value. If you define a ephemeral storage to lambda, you can
+  # use this field. The value must be in between 512 to 10240 MB.
+  ephemeralStorage:
+    size: 512
   # vpcConfig is optional value. If you define a vpc configuration to lambda, you can
   # use this field.
   vpcConfig:
diff --git a/docs/content/en/docs-v0.45.x/user-guide/managing-piped/configuration-reference.md b/docs/content/en/docs-v0.45.x/user-guide/managing-piped/configuration-reference.md
index e0308533b0..2a1055d482 100644
--- a/docs/content/en/docs-v0.45.x/user-guide/managing-piped/configuration-reference.md
+++ b/docs/content/en/docs-v0.45.x/user-guide/managing-piped/configuration-reference.md
@@ -89,7 +89,7 @@ This field is deprecated, please use [PlatformProvider](#platformprovider) inste
 | Field | Type | Description | Required |
 |-|-|-|-|
 | name | string | The name of the platform provider. | Yes |
-| type | string | The platform provider type. Must be one of the following values:<br>`KUBERNETES`, `TERRAFORM`, `CLOUDRUN`, `LAMBDA`. | Yes |
+| type | string | The platform provider type. Must be one of the following values:<br>`KUBERNETES`, `TERRAFORM`, `ECS`, `CLOUDRUN`, `LAMBDA`. | Yes |
 | config | [PlatformProviderConfig](#platformproviderconfig) | Specific configuration for the specified type of platform provider. | No |
 
 ## PlatformProviderConfig
diff --git a/docs/content/en/docs-v0.45.x/user-guide/terraform-provider-pipecd.md b/docs/content/en/docs-v0.45.x/user-guide/terraform-provider-pipecd.md
index 8f1963e80a..5175deb0c7 100644
--- a/docs/content/en/docs-v0.45.x/user-guide/terraform-provider-pipecd.md
+++ b/docs/content/en/docs-v0.45.x/user-guide/terraform-provider-pipecd.md
@@ -32,7 +32,7 @@ provider "pipecd" {
 ```
 
 ### Manage Piped agent
-Add `pipecd_piped` resource to manage a Piped aegnt.
+Add `pipecd_piped` resource to manage a Piped agent.
 
 ```hcl
 resource "pipecd_piped" "mypiped" {