diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8c023a6b..a55666f4 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -14,7 +14,6 @@ jobs:
 
     environment:
       TEST_DATA_HOME: "/tmp/tests-data"
-      ANTSPATH: "/tmp/ants"
 
     working_directory: /tmp/tests
     steps:
@@ -23,24 +22,24 @@ jobs:
 
       - restore_cache:
           keys:
-            - ants-v1-{{ .Branch }}-{{ .Revision }}
-            - ants-v1--{{ .Revision }}
-            - ants-v1-{{ .Branch }}-
-            - ants-v1-main-
-            - ants-v1-
+            - micromamba-v1-{{ .Branch }}-{{ .Revision }}
+            - micromamba-v1--{{ .Revision }}
+            - micromamba-v1-{{ .Branch }}-
+            - micromamba-v1-main-
+            - micromamba-v1-
 
       - run:
           name: Install ANTs
           command: |
-            if [[ ! -d "${ANTSPATH}" ]]; then
-              mkdir -p ${ANTSPATH}
-              curl -sSL "https://dl.dropbox.com/s/gwf51ykkk5bifyj/ants-Linux-centos6_x86_64-v2.3.4.tar.gz" | tar -xzC $ANTSPATH --strip-components 1
-            fi
+            eval "$(micromamba shell hook --shell bash)"
+            micromamba activate
+            micromamba shell init --shell bash --root-prefix=/tmp/micromamba
+            micromamba install -y -c conda-forge "ants=2.5"
 
       - save_cache:
-          key: ants-v1-{{ .Branch }}-{{ .Revision }}
+          key: micromamba-v1-{{ .Branch }}-{{ .Revision }}
           paths:
-            - /tmp/ants
+            - /tmp/micromamba
 
       - run:
           name: Configure git (pacify datalad)
@@ -74,15 +73,13 @@ jobs:
       - run:
           name: Initiate versioning
           command: |
-            python3 -m pip install -U build hatch hatchling pip twine docutils
-
-            pip install /tmp/src/eddymotion[all]
+            micromamba run -n base python -m pip install -U build hatch hatchling pip twine docutils
+            micromamba run -n base python -m pip install /tmp/src/eddymotion[all]
 
       - run:
           name: Run tests
           command: |
-            export PATH="${ANTSPATH}:$PATH"
-            pytest -n auto --doctest-modules /tmp/src/eddymotion/src /tmp/src/eddymotion/test
+            micromamba run -n base pytest -n auto --doctest-modules /tmp/src/eddymotion/src /tmp/src/eddymotion/test
 
 workflows:
   version: 2