diff --git a/tests/helpers/utils.nim b/tests/helpers/utils.nim
index 5008329..93d9816 100644
--- a/tests/helpers/utils.nim
+++ b/tests/helpers/utils.nim
@@ -6,9 +6,6 @@ import
   ../../web3/primitives
 
 proc deployContract*(web3: Web3, code: string, gasPrice = 0): Future[ReceiptObject] {.async.} =
-  let provider = web3.provider
-  let accounts = await provider.eth_accounts()
-
   var code = code
   var tr: EthSend
   tr.`from` = web3.defaultAccount
diff --git a/tests/test_contracts.nim b/tests/test_contracts.nim
index 2507fa8..74137fe 100644
--- a/tests/test_contracts.nim
+++ b/tests/test_contracts.nim
@@ -211,7 +211,7 @@ suite "Contracts":
           fromAddr, toAddr: Address, value: UInt256)
           {.raises: [], gcsafe.}:
         try:
-          echo "onTransfer: ", fromAddr, " transferred ", value, " to ", toAddr
+          echo "onTransfer: ", fromAddr, " transferred ", value.toHex, " to ", toAddr
           inc notificationsReceived
           assert(fromAddr == web3.defaultAccount)
           assert((notificationsReceived == 1 and value == 50.u256) or
@@ -222,12 +222,15 @@ suite "Contracts":
           # chronos still raises exceptions which inherit directly from Exception
           doAssert false, err.msg
 
-      echo "getbalance (now): ", await ns.getBalance(web3.defaultAccount).call()
-      echo "getbalance (after creation): ", await ns.getBalance(web3.defaultAccount).call(blockNumber = deployedAtBlock)
+      let balNow = await ns.getBalance(web3.defaultAccount).call()
+      echo "getbalance (now): ", balNow.toHex
+      let balNew = await ns.getBalance(web3.defaultAccount).call(blockNumber = deployedAtBlock)
+      echo "getbalance (after creation): ", balNew.toHex
 
       # Let's try to get the balance at a point in time where the contract was not deployed yet:
       try:
-        echo "getbalance (first block): ", await ns.getBalance(web3.defaultAccount).call(blockNumber = 1'u64)
+        let balFirst = await ns.getBalance(web3.defaultAccount).call(blockNumber = 1'u64)
+        echo "getbalance (first block): ", balFirst.toHex
       except CatchableError as err:
         echo "getbalance (first block): ", err.msg
 
diff --git a/tests/test_logs.nim b/tests/test_logs.nim
index 97084de..0475de5 100644
--- a/tests/test_logs.nim
+++ b/tests/test_logs.nim
@@ -79,7 +79,7 @@ suite "Logs":
             sender: Address, value: UInt256)
             {.raises: [], gcsafe.}:
           try:
-            echo "onEvent: ", sender, " value ", value
+            echo "onEvent: ", sender, " value ", value.toHex
             inc notificationsReceived
 
             if notificationsReceived == invocationsBefore + invocationsAfter:
diff --git a/web3.nim b/web3.nim
index 67e5056..77aeac7 100644
--- a/web3.nim
+++ b/web3.nim
@@ -196,7 +196,7 @@ proc unsubscribe*(s: Subscription): Future[void] {.async.} =
   discard await s.web3.provider.eth_unsubscribe(s.id)
 
 proc getJsonLogs(s: Web3SenderImpl, topic: openarray[byte],
-                  fromBlock, toBlock = none(RtBlockIdentifier),
+                  fromBlock = none(RtBlockIdentifier), toBlock = none(RtBlockIdentifier),
                   blockHash = none(BlockHash)): Future[JsonNode] =
   var options = newJObject()
   options["address"] = %s.contractAddress
@@ -216,7 +216,7 @@ proc getJsonLogs(s: Web3SenderImpl, topic: openarray[byte],
 
 proc getJsonLogs*[TContract](s: Sender[TContract],
                   EventName: type,
-                  fromBlock, toBlock = none(RtBlockIdentifier),
+                  fromBlock= none(RtBlockIdentifier), toBlock = none(RtBlockIdentifier),
                   blockHash = none(BlockHash)): Future[JsonNode] {.inline.} =
   mixin eventTopic
   getJsonLogs(s.sender, eventTopic(EventName))
diff --git a/web3.nimble b/web3.nimble
index 719bdec..5233a47 100644
--- a/web3.nimble
+++ b/web3.nimble
@@ -16,7 +16,8 @@ license     = "MIT or Apache License 2.0"
 ### Dependencies
 requires "nim >= 1.6.0"
 requires "chronicles"
-requires "chronos"
+requires "chronos#head"
+requires "bearssl#head"
 requires "eth"
 requires "faststreams"
 requires "json_rpc"
diff --git a/web3/contract_dsl.nim b/web3/contract_dsl.nim
index a64f1c0..d49c3ca 100644
--- a/web3/contract_dsl.nim
+++ b/web3/contract_dsl.nim
@@ -295,7 +295,7 @@ macro contract*(cname: untyped, body: untyped): untyped =
                          options: JsonNode,
                          `callbackIdent`: `procTy`,
                          errorHandler: SubscriptionErrorHandler,
-                         withHistoricEvents = true): Future[Subscription] =
+                         withHistoricEvents = true): Future[Subscription] {.used.} =
             proc eventHandler(`jsonIdent`: JsonNode) {.gcsafe, raises: [].} =
               try:
                 `argParseBody`
@@ -310,7 +310,7 @@ macro contract*(cname: untyped, body: untyped): untyped =
                          options: JsonNode,
                          `callbackIdent`: `procTyWithRawData`,
                          errorHandler: SubscriptionErrorHandler,
-                         withHistoricEvents = true): Future[Subscription] =
+                         withHistoricEvents = true): Future[Subscription] {.used.} =
             proc eventHandler(`jsonIdent`: JsonNode) {.gcsafe, raises: [].} =
               try:
                 `argParseBody`