diff --git a/maestro-sdk.cabal b/maestro-sdk.cabal
index ae05bf0..0df89b4 100644
--- a/maestro-sdk.cabal
+++ b/maestro-sdk.cabal
@@ -84,22 +84,22 @@ library
       Maestro.Types.V1.Transactions
 
     build-depends:
-      aeson ^>=2.1.2.1,
+      aeson ^>=2.1,
       base ^>=4.14.3.0 || ^>=4.16.4.0 || ^>=4.18.0.0,
-      bytestring ^>=0.10.12.0 || ^>=0.11.4.0,
-      containers ^>=0.6.5.1,
-      data-default-class ^>=0.1.2.0,
-      deriving-aeson ^>=0.2.9,
-      http-api-data ^>=0.6,
-      http-client ^>=0.7.14,
-      http-client-tls ^>=0.3.6.3,
-      http-types ^>=0.12.3,
-      retry ^>=0.9.3.1,
-      servant ^>=0.20,
-      servant-client ^>=0.20,
-      servant-client-core ^>=0.20,
-      text ^>=1.2.4.1 || ^>=2.0.2,
-      time ^>=1.9.3 || ^>=1.11.1.1 || ^>=1.12.2
+      bytestring ^>=0.10 || ^>=0.11,
+      containers ^>=0.6,
+      data-default-class ^>=0.1,
+      deriving-aeson ^>=0.2,
+      http-api-data ^>=0.5 || ^>=0.6,
+      http-client ^>=0.7,
+      http-client-tls ^>=0.3,
+      http-types ^>=0.12,
+      retry ^>=0.9,
+      servant ^>=0.19 || ^>=0.20,
+      servant-client ^>=0.19 || ^>=0.20,
+      servant-client-core ^>=0.19 || ^>=0.20,
+      text ^>=1.2 || ^>=2.0,
+      time ^>=1.9 || ^>=1.11 || ^>=1.12
 
     hs-source-dirs:   src
     default-language: Haskell2010
diff --git a/src/Maestro/API/V1/TxManager.hs b/src/Maestro/API/V1/TxManager.hs
index ddfaf0c..6b9307f 100644
--- a/src/Maestro/API/V1/TxManager.hs
+++ b/src/Maestro/API/V1/TxManager.hs
@@ -10,10 +10,10 @@ data TxManagerAPI route = TxManagerAPI
   { monitoredTxSubmit ::
       route
         :- ReqBody' '[Required] '[CBORStream] BS.ByteString
-        :> PostAccepted '[JSON] T.Text
+        :> PostAccepted '[PlainText] T.Text
   , monitoredTurboTxSubmit ::
       route
         :- ReqBody' '[Required] '[CBORStream] BS.ByteString
-        :> PostAccepted '[JSON] T.Text
+        :> PostAccepted '[PlainText] T.Text
   }
   deriving (Generic)