diff --git a/.github/workflows/conda.yml b/.github/workflows/conda.yml
index bdb9337f9..53a9549c5 100644
--- a/.github/workflows/conda.yml
+++ b/.github/workflows/conda.yml
@@ -29,7 +29,8 @@ jobs:
         with:
           miniforge-variant: Mambaforge
           use-mamba: true
-          python-version: 3.8
+          python-version: "3.8"
+          channel-priority: strict
       - name: Install dependencies
         run: |
           mamba install boa conda-verify
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3ba6d13a2..3a071338f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -26,7 +26,8 @@ jobs:
         with:
           miniforge-variant: Mambaforge
           use-mamba: true
-          python-version: 3.8
+          python-version: "3.8"
+          channel-priority: strict
           activate-environment: dask-sql
           environment-file: continuous_integration/environment-3.8-jdk11-dev.yaml
       - name: Install dependencies
diff --git a/.github/workflows/test-upstream.yml b/.github/workflows/test-upstream.yml
index 3c5ec5405..bdd03dd61 100644
--- a/.github/workflows/test-upstream.yml
+++ b/.github/workflows/test-upstream.yml
@@ -26,7 +26,8 @@ jobs:
         with:
           miniforge-variant: Mambaforge
           use-mamba: true
-          python-version: 3.8
+          python-version: "3.8"
+          channel-priority: strict
           activate-environment: dask-sql
           environment-file: continuous_integration/environment-3.8-jdk11-dev.yaml
       - name: Install dependencies and build the jar
@@ -52,7 +53,7 @@ jobs:
       matrix:
         java: [8, 11]
         os: [ubuntu-latest, windows-latest]
-        python: [3.7, 3.8, 3.9]
+        python: ["3.7", "3.8", "3.9"]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -68,6 +69,7 @@ jobs:
           miniforge-variant: Mambaforge
           use-mamba: true
           python-version: ${{ matrix.python }}
+          channel-priority: strict
           activate-environment: dask-sql
           environment-file: ${{ env.CONDA_FILE }}
       - name: Download the pre-build jar
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6f83c0c0a..248e56773 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -53,7 +53,8 @@ jobs:
         with:
           miniforge-variant: Mambaforge
           use-mamba: true
-          python-version: 3.8
+          python-version: "3.8"
+          channel-priority: strict
           activate-environment: dask-sql
           environment-file: continuous_integration/environment-3.8-jdk11-dev.yaml
       - name: Build the jar
@@ -76,7 +77,7 @@ jobs:
       matrix:
         java: [8, 11]
         os: [ubuntu-latest, windows-latest]
-        python: [3.7, 3.8, 3.9]
+        python: ["3.7", "3.8", "3.9"]
     steps:
       - uses: actions/checkout@v2
       - name: Cache local Maven repository
@@ -90,6 +91,7 @@ jobs:
           miniforge-variant: Mambaforge
           use-mamba: true
           python-version: ${{ matrix.python }}
+          channel-priority: strict
           activate-environment: dask-sql
           environment-file: ${{ env.CONDA_FILE }}
       - name: Download the pre-build jar
@@ -145,7 +147,8 @@ jobs:
         with:
           miniforge-variant: Mambaforge
           use-mamba: true
-          python-version: 3.8
+          python-version: "3.8"
+          channel-priority: strict
           activate-environment: dask-sql
           environment-file: continuous_integration/environment-3.8-jdk11-dev.yaml
       - name: Download the pre-build jar
@@ -195,10 +198,10 @@ jobs:
       - name: Set up Python
         uses: conda-incubator/setup-miniconda@v2
         with:
-          python-version: 3.8
+          python-version: "3.8"
           mamba-version: "*"
           channels: conda-forge,defaults
-          channel-priority: true
+          channel-priority: strict
       - name: Download the pre-build jar
         uses: actions/download-artifact@v1
         with:
diff --git a/continuous_integration/environment-3.7-jdk11-dev.yaml b/continuous_integration/environment-3.7-jdk11-dev.yaml
index 80651e6fa..4c8ff4671 100644
--- a/continuous_integration/environment-3.7-jdk11-dev.yaml
+++ b/continuous_integration/environment-3.7-jdk11-dev.yaml
@@ -1,6 +1,7 @@
 name: dask-sql
 channels:
 - conda-forge
+- nodefaults
 dependencies:
 - adagio>=0.2.3
 - antlr4-python3-runtime>=4.9.2
diff --git a/continuous_integration/environment-3.7-jdk8-dev.yaml b/continuous_integration/environment-3.7-jdk8-dev.yaml
index 76d22e9dd..ebfb4a172 100644
--- a/continuous_integration/environment-3.7-jdk8-dev.yaml
+++ b/continuous_integration/environment-3.7-jdk8-dev.yaml
@@ -1,6 +1,7 @@
 name: dask-sql
 channels:
 - conda-forge
+- nodefaults
 dependencies:
 - adagio>=0.2.3
 - antlr4-python3-runtime>=4.9.2
diff --git a/continuous_integration/environment-3.8-jdk11-dev.yaml b/continuous_integration/environment-3.8-jdk11-dev.yaml
index df66278ff..ddf84ab5a 100644
--- a/continuous_integration/environment-3.8-jdk11-dev.yaml
+++ b/continuous_integration/environment-3.8-jdk11-dev.yaml
@@ -1,6 +1,7 @@
 name: dask-sql
 channels:
 - conda-forge
+- nodefaults
 dependencies:
 - adagio>=0.2.3
 - antlr4-python3-runtime>=4.9.2
diff --git a/continuous_integration/environment-3.8-jdk8-dev.yaml b/continuous_integration/environment-3.8-jdk8-dev.yaml
index 28ca36336..bc6980584 100644
--- a/continuous_integration/environment-3.8-jdk8-dev.yaml
+++ b/continuous_integration/environment-3.8-jdk8-dev.yaml
@@ -1,6 +1,7 @@
 name: dask-sql
 channels:
 - conda-forge
+- nodefaults
 dependencies:
 - adagio>=0.2.3
 - antlr4-python3-runtime>=4.9.2
diff --git a/continuous_integration/environment-3.9-jdk11-dev.yaml b/continuous_integration/environment-3.9-jdk11-dev.yaml
index f71fc889e..7f7b19be2 100644
--- a/continuous_integration/environment-3.9-jdk11-dev.yaml
+++ b/continuous_integration/environment-3.9-jdk11-dev.yaml
@@ -1,6 +1,7 @@
 name: dask-sql
 channels:
 - conda-forge
+- nodefaults
 dependencies:
 - adagio>=0.2.3
 - antlr4-python3-runtime>=4.9.2
diff --git a/continuous_integration/environment-3.9-jdk8-dev.yaml b/continuous_integration/environment-3.9-jdk8-dev.yaml
index 999cf6fd3..a7f35a132 100644
--- a/continuous_integration/environment-3.9-jdk8-dev.yaml
+++ b/continuous_integration/environment-3.9-jdk8-dev.yaml
@@ -1,6 +1,7 @@
 name: dask-sql
 channels:
 - conda-forge
+- nodefaults
 dependencies:
 - adagio>=0.2.3
 - antlr4-python3-runtime>=4.9.2