diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5f5ba154..973e9ee3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,14 +18,18 @@ jobs:
       fail-fast: false
       matrix:
         os:
+        - ubuntu-latest
+        - ubuntu-24.04
         - ubuntu-20.04
-        - ubuntu-18.04
         ruby:
+        - 3.3
+        - 3.2
+        - 3.1
         - "3.0"
         - 2.7
         - 2.6
         include:
-        - { os: ubuntu-20.04 , ruby: head }
+        - { os: ubuntu-latest , ruby: debug }
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/nmatrix.yml b/.github/workflows/nmatrix.yml
index f85a374a..85f3bb28 100644
--- a/.github/workflows/nmatrix.yml
+++ b/.github/workflows/nmatrix.yml
@@ -18,6 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
+        - ubuntu-latest
         - ubuntu-20.04
         ruby:
         - 2.7
diff --git a/.github/workflows/pycall.yml b/.github/workflows/pycall.yml
index b35e84dc..67bcd893 100644
--- a/.github/workflows/pycall.yml
+++ b/.github/workflows/pycall.yml
@@ -19,19 +19,19 @@ jobs:
       fail-fast: false
       matrix:
         os:
+        - ubuntu-latest
+        - ubuntu-24.04
         - ubuntu-20.04
-        - ubuntu-18.04
         ruby:
-        - "3.0"
-        - 2.7
-        - 2.6
+        - 3.3
+        - 3.2
+        - 3.1
         python:
         - 3.x
-        - 2.x
         python_architecture:
         - x64
         include:
-        - { os: ubuntu-20.04 , ruby: head , python: 3.x , python_architecture: x64 }
+        - { os: ubuntu-latest , ruby: debug , python: 3.x , python_architecture: x64 }
 
     steps:
     - uses: actions/checkout@v2