diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4c378b3f..e008054c 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ jobs:
   # Conda
   "conda-3.7":
     docker:
-      - image: continuumio/miniconda3
+      - image: mambaorg/micromamba
     environment:
       PYTHON: "3.7"
       PANDAS: "0.24.2"
@@ -15,12 +15,12 @@ jobs:
       - checkout
       - run: ci/config_auth.sh
       - run: ci/run_conda.sh
-  "conda-3.9-NIGHTLY":
+  "conda-3.9":
     docker:
-      - image: continuumio/miniconda3
+      - image: mambaorg/micromamba
     environment:
       PYTHON: "3.9"
-      PANDAS: "NIGHTLY"
+      PANDAS: "1.3.4"
     steps:
       - checkout
       - run: ci/config_auth.sh
@@ -31,4 +31,4 @@ workflows:
   build:
     jobs:
       - "conda-3.7"
-      - "conda-3.9-NIGHTLY"
+      - "conda-3.9"
diff --git a/ci/requirements-3.9-NIGHTLY.conda b/ci/requirements-3.9-1.3.4.conda
similarity index 86%
rename from ci/requirements-3.9-NIGHTLY.conda
rename to ci/requirements-3.9-1.3.4.conda
index 5a3e9fb7..73595253 100644
--- a/ci/requirements-3.9-NIGHTLY.conda
+++ b/ci/requirements-3.9-1.3.4.conda
@@ -1,10 +1,13 @@
+codecov
+coverage
 db-dtypes
-pydata-google-auth
+fastavro
+flake8
 google-cloud-bigquery
 google-cloud-bigquery-storage
+numpy
 pyarrow
+pydata-google-auth
 pytest
 pytest-cov
-codecov
-coverage
-flake8
+tqdm
diff --git a/ci/run_conda.sh b/ci/run_conda.sh
index e29da98a..11b5b569 100755
--- a/ci/run_conda.sh
+++ b/ci/run_conda.sh
@@ -6,25 +6,16 @@
 set -e -x
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
 
-# Install dependencies using Conda
+eval "$(micromamba shell hook --shell=bash)"
+micromamba activate
 
-conda config --set always_yes yes --set changeps1 no
-conda config --add channels pandas
-conda config --add channels conda-forge
-conda update -q conda
-conda info -a
-conda create -q -n test-environment python=$PYTHON
-source activate test-environment
+# Install dependencies using (micro)mamba
+# https://github.com/mamba-org/micromamba-docker
 REQ="ci/requirements-${PYTHON}-${PANDAS}"
-conda install -q --file "$REQ.conda";
-
-if [[ "$PANDAS" == "NIGHTLY" ]]; then
-  conda install -q numpy pytz python-dateutil;
-  PRE_WHEELS="https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com";
-  pip install --pre --upgrade --timeout=60 -f $PRE_WHEELS pandas;
-else
-  conda install -q pandas=$PANDAS;
-fi
+micromamba install -q pandas=$PANDAS python=${PYTHON} -c conda-forge;
+micromamba install -q --file "$REQ.conda" -c conda-forge;
+micromamba list
+micromamba info
 
 python setup.py develop --no-deps