diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f22524a..4d9adcf 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,10 +17,10 @@ jobs:
           - ubuntu-latest
           - macos-latest
         ruby:
-          - 2.5
-          - 2.6
-          - 2.7
-          - 3.0
+          - '2.5'
+          - '2.6'
+          - '2.7'
+          - '3.0'
           - jruby
         gcc:
           - 7
diff --git a/.gitmodules b/.gitmodules
index 290149b..ed18e41 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "releaseops"]
 	path = releaseops
-	url = git://github.com/slyphon/releaseops.git
+	url = https://github.com/zk-ruby/releaseops.git