diff --git a/nextstrain/cli/runner/conda.py b/nextstrain/cli/runner/conda.py
index da49ac08..03a607d1 100644
--- a/nextstrain/cli/runner/conda.py
+++ b/nextstrain/cli/runner/conda.py
@@ -28,7 +28,7 @@
     <https://anaconda.org/conda-forge/micromamba/>`__, or the special string
     ``latest``.
 
-    Defaults to ``0.27.0``.
+    Defaults to ``1.0.0``.
 """
 
 import json
@@ -59,7 +59,7 @@
 
 # If you update the version pin below, please update the docstring above too.
 MICROMAMBA_VERSION = os.environ.get("NEXTSTRAIN_CONDA_MICROMAMBA_VERSION") \
-                  or "0.27.0"
+                  or "1.0.0"
 
 NEXTSTRAIN_CHANNEL = os.environ.get("NEXTSTRAIN_CONDA_CHANNEL") \
                   or "nextstrain"