diff --git a/nitro.nimble b/nitro.nimble
index b6f62c0..21162bd 100644
--- a/nitro.nimble
+++ b/nitro.nimble
@@ -5,7 +5,7 @@ description = "Nitro state channels"
 
 requires "nim >= 1.2.6 & < 2.0.0"
 requires "nimcrypto >= 0.5.4 & < 0.6.0"
-requires "questionable >= 0.2.0 & < 0.3.0"
+requires "questionable >= 0.4.0 & < 0.5.0"
 requires "secp256k1"
 requires "stint"
 requires "stew"
diff --git a/nitro/destination.nim b/nitro/destination.nim
index d0baded..b6c664b 100644
--- a/nitro/destination.nim
+++ b/nitro/destination.nim
@@ -14,7 +14,7 @@ proc `$`*(destination: Destination): string =
   destination.toArray().toHex()
 
 proc parse*(_: type Destination, s: string): ?Destination =
-   Destination(array[32, byte].fromHex(s)).catch.toOption()
+   Destination(array[32, byte].fromHex(s)).catch.option
 
 proc `==`*(a, b: Destination): bool {.borrow.}
 
diff --git a/nitro/ethaddress.nim b/nitro/ethaddress.nim
index 7a099a5..9f68fcb 100644
--- a/nitro/ethaddress.nim
+++ b/nitro/ethaddress.nim
@@ -1,4 +1,5 @@
 import pkg/questionable
+import pkg/questionable/results
 import pkg/stew/byteutils
 
 export questionable
@@ -15,6 +16,6 @@ proc `$`*(a: EthAddress): string =
   a.toArray().toHex()
 
 proc parse*(_: type EthAddress, hex: string): ?EthAddress =
-  EthAddress(array[20, byte].fromHex(hex)).catch.toOption
+  EthAddress(array[20, byte].fromHex(hex)).catch.option
 
 proc `==`*(a, b: EthAddress): bool {.borrow.}
diff --git a/nitro/keys.nim b/nitro/keys.nim
index 0dc0640..8158f6c 100644
--- a/nitro/keys.nim
+++ b/nitro/keys.nim
@@ -21,7 +21,7 @@ proc `$`*(key: PrivateKey): string =
   key.toHex()
 
 proc parse*(_: type PrivateKey, s: string): ?PrivateKey =
-  SkSecretKey.fromHex(s).toOption()
+  SkSecretKey.fromHex(s).option
 
 proc toAddress*(key: PublicKey): EthAddress =
   let hash = keccak256.digest(key.toRaw())
diff --git a/nitro/protocol/signature.nim b/nitro/protocol/signature.nim
index 8e1a00a..97e9f8f 100644
--- a/nitro/protocol/signature.nim
+++ b/nitro/protocol/signature.nim
@@ -37,4 +37,4 @@ proc parse*(_: type Signature, s: string): ?Signature =
     var bytes = array[65, byte].fromHex(s)
     bytes[64] = bytes[64] - 27
     SkRecoverableSignature.fromRaw(bytes).get()
-  signature.toOption()
+  signature.option
diff --git a/tests/nitro/testWallet.nim b/tests/nitro/testWallet.nim
index a211794..3883d30 100644
--- a/tests/nitro/testWallet.nim
+++ b/tests/nitro/testWallet.nim
@@ -18,5 +18,6 @@ suite "nitro wallet":
     let expectedState = State(outcome: expectedOutcome)
     let expectedSignatures = @{wallet.address: key.sign(expectedState)}
     check channel.latest.isNone
-    check channel.upcoming.?state == expectedState.some
-    check channel.upcoming.?signatures == expectedSignatures.some
+    check channel.upcoming?.state == expectedState.some
+    check channel.upcoming?.signatures == expectedSignatures.some
+