diff --git a/.github/workflows/build-test-cplusplus.yml b/.github/workflows/build-test-cplusplus.yml
index b85b7f562..79c945338 100644
--- a/.github/workflows/build-test-cplusplus.yml
+++ b/.github/workflows/build-test-cplusplus.yml
@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   coverage:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/.github/workflows/build-test-riscv64.yml b/.github/workflows/build-test-riscv64.yml
index a544071de..420686ee1 100644
--- a/.github/workflows/build-test-riscv64.yml
+++ b/.github/workflows/build-test-riscv64.yml
@@ -24,8 +24,6 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         python:
-          - major-dot-minor: "3.8"
-            matrix: "3.8"
           - major-dot-minor: "3.9"
             matrix: "3.9"
           - major-dot-minor: "3.10"
diff --git a/.github/workflows/doc-html-pdf.yml b/.github/workflows/doc-html-pdf.yml
index e39f8a473..6b0f6d12a 100644
--- a/.github/workflows/doc-html-pdf.yml
+++ b/.github/workflows/doc-html-pdf.yml
@@ -22,7 +22,7 @@ jobs:
     - uses: actions/setup-python@v5
       name: Install Python
       with:
-        python-version: '3.8'
+        python-version: '3.10'
 
     - name: Install python markdown
       shell: bash
diff --git a/.github/workflows/plot-k27-no-bitfield.yaml b/.github/workflows/plot-k27-no-bitfield.yaml
index 0402e3e62..ee3c9f801 100644
--- a/.github/workflows/plot-k27-no-bitfield.yaml
+++ b/.github/workflows/plot-k27-no-bitfield.yaml
@@ -30,7 +30,7 @@ jobs:
     - uses: actions/setup-python@v5
       name: Install Python
       with:
-        python-version: '3.8'
+        python-version: '3.10'
 
     - name: cmake, Plot k=27
       run: |
diff --git a/.github/workflows/plot-k27.yaml b/.github/workflows/plot-k27.yaml
index f53893228..d1d6be582 100644
--- a/.github/workflows/plot-k27.yaml
+++ b/.github/workflows/plot-k27.yaml
@@ -30,7 +30,7 @@ jobs:
     - uses: actions/setup-python@v5
       name: Install Python
       with:
-        python-version: '3.8'
+        python-version: '3.10'
 
     - name: cmake, Plot k=27
       run: |