diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0b4ba881df5..9a31064c48a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -109,7 +109,7 @@ jobs:
   compatibility-test:
     strategy:
       matrix:
-        go-version: [1.19, 1.18]
+        go-version: ["1.20", 1.19, 1.18]
         os: [ubuntu-latest, macos-latest, windows-latest]
         # GitHub Actions does not support arm* architectures on default
         # runners. It is possible to acomplish this with a self-hosted runner
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33609fb5106..1c7d222f487 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Added
+
+- Support [Go 1.20]. (#3693)
+
 ## [1.13.0/0.36.0] 2023-02-07
 
 ### Added
@@ -2303,3 +2307,5 @@ It contains api and sdk for trace and meter.
 [0.1.2]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.1.2
 [0.1.1]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.1.1
 [0.1.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.1.0
+
+[Go 1.20]: https://go.dev/doc/go1.20
diff --git a/README.md b/README.md
index 1b2ee21fbf5..878d87e58b9 100644
--- a/README.md
+++ b/README.md
@@ -50,14 +50,19 @@ Currently, this project supports the following environments.
 
 | OS      | Go Version | Architecture |
 | ------- | ---------- | ------------ |
+| Ubuntu  | 1.20       | amd64        |
 | Ubuntu  | 1.19       | amd64        |
 | Ubuntu  | 1.18       | amd64        |
+| Ubuntu  | 1.20       | 386          |
 | Ubuntu  | 1.19       | 386          |
 | Ubuntu  | 1.18       | 386          |
+| MacOS   | 1.20       | amd64        |
 | MacOS   | 1.19       | amd64        |
 | MacOS   | 1.18       | amd64        |
+| Windows | 1.20       | amd64        |
 | Windows | 1.19       | amd64        |
 | Windows | 1.18       | amd64        |
+| Windows | 1.20       | 386          |
 | Windows | 1.19       | 386          |
 | Windows | 1.18       | 386          |