diff --git a/.github/workflows/daily.yml b/.github/workflows/daily.yml
index 33271b384..ca4722e49 100644
--- a/.github/workflows/daily.yml
+++ b/.github/workflows/daily.yml
@@ -14,8 +14,8 @@ jobs:
 
     strategy:
       matrix:
-        line_editor: ["libedit", "readline"]
-        compiler: ["clang", "gcc"]
+        line_editor: [libedit, readline]
+        compiler: [clang, gcc]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 82be72882..c5a470583 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -17,9 +17,9 @@ jobs:
 
     strategy:
       matrix:
-        version: ["2.4.9", "2.5.7", "2.6.5", "2.7.0", "head"]
-        line_editor: ["libedit", "readline"]
-        compiler: ["clang", "gcc"]
+        version: [2.4.9, 2.5.7, 2.6.5, 2.7.0, head]
+        line_editor: [libedit, readline]
+        compiler: [clang, gcc]
 
     steps:
       - uses: actions/checkout@v2