diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3278673bf..98b207ae5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,11 @@ jobs:
       fail-fast: false
       matrix:
         ruby: [ '3.1', '3.2', '3.3', '3.4', '4.0' ]
-        os: [ ubuntu-22.04 ]
+        os: [ ubuntu-22.04, ubuntu-24.04, ubuntu-26.04 ]
+        exclude:
+          - ruby: '3.1'
+            os: ubuntu-26.04
+
     runs-on: ${{ matrix.os }}
 
     name: Ruby ${{ matrix.ruby }} on ${{ matrix.os }}
@@ -51,7 +55,7 @@ jobs:
     - name: Install Linux packages
       run: |
         sudo apt update
-        sudo apt install -y cmake libssh2-1-dev openssh-client openssh-server
+        sudo apt install -y cmake libssh2-1-dev openssh-client openssh-server ruby-dev libgit2-dev pkg-config libjitterentropy3-dev
     - name: Set up Ruby on Linux
       uses: ruby/setup-ruby@v1
       with:
diff --git a/script/travisbuild b/script/travisbuild
index dcdc64d41..c4116ce53 100755
--- a/script/travisbuild
+++ b/script/travisbuild
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -ex