diff --git a/env.go b/env.go
index 60932ef..941a2fb 100644
--- a/env.go
+++ b/env.go
@@ -6,8 +6,12 @@ import (
 )
 
 func MergeEnv(base, other []string) []string {
-	baseMap := envSliceToMap(base)
 	otherMap := envSliceToMap(other)
+	return MergeEnvWithMap(base, otherMap)
+}
+
+func MergeEnvWithMap(base []string, otherMap map[string]string) []string {
+	baseMap := envSliceToMap(base)
 	for key, value := range otherMap {
 		baseMap[key] = value
 	}
diff --git a/flexentry.go b/flexentry.go
index e66e620..6345110 100644
--- a/flexentry.go
+++ b/flexentry.go
@@ -20,8 +20,9 @@ import (
 type Entrypoint struct {
 	Executer
 
-	mu    sync.Mutex
-	query *gojq.Query
+	mu           sync.Mutex
+	commandQuery *gojq.Query
+	environQuery *gojq.Query
 }
 
 func (e *Entrypoint) Run(ctx context.Context, args ...string) error {
@@ -103,7 +104,7 @@ func (e *Entrypoint) DetectCommand(ctx context.Context, event Event) ([]string,
 		return commands, nil
 	}
 	if data, ok := event.(map[string]interface{}); ok {
-		query, err := e.getQuery()
+		query, err := e.getCommandQuery()
 		if err != nil {
 			return nil, err
 		}
@@ -135,20 +136,72 @@ func (e *Entrypoint) DetectCommand(ctx context.Context, event Event) ([]string,
 	return nil, errors.New("FLEXENTRY_COMMAND is required")
 }
 
-func (e *Entrypoint) getQuery() (*gojq.Query, error) {
+func (e *Entrypoint) DetectEnviron(ctx context.Context, event Event) ([]string, error) {
+	if data, ok := event.(map[string]interface{}); ok {
+		query, err := e.getEnvironQuery()
+		if err != nil {
+			return nil, err
+		}
+		environ := make([]string, 0, 1)
+		iter := query.RunWithContext(ctx, data)
+		for {
+			v, ok := iter.Next()
+			if !ok {
+				break
+			}
+			if err, ok := v.(error); ok {
+				return nil, fmt.Errorf("environ parse failed: %w", err)
+			}
+			if e, ok := v.(string); ok {
+				environ = MergeEnv(environ, []string{e})
+				continue
+			}
+			if es, ok := v.([]string); ok {
+				environ = MergeEnv(environ, es)
+				continue
+			}
+			if es, ok := v.(map[string]string); ok {
+				environ = MergeEnvWithMap(environ, es)
+				continue
+			}
+		}
+		return environ, nil
+	}
+	return []string{}, nil
+}
+
+func (e *Entrypoint) getCommandQuery() (*gojq.Query, error) {
 	e.mu.Lock()
 	defer e.mu.Unlock()
-	if e.query != nil {
-		return e.query, nil
+	if e.commandQuery != nil {
+		return e.commandQuery, nil
 	}
 	jqExpr := ".cmd"
 	if j := os.Getenv("FLEXENTRY_COMMAND_JQ_EXPR"); j != "" {
 		jqExpr = j
 	}
 	var err error
-	e.query, err = gojq.Parse(jqExpr)
+	e.commandQuery, err = gojq.Parse(jqExpr)
+	if err != nil {
+		return nil, err
+	}
+	return e.commandQuery, nil
+}
+
+func (e *Entrypoint) getEnvironQuery() (*gojq.Query, error) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+	if e.environQuery != nil {
+		return e.environQuery, nil
+	}
+	jqExpr := ".env"
+	if j := os.Getenv("FLEXENTRY_ENVIRON_JQ_EXPR"); j != "" {
+		jqExpr = j
+	}
+	var err error
+	e.environQuery, err = gojq.Parse(jqExpr)
 	if err != nil {
 		return nil, err
 	}
-	return e.query, nil
+	return e.environQuery, nil
 }
diff --git a/flexentry_test.go b/flexentry_test.go
index b8a4442..8e0e7f8 100644
--- a/flexentry_test.go
+++ b/flexentry_test.go
@@ -88,3 +88,79 @@ func TestEntrypointDetectCommand(t *testing.T) {
 		})
 	}
 }
+
+func TestEntrypointDetectEnviron(t *testing.T) {
+	cases := []struct {
+		preAction  func()
+		postAction func()
+		event      flexentry.Event
+		expected   []string
+	}{
+		{
+			event:    "echo hoge",
+			expected: []string{},
+		},
+		{
+			event: map[string]interface{}{
+				"cmd": "echo hoge",
+			},
+			expected: []string{},
+		},
+		{
+			event: map[string]interface{}{
+				"cmd": "echo hoge",
+				"env": map[string]string{
+					"HOGE": "fuga",
+				},
+			},
+			expected: []string{"HOGE=fuga"},
+		},
+		{
+			preAction: func() {
+				os.Setenv("FLEXENTRY_ENVIRON_JQ_EXPR", ".environ")
+			},
+			postAction: func() {
+				os.Unsetenv("FLEXENTRY_ENVIRON_JQ_EXPR")
+			},
+			event: map[string]interface{}{
+				"cmd": "echo hoge",
+				"env": map[string]string{
+					"HOGE": "fuga",
+					"FUGA": "hoge",
+				},
+				"environ": map[string]string{
+					"HOGE": "hoge",
+				},
+			},
+			expected: []string{"HOGE=hoge"},
+		},
+		{
+			event: map[string]interface{}{
+				"cmd": "echo hoge",
+				"env": []string{
+					"HOGE=fuga",
+					"FUGA=hoge",
+				},
+			},
+			expected: []string{
+				"HOGE=fuga",
+				"FUGA=hoge",
+			},
+		},
+	}
+
+	for i, c := range cases {
+		t.Run(fmt.Sprintf("case.%d", i), func(t *testing.T) {
+			if c.preAction != nil {
+				c.preAction()
+			}
+			if c.postAction != nil {
+				defer c.postAction()
+			}
+			e := &flexentry.Entrypoint{}
+			actual, err := e.DetectEnviron(context.Background(), c.event)
+			require.NoError(t, err)
+			require.ElementsMatch(t, c.expected, actual)
+		})
+	}
+}