diff --git a/hs-opentelemetry-propagator-datadog.cabal b/hs-opentelemetry-propagator-datadog.cabal
--- a/hs-opentelemetry-propagator-datadog.cabal
+++ b/hs-opentelemetry-propagator-datadog.cabal
@@ -1,7 +1,7 @@
 cabal-version: 2.4
 
 name: hs-opentelemetry-propagator-datadog
-version: 0.0.1.0
+version: 0.0.1.1
 author: Kazuki Okamoto (岡本和樹)
 maintainer: kazuki.okamoto@herp.co.jp
 license: BSD-3-Clause
@@ -25,7 +25,7 @@
   exposed-modules: OpenTelemetry.Propagator.Datadog
                    OpenTelemetry.Propagator.Datadog.Internal
   build-depends: bytestring,
-                 hs-opentelemetry-api ^>= 0.2,
+                 hs-opentelemetry-api ^>= 0.3,
                  http-types,
                  primitive,
                  text
diff --git a/src/OpenTelemetry/Propagator/Datadog.hs b/src/OpenTelemetry/Propagator/Datadog.hs
--- a/src/OpenTelemetry/Propagator/Datadog.hs
+++ b/src/OpenTelemetry/Propagator/Datadog.hs
@@ -14,10 +14,7 @@
 import Data.String (IsString)
 import qualified Data.Text as T
 import Data.Word (Word64)
-import Network.HTTP.Types (
-  RequestHeaders,
-  ResponseHeaders,
- )
+import Network.HTTP.Types (RequestHeaders)
 import OpenTelemetry.Common (TraceFlags (TraceFlags))
 import OpenTelemetry.Context (
   Context,
@@ -48,7 +45,7 @@
 -- Reference: bi-directional conversion of IDs of Open Telemetry and ones of Datadog
 -- - English: https://docs.datadoghq.com/tracing/other_telemetry/connect_logs_and_traces/opentelemetry/
 -- - Japanese: https://docs.datadoghq.com/ja/tracing/connect_logs_and_traces/opentelemetry/
-datadogTraceContextPropagator :: Propagator Context RequestHeaders ResponseHeaders
+datadogTraceContextPropagator :: Propagator Context RequestHeaders RequestHeaders
 datadogTraceContextPropagator =
   Propagator
     { propagatorNames = ["datadog trace context"]