diff --git a/docs/provider/versions.md b/docs/provider/versions.md
new file mode 100644
index 0000000..a8b9f94
--- /dev/null
+++ b/docs/provider/versions.md
@@ -0,0 +1,65 @@
+# API doc
+
+This is API documentation for Provider versions. This is generated by `httpdoc`. Don't edit by hand.
+
+## Table of contents
+
+- [[200] GET /v1/providers/cappyzawa/concourse/versions](#200-get-v1providerscappyzawaconcourseversions)
+- [[404] GET /v1/providers/foo/bar/versions](#404-get-v1providersfoobarversions)
+
+
+## [200] GET /v1/providers/cappyzawa/concourse/versions
+
+existing provider: cappyzawa/concourse
+
+### Request
+
+
+
+
+
+
+
+
+
+### Response
+
+
+
+
+
+Response example
+
+<details>
+<summary>Click to expand code.</summary>
+
+```javascript
+{"versions":[{"version":"0.1.0","protocols":["5.3"],"platforms":[{"os":"darwin","arch":"amd64"},{"os":"linux","arch":"amd64"}]},{"version":"0.0.5","protocols":["5.3"],"platforms":[{"os":"darwin","arch":"amd64"},{"os":"linux","arch":"amd64"}]}]}
+
+```
+
+</details>
+
+
+## [404] GET /v1/providers/foo/bar/versions
+
+non existing provider: foo/bar
+
+### Request
+
+
+
+
+
+
+
+
+
+### Response
+
+
+
+
+
+
+
diff --git a/go.mod b/go.mod
index 62a6284..ae54d03 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,6 @@ require (
 	github.com/go-chi/chi v4.1.2+incompatible
 	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/tenntenn/gpath v0.0.0-20170604083136-3e6e957a3952 // indirect
-	go.mercari.io/go-httpdoc v0.2.0 // indirect
+	go.mercari.io/go-httpdoc v0.2.0
 	gopkg.in/yaml.v2 v2.3.0
 )
diff --git a/handler/provider/versions_test.go b/handler/provider/versions_test.go
index 6fdbe74..0671a1f 100644
--- a/handler/provider/versions_test.go
+++ b/handler/provider/versions_test.go
@@ -1,9 +1,79 @@
 package provider_test
 
 import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
 	"testing"
+
+	"github.com/cappyzawa/terraform-registry/config"
+	"github.com/cappyzawa/terraform-registry/handler/provider"
+	"github.com/go-chi/chi"
+	"go.mercari.io/go-httpdoc"
 )
 
 func TestVersionHandlerServeHTTP(t *testing.T) {
 	t.Parallel()
+
+	cases := []struct {
+		name         string
+		namespace    string
+		_type        string
+		expectStatus int
+	}{
+		{
+			name:         "existing provider: cappyzawa/concourse",
+			namespace:    "cappyzawa",
+			_type:        "concourse",
+			expectStatus: http.StatusOK,
+		},
+		{
+			name:         "non existing provider: foo/bar",
+			namespace:    "foo",
+			_type:        "bar",
+			expectStatus: http.StatusNotFound,
+		},
+	}
+
+	document := &httpdoc.Document{
+		Name: "Provider versions",
+	}
+	defer func() {
+		if err := document.Generate("../../docs/provider/versions.md"); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	for _, test := range cases {
+		t.Run(test.name, func(t *testing.T) {
+			ts := testServer(document, test.name)
+			req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/v1/providers/%s/%s/versions", ts.URL, test.namespace, test._type), nil)
+			res, err := http.DefaultClient.Do(req)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			defer res.Body.Close()
+			if res.StatusCode != test.expectStatus {
+				t.Errorf("status code should be %v, but it is %v", test.expectStatus, res.StatusCode)
+			}
+		})
+	}
+}
+
+func testServer(doc *httpdoc.Document, description string) *httptest.Server {
+	cfg, _ := config.Parse("../../testdata/config.yaml")
+	pvh := &provider.VersionsHandler{
+		Providers: cfg.Providers,
+	}
+
+	r := chi.NewRouter()
+	r.Use(func(next http.Handler) http.Handler {
+		return httpdoc.Record(next, doc, &httpdoc.RecordOption{
+			Description:    description,
+			ExcludeHeaders: []string{"Content-Length", "User-Agent", "Accept-Encoding"},
+		})
+	})
+	r.Get("/v1/providers/{namespace}/{type}/versions", pvh.ServeHTTP)
+
+	return httptest.NewServer(r)
 }
diff --git a/testdata/config.yaml b/testdata/config.yaml
index d83c00b..76e624e 100644
--- a/testdata/config.yaml
+++ b/testdata/config.yaml
@@ -6,7 +6,17 @@ providers:
     platforms:
     - os: darwin
       arch: amd64
+    - os: linux
+      arch: amd64
     source:
       download_url: https://github.com/cappyzawa/terraform-provider-concourse/releases/download/v0.1.0/terraform-provider-concourse_0.1.0_darwin_amd64.zip
+  - name: "0.0.5"
+    platforms:
+    - os: darwin
+      arch: amd64
+    - os: linux
+      arch: amd64
+    source:
+      download_url: https://github.com/cappyzawa/terraform-provider-concourse/releases/download/v0.1.0/terraform-provider-concourse_0.0.5_darwin_amd64.zip
 
 modules: []