diff --git a/Dockerfile b/Dockerfile
index 7401d49198..6d20384ca6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ ARG VERSION=""
 ARG BUILDNUM=""
 
 # Build Geth in a stock Go builder container
-FROM golang:1.21-alpine as builder
+FROM golang:1.20-alpine as builder
 
 RUN apk add --no-cache build-base libc-dev
 RUN apk add --no-cache gcc musl-dev linux-headers git
diff --git a/core/opcodeCompiler/compiler/opcodeProcessor.go b/core/opcodeCompiler/compiler/opcodeProcessor.go
index a5c04006e1..1058f53f11 100644
--- a/core/opcodeCompiler/compiler/opcodeProcessor.go
+++ b/core/opcodeCompiler/compiler/opcodeProcessor.go
@@ -52,7 +52,10 @@ func GetOpcodeProcessorInstance() *OpcodeProcessor {
 			taskChannel: make(chan optimizeTask, taskChannelSize),
 		}
 		// start task processors.
-		taskNumber := max(runtime.NumCPU()*3/8, 1)
+		taskNumber := runtime.NumCPU() * 3 / 8
+		if taskNumber < 1 {
+			taskNumber = 1
+		}
 
 		for i := 0; i < taskNumber; i++ {
 			go opcodeProcessor.taskProcessor()
diff --git a/go.mod b/go.mod
index 034dedf77c..0edef69124 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,7 @@
 module github.com/ethereum/go-ethereum
 
-go 1.21
+go 1.20
 
-toolchain go1.21.4
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v0.3.0