diff --git a/.github/workflows/deploy-docs.yml b/.github/workflows/deploy-docs.yml
index 2b0ee1232..5bde04a76 100644
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -17,28 +17,29 @@ permissions:
 jobs:
   run:
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -l {0}
 
     steps:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-        ref: main
 
     - name: Setup Micromamba env
       uses: mamba-org/setup-micromamba@v2
       with:
         environment-name: TEST
+        init-shell: bash
         create-args: >-
           python=3
           --file requirements.txt
           --file requirements-dev.txt
 
     - name: Install folium from source
-      shell: bash -l {0}
       run: python -m pip install -e . --no-deps --force-reinstall
 
     - name: Build documentation
-      shell: bash -l {0}
       run: |
         set -e
         pushd docs
diff --git a/.github/workflows/test_code.yml b/.github/workflows/test_code.yml
index 37f103be7..ff644d600 100644
--- a/.github/workflows/test_code.yml
+++ b/.github/workflows/test_code.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.12"]
         experimental: [false]
         include:
           - python-version: "3.12"
diff --git a/.github/workflows/test_selenium.yml b/.github/workflows/test_selenium.yml
index e0ec1efdb..6aa70fe87 100644
--- a/.github/workflows/test_selenium.yml
+++ b/.github/workflows/test_selenium.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.8", "3.12" ]
+        python-version: [ "3.9", "3.12" ]
       fail-fast: false
 
     steps:
diff --git a/requirements-dev.txt b/requirements-dev.txt
index ae76a9351..f35857e80 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,6 +2,7 @@ altair>=5.0.0
 cartopy
 check-manifest
 descartes
+fiona
 flake8
 flake8-builtins
 flake8-comprehensions
@@ -10,7 +11,7 @@ flake8-mutable
 flake8-nb>=0.2.5
 geodatasets
 geographiclib
-geopandas
+geopandas>=1
 gpxpy
 ipykernel
 jenkspy