diff --git a/build_installer.py b/build_installer.py
index be489be..1c5d44e 100755
--- a/build_installer.py
+++ b/build_installer.py
@@ -93,7 +93,7 @@ if __name__ == "__main__":
     )
     parser.add_argument(
         "--micromamba_version",
-        default="1.3.1",
+        default="1.5.12",
         help=(
             "Version of micromamba to download and bundle into the installer."
             " (default: %(default)s)"