diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 23e46fc..5f1b74d 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -6,7 +6,7 @@ jobs:
   unit-test:
     strategy:
       matrix:
-        go: ["1.11", "1.12", "1.13", "1.14"]
+        go: ['1.18']
         platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     name: Go ${{ matrix.go }} [${{ matrix.platform }}]
diff --git a/.gitignore b/.gitignore
index 2920fce..39785d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,4 +26,6 @@ _testmain.go
 
 pre-commit
 main
-build
\ No newline at end of file
+build
+
+.vscode/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b9a6e04..61e942e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,9 +8,9 @@
 
 ## 0.5.0 2018-09-17
 
-- fix [#8](https://github.com/ONSdigital/git-diff-check/issues/8) ignore lines in a patch that are being removed rather than added / changed
+- fix [#8](https://github.com/necrophonic/git-diff-check/issues/8) ignore lines in a patch that are being removed rather than added / changed
 - adds `-version` option to display the current cli version
-- fix [#13](https://github.com/ONSdigital/git-diff-check/issues/13) add basic version check
+- fix [#13](https://github.com/necrophonic/git-diff-check/issues/13) add basic version check
 
 ## 0.4.0 2018-04-25
 
diff --git a/README.md b/README.md
index 758b432..0132f5a 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 A simple library for checking git diff output for potentially sensitive information
 
+(forked from my original at `ONSdigital/git-diff-check`)
+
 ## Pre-commit hook
 
 *Requires git 2.9+*
@@ -19,12 +21,12 @@ to test changes before you commit.
 1. Run the installer:
 
 ```sh
-$ curl -L https://raw.githubusercontent.com/ONSdigital/git-diff-check/master/install.sh | sh
+$ curl -L https://raw.githubusercontent.com/necrophonic/git-diff-check/master/install.sh | sh
 ```
 
 - **For other platforms**
 
-1. Download the latest [release](https://github.com/ONSdigital/git-diff-check/releases) for your platform
+1. Download the latest [release](https://github.com/necrophonic/git-diff-check/releases) for your platform
 1. Create (if not already) a folder to store global git hooks (e.g. `${HOME}/.githooks`)
 1. Unzip the release and place the `pre-commit` script in the global hooks folder (ensure it's executable)
 1. Configure git to use the hooks:
@@ -35,19 +37,19 @@ $ git config --global core.hooksPath <path-to-global-hooks-folder>
 
 ### From Source
 
-(requires Go 1.11+)
+(requires Go 1.18+)
 
 ```sh
-$ go get github.com/ONSdigital/git-diff-check
+$ go get github.com/necrophonic/git-diff-check
 # or ..
 $ cd ${GOPATH}
-$ git clone https://github.com/ONSdigital/git-diff-check.git src/github.com/ONSdigital/git-diff-check
+$ git clone https://github.com/necrophonic/git-diff-check.git src/github.com/necrophonic/git-diff-check
 ```
 
 Then build:
 
 ```sh
-$ cd ${GOPATH}/src/github.com/ONSdigital/git-diff-check
+$ cd ${GOPATH}/src/github.com/necrophonic/git-diff-check
 $ go build -o pre-commit cmd/pre-commit/main.go
 ```
 
diff --git a/cmd/pre-commit/main.go b/cmd/pre-commit/main.go
index 1c47be0..de0cc30 100644
--- a/cmd/pre-commit/main.go
+++ b/cmd/pre-commit/main.go
@@ -13,7 +13,7 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/ONSdigital/git-diff-check/diffcheck"
+	"github.com/necrophonic/git-diff-check/diffcheck"
 )
 
 const (
@@ -24,7 +24,7 @@ const (
 
 const (
 	// Repository defines the github repo where the source code is located
-	Repository = "ONSdigital/git-diff-check"
+	Repository = "necrophonic/git-diff-check"
 
 	// LatestVersion gives the api location of the most recent tag in github
 	LatestVersion = "https://api.github.com/repos/" + Repository + "/releases/latest"
diff --git a/diffcheck/diffcheck.go b/diffcheck/diffcheck.go
index e6f4321..57931bc 100644
--- a/diffcheck/diffcheck.go
+++ b/diffcheck/diffcheck.go
@@ -11,8 +11,8 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/ONSdigital/git-diff-check/entropy"
-	"github.com/ONSdigital/git-diff-check/rule"
+	"github.com/necrophonic/git-diff-check/entropy"
+	"github.com/necrophonic/git-diff-check/rule"
 )
 
 type (
diff --git a/diffcheck/diffcheck_test.go b/diffcheck/diffcheck_test.go
index 5ba826a..1e19054 100644
--- a/diffcheck/diffcheck_test.go
+++ b/diffcheck/diffcheck_test.go
@@ -5,7 +5,7 @@ import (
 	"os/exec"
 	"testing"
 
-	"github.com/ONSdigital/git-diff-check/diffcheck"
+	"github.com/necrophonic/git-diff-check/diffcheck"
 )
 
 type testCase struct {
diff --git a/entropy/entropy.go b/entropy/entropy.go
index 980a227..8c9ae0e 100644
--- a/entropy/entropy.go
+++ b/entropy/entropy.go
@@ -26,8 +26,12 @@ func CalculateShannon(data []byte) float64 {
 	}
 	entropy := 0.0
 	pX := 0.0
-	for x := 0; x < 256; x++ {
-		pX = float64(bytes.Count(data, []byte(string(x)))) / float64(len(data))
+
+	var start int32 = 0
+	var end int32 = 255
+
+	for x := start; x <= end; x++ {
+		pX = float64(bytes.Count(data, []byte{byte(x)})) / float64(len(data))
 		if pX > 0 {
 			entropy += -pX * math.Log2(pX)
 		}
diff --git a/entropy/entropy_test.go b/entropy/entropy_test.go
index 675b202..a974027 100644
--- a/entropy/entropy_test.go
+++ b/entropy/entropy_test.go
@@ -9,7 +9,7 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/ONSdigital/git-diff-check/entropy"
+	"github.com/necrophonic/git-diff-check/entropy"
 )
 
 var (
diff --git a/go.mod b/go.mod
index 472198a..36c09d2 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
-module github.com/ONSdigital/git-diff-check
+module github.com/necrophonic/git-diff-check
 
-go 1.14
+go 1.18
diff --git a/install.sh b/install.sh
index 4830195..649e3e9 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-repo='ONSdigital/git-diff-check'
+repo='necrophonic/git-diff-check'
 binary='pre-commit'
 
 get_latest_release() { # From https://gist.github.com/lukechilds/a83e1d7127b78fef38c2914c4ececc3c
diff --git a/rule/rule_test.go b/rule/rule_test.go
index 4714923..9e9a849 100644
--- a/rule/rule_test.go
+++ b/rule/rule_test.go
@@ -3,7 +3,7 @@ package rule_test
 import (
 	"testing"
 
-	"github.com/ONSdigital/git-diff-check/rule"
+	"github.com/necrophonic/git-diff-check/rule"
 )
 
 func TestInitRules(t *testing.T) {