diff --git a/.ci/test-matrix.yml b/.ci/test-matrix.yml
index 9e6a77b..1d2f2bc 100755
--- a/.ci/test-matrix.yml
+++ b/.ci/test-matrix.yml
@@ -1,18 +1,18 @@
 ---
 
 ELASTICSEARCH_VERSION:
-  - 8.1.0-SNAPSHOT
-  - 8.0.0-SNAPSHOT
+  - '8.1.0-SNAPSHOT'
+  - '8.0.0-SNAPSHOT'
 
 PANDAS_VERSION:
-  - 1.2.0
-  - 1.3.0
+  - '1.2.0'
+  - '1.3.0'
 
 PYTHON_VERSION:
-  - 3.10
-  - 3.9
-  - 3.8
-  - 3.7
+  - '3.10'
+  - '3.9'
+  - '3.8'
+  - '3.7'
 
 TEST_SUITE:
   - xpack