diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3c6c5ce0..72bcb42c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.11
+        python-version: 0
 
     - name: Install dependencies
       run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 019ca6d8..1946b728 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.11
+        python-version: 3.10
 
     - name: Install dependencies
       run: |
@@ -58,7 +58,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-14"]
-        python: [3.7, 3.11]
+        python: [3.7, 3.10]
 
     name: Tests (${{ matrix.os }}, Python ${{ matrix.python }})
     runs-on: ${{ matrix.os }}
@@ -74,6 +74,7 @@ jobs:
           conda-solver: "libmamba"
           environment-file: environment.yml
           activate-environment: sleap-io
+          python-version: ${{ matrix.python }}
 
       - name: Print environment info
         shell: bash -l {0}
diff --git a/environment.yml b/environment.yml
index 2d3ffbeb..f8a54b60 100644
--- a/environment.yml
+++ b/environment.yml
@@ -5,9 +5,10 @@ channels:
   - defaults
 
 dependencies:
-  - python=3.11
+  - python=3.10
   - ffmpeg
   - imageio
+  - imageio-ffmpeg
   - attrs
   - pandas
   - h5py
diff --git a/pyproject.toml b/pyproject.toml
index 787f007f..a216a325 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,8 +17,7 @@ classifiers = [
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11"
+    "Programming Language :: Python :: 3.10"
 ]
 dependencies = [
     "numpy>=1.19.2",