diff --git a/__tests__/find-python.test.ts b/__tests__/find-python.test.ts
new file mode 100644
index 00000000..e779a7a2
--- /dev/null
+++ b/__tests__/find-python.test.ts
@@ -0,0 +1,18 @@
+import {desugarVersion} from '../src/find-python';
+
+describe('desugarVersion', () => {
+  it.each([
+    ['3.13', ['3.13', '']],
+    ['3.13t', ['3.13', '-freethreaded']],
+    ['3.13.1', ['3.13.1', '']],
+    ['3.13.1t', ['3.13.1', '-freethreaded']],
+    ['3.14-dev', ['~3.14.0-0', '']],
+    ['3.14t-dev', ['~3.14.0-0', '-freethreaded']],
+    ['3.14.0a4', ['3.14.0a4', '']],
+    ['3.14.0ta4', ['3.14.0a4', '-freethreaded']],
+    ['3.14.0rc1', ['3.14.0rc1', '']],
+    ['3.14.0trc1', ['3.14.0rc1', '-freethreaded']]
+  ])('%s -> %s', (input, expected) => {
+    expect(desugarVersion(input)).toEqual(expected);
+  });
+});
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 97b5e5ce..a0bed3bf 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -91006,7 +91006,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.pythonVersionToSemantic = exports.useCpythonVersion = void 0;
+exports.pythonVersionToSemantic = exports.desugarVersion = exports.useCpythonVersion = void 0;
 const os = __importStar(__nccwpck_require__(2037));
 const path = __importStar(__nccwpck_require__(1017));
 const utils_1 = __nccwpck_require__(1314);
@@ -91038,9 +91038,8 @@ function useCpythonVersion(version, architecture, updateEnvironment, checkLatest
     return __awaiter(this, void 0, void 0, function* () {
         var _a;
         let manifest = null;
-        const [desugaredVersionSpec, freethreaded] = desugarFreeThreadedVersion(version);
-        const desugaredVersionSpec2 = desugarDevVersion(desugaredVersionSpec);
-        let semanticVersionSpec = pythonVersionToSemantic(desugaredVersionSpec2, allowPreReleases);
+        const [desugaredVersionSpec, freethreaded] = desugarVersion(version);
+        let semanticVersionSpec = pythonVersionToSemantic(desugaredVersionSpec, allowPreReleases);
         core.debug(`Semantic version spec of ${version} is ${semanticVersionSpec}`);
         if (freethreaded) {
             // Free threaded versions use an architecture suffix like `x64-freethreaded`
@@ -91121,14 +91120,21 @@ function useCpythonVersion(version, architecture, updateEnvironment, checkLatest
     });
 }
 exports.useCpythonVersion = useCpythonVersion;
-/* Identify freethreaded versions like, 3.13t, 3.13t-dev, 3.14.0a1t. Returns
- * the version without the `t` and the architectures suffix, if freethreaded */
+/* Desugar free threaded and dev versions */
+function desugarVersion(versionSpec) {
+    const [desugaredVersionSpec, freethreaded] = desugarFreeThreadedVersion(versionSpec);
+    const desugaredVersionSpec2 = desugarDevVersion(desugaredVersionSpec);
+    return [desugaredVersionSpec2, freethreaded];
+}
+exports.desugarVersion = desugarVersion;
+/* Identify freethreaded versions like, 3.13t, 3.13.1t, 3.13t-dev, 3.14.0a1t.
+ * Returns the version without the `t` and the architectures suffix, if freethreaded */
 function desugarFreeThreadedVersion(versionSpec) {
     const prereleaseVersion = /(\d+\.\d+\.\d+)(t)((?:a|b|rc)\d*)/g;
     if (prereleaseVersion.test(versionSpec)) {
         return [versionSpec.replace(prereleaseVersion, '$1$3'), '-freethreaded'];
     }
-    const majorMinor = /^(\d+\.\d+)(t)$/;
+    const majorMinor = /^(\d+\.\d+(\.\d+)?)(t)$/;
     if (majorMinor.test(versionSpec)) {
         return [versionSpec.replace(majorMinor, '$1'), '-freethreaded'];
     }
diff --git a/src/find-python.ts b/src/find-python.ts
index 3c2b8b13..6685d060 100644
--- a/src/find-python.ts
+++ b/src/find-python.ts
@@ -38,11 +38,9 @@ export async function useCpythonVersion(
   allowPreReleases: boolean
 ): Promise<InstalledVersion> {
   let manifest: tc.IToolRelease[] | null = null;
-  const [desugaredVersionSpec, freethreaded] =
-    desugarFreeThreadedVersion(version);
-  const desugaredVersionSpec2 = desugarDevVersion(desugaredVersionSpec);
+  const [desugaredVersionSpec, freethreaded] = desugarVersion(version);
   let semanticVersionSpec = pythonVersionToSemantic(
-    desugaredVersionSpec2,
+    desugaredVersionSpec,
     allowPreReleases
   );
   core.debug(`Semantic version spec of ${version} is ${semanticVersionSpec}`);
@@ -167,14 +165,22 @@ export async function useCpythonVersion(
   return {impl: 'CPython', version: installed};
 }
 
-/* Identify freethreaded versions like, 3.13t, 3.13t-dev, 3.14.0a1t. Returns
- * the version without the `t` and the architectures suffix, if freethreaded */
+/* Desugar free threaded and dev versions */
+export function desugarVersion(versionSpec: string) {
+  const [desugaredVersionSpec, freethreaded] =
+    desugarFreeThreadedVersion(versionSpec);
+  const desugaredVersionSpec2 = desugarDevVersion(desugaredVersionSpec);
+  return [desugaredVersionSpec2, freethreaded];
+}
+
+/* Identify freethreaded versions like, 3.13t, 3.13.1t, 3.13t-dev, 3.14.0a1t.
+ * Returns the version without the `t` and the architectures suffix, if freethreaded */
 function desugarFreeThreadedVersion(versionSpec: string) {
   const prereleaseVersion = /(\d+\.\d+\.\d+)(t)((?:a|b|rc)\d*)/g;
   if (prereleaseVersion.test(versionSpec)) {
     return [versionSpec.replace(prereleaseVersion, '$1$3'), '-freethreaded'];
   }
-  const majorMinor = /^(\d+\.\d+)(t)$/;
+  const majorMinor = /^(\d+\.\d+(\.\d+)?)(t)$/;
   if (majorMinor.test(versionSpec)) {
     return [versionSpec.replace(majorMinor, '$1'), '-freethreaded'];
   }