diff --git a/.github/workflows/job.test.yml b/.github/workflows/job.test.yml
index b67e048af..3b8fc298b 100644
--- a/.github/workflows/job.test.yml
+++ b/.github/workflows/job.test.yml
@@ -208,16 +208,16 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu', 'macos', 'windows']
-        python: ['3.8', '3.11']
+        python: ['3.9', '3.12']
         include:
-          - python: '3.8'
-            # Node 16 end-of-life: 2023-09-11
-            nodejs: '>=16,<17.0.0.a0'
+          - python: '3.9'
+            # Node 18 end-of-life: 2025-04-30
+            nodejs: '>=18,<19.0.0.a0'
             r: '>=4'
             lab: '>=4.1.0,<5'
           - python: '3.11'
-            # Node 18 end-of-life: 2025-04-30
-            nodejs: '>=18,<19.0.0.a0'
+            # Node 20 end-of-life: 2026-04-30
+            nodejs: '>=20,<21.0.0.a0'
             r: '>=4'
             lab: '>=4.1.0,<5'
 
@@ -239,9 +239,9 @@ jobs:
         with:
           python-version: ${{ matrix.python }}
           environment-file: requirements/github-actions.yml
-          mamba-version: '*'
           channels: conda-forge,nodefaults
           channel-priority: true
+          miniforge-version: latest
 
       - name: List all packages
         run: conda list
@@ -337,18 +337,18 @@ jobs:
       max-parallel: 3
       matrix:
         os: ['ubuntu', 'macos', 'windows']
-        python: ['3.8', '3.11', 'pypy-3.8']
+        python: ['3.9', '3.12', 'pypy-3.9']
         include:
-          - python: '3.8'
+          - python: '3.9'
             dist: 'jupyter*lsp*.whl'
             lab: '>=4.1.0,<5'
-          - python: '3.8'
+          - python: '3.9'
             dist: 'jupyter*lsp*.tar.gz'
             lab: '>=4.1.0,<5'
           - python: '3.11'
             dist: 'jupyter*lsp*.whl'
             lab: '>=4.1.0,<5'
-          - python: 'pypy-3.8'
+          - python: 'pypy-3.9'
             dist: 'jupyter*lsp*.tar.gz'
             lab: '>=4.1.0,<5'
           - os: 'windows'
@@ -392,12 +392,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu]
-        python: ['3.8', '3.11']
+        python: ['3.9', '3.12']
         nodejs: ['20.x']
         include:
-          - python: '3.8'
+          - python: '3.9'
             lab: '>=4.1.0,<5'
-          - python: '3.11'
+          - python: '3.12'
             lab: '>=4.1.0,<5'
     steps:
       - name: Install Python
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 19c718b36..0fbb143fb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -31,9 +31,9 @@ Thank you for all your contributions :heart:
 
 A development environment requires, at a minimum:
 
-- `python >=3.8,<3.13.0a0`
+- `python >=3.9,<3.13.0a0`
 - `jupyterlab >=4.1.0,<5.0.0a0`
-- `nodejs >=18,!=19,!=21,<23`
+- `nodejs >=20,!=21,!=23,<25`
 
 It is recommended to use a virtual environment (e.g. `virtualenv` or `conda env`)
 for development.
diff --git a/README.md b/README.md
index d88e08e35..d1929c2e0 100644
--- a/README.md
+++ b/README.md
@@ -91,7 +91,7 @@ Use context menu on rows in the panel to filter out diagnostics or copy their me
 You will need to have both of the following installed:
 
 - JupyterLab >=4.1.0,<5.0.0a0
-- Python 3.8+
+- Python 3.9+
 
 In addition, if you wish to use javascript, html, markdown or any other NodeJS-based language server you will need to have appropriate NodeJS version installed.
 
diff --git a/binder/environment.yml b/binder/environment.yml
index 27fa04297..3967610a8 100644
--- a/binder/environment.yml
+++ b/binder/environment.yml
@@ -6,12 +6,12 @@ channels:
 
 dependencies:
   # runtime dependencies
-  - python >=3.8,<3.13.0a0
+  - python >=3.9,<3.13.0a0
   - jupyterlab >=4.1.0,<5.0.0a0
   - jupyter_server >=1.1.2
   - notebook >=7
   # build dependencies
-  - nodejs >=18,!=19,!=21,<23
+  - nodejs >=20,!=21,!=23,<25
   # for python language server (and development)
   - flake8 >=3.5
   - pip
diff --git a/versions.py b/versions.py
index 0652c7d2c..f0f3c488e 100644
--- a/versions.py
+++ b/versions.py
@@ -22,4 +22,4 @@
 JUPYTERLAB_NEXT_MAJOR_VERSION = int(JUPYTERLAB_VERSION.split('.')[0]) + 1
 REQUIRED_JUPYTERLAB = f'>={JUPYTERLAB_VERSION},<{JUPYTERLAB_NEXT_MAJOR_VERSION}.0.0a0'
 REQUIRED_JUPYTER_SERVER = '>=1.1.2'
-REQUIRED_PYTHON = '>=3.8,<3.13.0a0'
+REQUIRED_PYTHON = '>=3.9,<3.13.0a0'