diff --git a/.github/workflows/Ubuntu-release.yml b/.github/workflows/Ubuntu-release.yml
index 21fda75..3035b1e 100644
--- a/.github/workflows/Ubuntu-release.yml
+++ b/.github/workflows/Ubuntu-release.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04]
+        operating-system: [ubuntu-20.04, ubuntu-22.04]
         php-versions: ['7.4', '8.0', '8.1', '8.2']
         threads: [ts, nts]
     steps:
diff --git a/.github/workflows/Ubuntu.yml b/.github/workflows/Ubuntu.yml
index eaebba2..9af8652 100644
--- a/.github/workflows/Ubuntu.yml
+++ b/.github/workflows/Ubuntu.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        operating-system: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04]
+        operating-system: [ubuntu-20.04, ubuntu-22.04]
         php-versions: ['7.4', '8.0', '8.1', '8.2']
         threads: [ts, nts]
     steps: