diff --git a/dist/main.js b/dist/main.js
index c6cc7d2..969bc32 100644
--- a/dist/main.js
+++ b/dist/main.js
@@ -82803,7 +82803,7 @@ var getOptions = () => {
     ),
     micromambaVersion: parseOrUndefined(
       "micromamba-version",
-      unionType([literalType("latest"), stringType().regex(/^\d+\.\d+\.\d+-\d+$/)]),
+      unionType([literalType("latest"), stringType().regex(/^\d+\.\d+\.\d+(?:\.(?:rc|alpha|beta)\d+)?-\d+$/)]),
       "micromamba-version must be either `latest` or a version matching `1.2.3-0`."
     ),
     micromambaUrl: parseOrUndefined("micromamba-url", stringType().url()),
diff --git a/dist/post.js b/dist/post.js
index 9eaf0b6..ad352a0 100644
--- a/dist/post.js
+++ b/dist/post.js
@@ -81846,7 +81846,7 @@ var getOptions = () => {
     ),
     micromambaVersion: parseOrUndefined(
       "micromamba-version",
-      unionType([literalType("latest"), stringType().regex(/^\d+\.\d+\.\d+-\d+$/)]),
+      unionType([literalType("latest"), stringType().regex(/^\d+\.\d+\.\d+(?:\.(?:rc|alpha|beta)\d+)?-\d+$/)]),
       "micromamba-version must be either `latest` or a version matching `1.2.3-0`."
     ),
     micromambaUrl: parseOrUndefined("micromamba-url", stringType().url()),
diff --git a/src/options.ts b/src/options.ts
index df08a1b..7c568af 100644
--- a/src/options.ts
+++ b/src/options.ts
@@ -295,7 +295,7 @@ export const getOptions = () => {
     ),
     micromambaVersion: parseOrUndefined(
       'micromamba-version',
-      z.union([z.literal('latest'), z.string().regex(/^\d+\.\d+\.\d+-\d+$/)]),
+      z.union([z.literal('latest'), z.string().regex(/^\d+\.\d+\.\d+(?:\.(?:rc|alpha|beta)\d+)?-\d+$/)]),
       'micromamba-version must be either `latest` or a version matching `1.2.3-0`.'
     ),
     micromambaUrl: parseOrUndefined('micromamba-url', z.string().url()),