diff --git a/.github/workflows/qemu-perf.yml b/.github/workflows/qemu-perf.yml
index d16c42f..4c0dda7 100644
--- a/.github/workflows/qemu-perf.yml
+++ b/.github/workflows/qemu-perf.yml
@@ -16,7 +16,7 @@ jobs:
 
     env:
       DOCKER_BUILDKIT: 1
-      MINOR: 0.20
+      MINOR: '0.20'
 
     strategy:
       fail-fast: false
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 31344c8..a2990cc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,11 +18,11 @@ jobs:
       fail-fast: false
       matrix:
         subver:
-          - 0.16
-          - 0.17
-          - 0.18
-          - 0.19
-          - 0.20
+          - '0.16'
+          - '0.17'
+          - '0.18'
+          - '0.19'
+          - '0.20'
 
         arch:
           - amd64