diff --git a/Dockerfile b/Dockerfile
index 3d5f71f54..814273571 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build
-FROM golang:1.20.6-alpine AS build-env
+FROM golang:1.21-alpine AS build-env
 RUN apk add build-base
 WORKDIR /app
 COPY . /app
diff --git a/README.md b/README.md
index 749098226..dc225e588 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ OPTIMIZATION:
 
 # Installation
 
-`subfinder` requires **go1.20** to install successfully. Run the following command to install the latest version:
+`subfinder` requires **go1.21** to install successfully. Run the following command to install the latest version:
 
 ```sh
 go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest