diff --git a/dist/index.js b/dist/index.js
index a210d87..4344db7 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -8687,7 +8687,7 @@ function run() {
                 const includePrerelease = (core.getInput('include-prerelease') || 'false').toLowerCase() ===
                     'true';
                 let dotnetInstaller;
-                for (const version of versions) {
+                for (const version of new Set(versions)) {
                     dotnetInstaller = new installer.DotnetCoreInstaller(version, includePrerelease);
                     yield dotnetInstaller.installDotnet();
                 }
diff --git a/src/setup-dotnet.ts b/src/setup-dotnet.ts
index f82bb14..65c9893 100644
--- a/src/setup-dotnet.ts
+++ b/src/setup-dotnet.ts
@@ -28,7 +28,7 @@ export async function run() {
         (core.getInput('include-prerelease') || 'false').toLowerCase() ===
         'true';
       let dotnetInstaller!: installer.DotnetCoreInstaller;
-      for (const version of versions) {
+      for (const version of new Set<string>(versions)) {
         dotnetInstaller = new installer.DotnetCoreInstaller(
           version,
           includePrerelease