diff --git a/Miniforge3/construct.yaml b/Miniforge3/construct.yaml
index df974198..8cff0c90 100644
--- a/Miniforge3/construct.yaml
+++ b/Miniforge3/construct.yaml
@@ -3,7 +3,7 @@
 {% set conda_libmamba_solver_version = "24.9.0"%}
 # when mamba_version is updated here, also update MICROMAMBA_VERSION
 # in scripts/build.sh
-{% set mamba_version = "2.0.2"%}
+{% set mamba_version = "1.5.9"%}
 
 name: {{ name }}
 version: {{ version }}
diff --git a/scripts/build.sh b/scripts/build.sh
index 6ddc2082..30f43a33 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -38,7 +38,7 @@ cp LICENSE "${TEMP_DIR}/"
 ls -al "${TEMP_DIR}"
 
 if [[ "${TARGET_PLATFORM}" != win-* ]]; then
-    MICROMAMBA_VERSION=2.0.2
+    MICROMAMBA_VERSION=1.5.9
     MICROMAMBA_BUILD=0
     mkdir "${TEMP_DIR}/micromamba"
     pushd "${TEMP_DIR}/micromamba"