diff --git a/dist/index.js b/dist/index.js
index 26214d0..a167ab0 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -363,7 +363,7 @@ class DotnetCoreInstaller {
         let resolvedVersion = '';
         const installedByScriptPattern = /Installed version is (?<version>\d+\.\d+\.\d.*)$/m;
         const preinstalledOnRunnerPattern = /.NET Core SDK with version '(?<version>\d+\.\d+\.\d.*)'/m;
-        let regExpressions = [
+        const regExpressions = [
             installedByScriptPattern,
             preinstalledOnRunnerPattern
         ];
@@ -447,7 +447,7 @@ function run() {
             // Proxy, auth, (etc) are still set up, even if no version is identified
             //
             const versions = core.getMultilineInput('dotnet-version');
-            let installedDotnetVersions = [];
+            const installedDotnetVersions = [];
             const globalJsonFileInput = core.getInput('global-json-file');
             if (globalJsonFileInput) {
                 const globalJsonPath = path_1.default.join(process.cwd(), globalJsonFileInput);
@@ -473,7 +473,7 @@ function run() {
                 const uniqueVersions = new Set(versions);
                 for (const version of uniqueVersions) {
                     dotnetInstaller = new installer_1.DotnetCoreInstaller(version, quality);
-                    let installedVersion = yield dotnetInstaller.installDotnet();
+                    const installedVersion = yield dotnetInstaller.installDotnet();
                     installedDotnetVersions.push(installedVersion);
                 }
                 installer_1.DotnetCoreInstaller.addToPath();
diff --git a/src/installer.ts b/src/installer.ts
index abf54ac..b9eedb9 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -247,7 +247,7 @@ export class DotnetCoreInstaller {
     const installedByScriptPattern = /Installed version is (?<version>\d+\.\d+\.\d.*)$/m;
     const preinstalledOnRunnerPattern = /.NET Core SDK with version '(?<version>\d+\.\d+\.\d.*)'/m;
 
-    let regExpressions: RegExp[] = [
+    const regExpressions: RegExp[] = [
       installedByScriptPattern,
       preinstalledOnRunnerPattern
     ];
diff --git a/src/setup-dotnet.ts b/src/setup-dotnet.ts
index eccdc26..6246b3b 100644
--- a/src/setup-dotnet.ts
+++ b/src/setup-dotnet.ts
@@ -27,7 +27,7 @@ export async function run() {
     // Proxy, auth, (etc) are still set up, even if no version is identified
     //
     const versions = core.getMultilineInput('dotnet-version');
-    let installedDotnetVersions: string[] = [];
+    const installedDotnetVersions: string[] = [];
 
     const globalJsonFileInput = core.getInput('global-json-file');
     if (globalJsonFileInput) {
@@ -62,7 +62,7 @@ export async function run() {
       const uniqueVersions = new Set<string>(versions);
       for (const version of uniqueVersions) {
         dotnetInstaller = new DotnetCoreInstaller(version, quality);
-        let installedVersion = await dotnetInstaller.installDotnet();
+        const installedVersion = await dotnetInstaller.installDotnet();
         installedDotnetVersions.push(installedVersion);
       }
       DotnetCoreInstaller.addToPath();