diff --git a/preprocessing/nextclade/Dockerfile b/preprocessing/nextclade/Dockerfile
index 619ee3dce..be1e6ed36 100644
--- a/preprocessing/nextclade/Dockerfile
+++ b/preprocessing/nextclade/Dockerfile
@@ -1,4 +1,4 @@
-FROM mambaorg/micromamba:1.5.6
+FROM mambaorg/micromamba:1.5.7
 
 COPY --chown=$MAMBA_USER:$MAMBA_USER environment.yml /tmp/env.yaml
 COPY --chown=$MAMBA_USER:$MAMBA_USER .mambarc /tmp/.mambarc
diff --git a/preprocessing/nextclade/environment.yml b/preprocessing/nextclade/environment.yml
index b096e9845..28a85ee30 100644
--- a/preprocessing/nextclade/environment.yml
+++ b/preprocessing/nextclade/environment.yml
@@ -9,6 +9,6 @@ dependencies:
   - PyYAML
   - requests=2.31
   - pyjwt=2.8
-  - dateutil=2.9
+  - python-dateutil=2.9
   - pytz=2024.1
   - pip
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