diff --git a/codex.nimble b/codex.nimble
index df89e043..9fc3bf43 100644
--- a/codex.nimble
+++ b/codex.nimble
@@ -12,7 +12,7 @@ requires "bearssl >= 0.1.4"
 requires "chronicles >= 0.7.2"
 requires "chronos >= 2.5.2"
 requires "confutils"
-requires "ethers >= 0.7.0 & < 0.8.0"
+requires "ethers >= 0.7.1 & < 0.8.0"
 requires "libbacktrace"
 requires "libp2p"
 requires "metrics"
diff --git a/codex/contracts/clock.nim b/codex/contracts/clock.nim
index d5f2f4ee..9102e5c2 100644
--- a/codex/contracts/clock.nim
+++ b/codex/contracts/clock.nim
@@ -26,7 +26,7 @@ method start*(clock: OnChainClock) {.async.} =
   if clock.started:
     return
 
-  proc onBlock(blck: Block) {.upraises:[].} =
+  proc onBlock(blck: Block) =
     let blockTime = initTime(blck.timestamp.truncate(int64), 0)
     let computerTime = getTime()
     clock.offset = blockTime - computerTime
diff --git a/vendor/nim-ethers b/vendor/nim-ethers
index 2428b756..fd16d71e 160000
--- a/vendor/nim-ethers
+++ b/vendor/nim-ethers
@@ -1 +1 @@
-Subproject commit 2428b756d6fdee15017e76ec6077e890ebfd7bf6
+Subproject commit fd16d71ea58e8d3e5a7f41e5dfdaa3a9b693a815