diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 38d2c3a..10cc441 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,7 @@ name: CI
 
 on:
   pull_request:
+  workflow_dispatch:
   push:
     branches:
       - main
@@ -9,6 +10,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     permissions:
diff --git a/.github/workflows/h2-compliance.yml b/.github/workflows/h2-compliance.yml
index ad44e7b..380f737 100644
--- a/.github/workflows/h2-compliance.yml
+++ b/.github/workflows/h2-compliance.yml
@@ -1,7 +1,6 @@
 name: HTTP/2 Compliance
 
 on:
-  pull_request:
   push:
     branches:
       - main
diff --git a/rebar.config b/rebar.config
index a183e87..509b15f 100644
--- a/rebar.config
+++ b/rebar.config
@@ -14,7 +14,7 @@
 ]}.
 
 {project_plugins, [
-    covertool,
+    {covertool, "~> 2.0"},
     {rebar3_lint, "~> 4.2"},
     {erlfmt, "~> 1.7"},
     {rebar3_proper, "~> 0.12"}