diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index e26aaa12e..104c06a25 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -13,7 +13,8 @@ on:
 
 jobs:
   coverage:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
+    # ubuntu-latest = ubuntu-24.04 does not include mono (2025-08-01)
 
     steps:
     - name: Checkout repository
diff --git a/.github/workflows/daily_build.yml b/.github/workflows/daily_build.yml
index a1486f0a5..1d2b24ea5 100644
--- a/.github/workflows/daily_build.yml
+++ b/.github/workflows/daily_build.yml
@@ -7,7 +7,8 @@ on:
 
 jobs:
   test_and_publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
+    # ubuntu-latest = ubuntu-24.04 does not include mono (2025-08-01)
 
     steps:
     - name: Checkout repository
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 9ba78bd93..db42487ed 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -7,7 +7,8 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
+    # ubuntu-latest = ubuntu-24.04 does not include mono (2025-08-01)
 
     steps:
     - name: Checkout main
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9a0e3ae65..f9bb5b340 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,7 +12,8 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
+    # ubuntu-latest = ubuntu-24.04 does not include mono (2025-08-01)
 
     steps:
     - name: Checkout repository