diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 955fe44..29bffd0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   ci:
-    runs-on: blacksmith-2vcpu-ubuntu-2404-arm
+    runs-on: blacksmith-2vcpu-ubuntu-2604-arm
     timeout-minutes: 10
     steps:
       - uses: useblacksmith/checkout@v1
@@ -39,7 +39,7 @@ jobs:
 
   # engines.node declares the majors tested here; widen both together.
   node-compat:
-    runs-on: blacksmith-2vcpu-ubuntu-2404-arm
+    runs-on: blacksmith-2vcpu-ubuntu-2604-arm
     timeout-minutes: 10
     strategy:
       fail-fast: false
diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index a4fe8ae..4f02b3e 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -15,7 +15,7 @@ concurrency:
 jobs:
   integration:
     name: Testnet smoke (${{ matrix.chain }} / ${{ matrix.network }})
-    runs-on: blacksmith-2vcpu-ubuntu-2404-arm
+    runs-on: blacksmith-2vcpu-ubuntu-2604-arm
     timeout-minutes: 15
     strategy:
       fail-fast: false
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 38672e5..abbacbc 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -25,7 +25,7 @@ concurrency:
 
 jobs:
   publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-26.04
     timeout-minutes: 30
     env:
       RELEASE_TAG: ${{ inputs.tag || github.ref_name }}
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index aba356a..3d3ab4d 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -17,7 +17,7 @@ permissions:
 jobs:
   osv-scan:
     name: Dependency Scan
-    runs-on: blacksmith-2vcpu-ubuntu-2404-arm
+    runs-on: blacksmith-2vcpu-ubuntu-2604-arm
     timeout-minutes: 5
     steps:
       - uses: useblacksmith/checkout@v1