diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d053d5f..1bc2065 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,22 +4,21 @@ on: [push, pull_request]
 
 jobs:
   test:
-    name: ${{ matrix.os }} ${{ matrix.python-version }}
+    name: ${{ matrix.os }} ${{ matrix.python-version }} ${{ matrix.environment }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
-        python-version: ["3.9", "3.10", "3.11"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ["3.9", "3.11"]
+        environment: [alldeps]
         include:
-          - os: windows-latest
+          - os: ubuntu-latest
+            python-version: "3.10"
+            environment: alldeps
+          - os: ubuntu-latest
             python-version: "3.9"
-          - os: windows-latest
-            python-version: "3.11"
-          - os: macos-latest
-            python-version: "3.9"
-          - os: macos-latest
-            python-version: "3.11"
+            environment: nodeps
 
     steps:
       - name: Checkout source
@@ -36,7 +35,7 @@ jobs:
           activate-environment: test
           condarc-file: continuous_integration/condarc
           python-version: ${{ matrix.python-version }}
-          environment-file: continuous_integration/environment.yml
+          environment-file: continuous_integration/environment-${{ matrix.environment }}.yml
 
       - name: Install zict
         shell: bash -l {0}
diff --git a/continuous_integration/environment-alldeps.yml b/continuous_integration/environment-alldeps.yml
new file mode 100644
index 0000000..c5d470e
--- /dev/null
+++ b/continuous_integration/environment-alldeps.yml
@@ -0,0 +1,10 @@
+name: test
+channels:
+  - conda-forge
+dependencies:
+  - psutil  # Enables extra tests
+  - python-lmdb  # Optional dependency
+  - pytest
+  - pytest-asyncio
+  - pytest-repeat
+  - pytest-timeout
diff --git a/continuous_integration/environment.yml b/continuous_integration/environment-nodeps.yml
similarity index 71%
rename from continuous_integration/environment.yml
rename to continuous_integration/environment-nodeps.yml
index 5e2374b..f30b1e4 100644
--- a/continuous_integration/environment.yml
+++ b/continuous_integration/environment-nodeps.yml
@@ -1,11 +1,7 @@
 name: test
 channels:
   - conda-forge
-  - defaults
 dependencies:
-  - pip
-  - psutil
-  - python-lmdb
   - pytest
   - pytest-asyncio
   - pytest-repeat