diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b6a303..f0a9451 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+0.4.1 (2020-04-30)
+==================
+
+* [Enhancement] [#37](https://github.com/civitaspo/embulk-output-s3_parquet/pull/37) Rewrite the integration tests to make writing and reading tests easier & Use Diagrams for all test cases.
+* [Enhancement] [#38](https://github.com/civitaspo/embulk-output-s3_parquet/pull/38) Make all column types enable to use LogicalTypeHandler.
+* [Enhancement] [#38](https://github.com/civitaspo/embulk-output-s3_parquet/pull/38) Make parquet schema testable.
+* [New Feature] [#38](https://github.com/civitaspo/embulk-output-s3_parquet/pull/38) Support timestamp-nanos.
+
 0.4.0 (2020-04-28)
 ==================
 
diff --git a/README.md b/README.md
index 5a76a54..47e8cef 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@
 - **column_options**: a map whose keys are name of columns, and values are configuration with following parameters (optional)
   - **timezone**: timezone if type of this column is timestamp. If not set, **default_timezone** is used. (string, optional)
   - **format**: timestamp format if type of this column is timestamp. If not set, **default_timestamp_format**: is used. (string, optional)
-  - **logical_type**: a Parquet logical type name (`timestamp-millis`, `timestamp-micros`, `json`, `int8`, `int16`, `int32`, `int64`, `uint8`, `uint16`, `uint32`, `uint64`) (string, optional)
+  - **logical_type**: a Parquet logical type name (`timestamp-millis`, `timestamp-micros`, `timestamp-nanos`, `json`, `int8`, `int16`, `int32`, `int64`, `uint8`, `uint16`, `uint32`, `uint64`) (string, optional)
 - **canned_acl**: grants one of [canned ACLs](https://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#CannedACL) for created objects (string, default: `private`)
 - **block_size**: The block size is the size of a row group being buffered in memory. This limits the memory usage when writing. Larger values will improve the I/O when reading but consume more memory when writing. (int, default: `134217728` (128MB))
 - **page_size**: The page size is for compression. When reading, each page can be decompressed independently. A block is composed of pages. The page is the smallest unit that must be read fully to access a single record. If this value is too small, the compression will deteriorate. (int, default: `1048576` (1MB))
@@ -84,6 +84,7 @@
       |:---|:---|:---|
       |timestamp-millis|timestamp||
       |timestamp-micros|long|Glue cannot recognize timestamp-micros.|
+      |timestamp-nanos|long|Glue cannot recognize timestamp-nanos.|
       |int8|tinyint||
       |int16|smallint||
       |int32|int||
@@ -105,7 +106,7 @@
   - **password** proxy password (string, optional)
 - **buffer_dir**: buffer directory for parquet files to be uploaded on S3 (string, default: Create a Temporary Directory)
 - **type_options**:  a map whose keys are name of embulk type(`boolean`, `long`, `double`, `string`, `timestamp`, `json`), and values are configuration with following parameters (optional)
-  - **logical_type**: a Parquet logical type name (`timestamp-millis`, `timestamp-micros`, `json`, `int8`, `int16`, `int32`, `int64`, `uint8`, `uint16`, `uint32`, `uint64`) (string, optional)
+  - **logical_type**: a Parquet logical type name (`timestamp-millis`, `timestamp-micros`, `timestamp-nanos`, `json`, `int8`, `int16`, `int32`, `int64`, `uint8`, `uint16`, `uint32`, `uint64`) (string, optional)
 
 
 ## Example
diff --git a/build.gradle b/build.gradle
index 024c3e4..d97c049 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,7 +11,7 @@ repositories {
 }
 
 group = "pro.civitaspo"
-version = "0.4.0"
+version = "0.4.1"
 description = "Dumps records to S3 Parquet."
 
 sourceCompatibility = 1.8