diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 75f5828ef4..3a12d19428 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -11,8 +11,9 @@ defaults:
     shell: bash -ex {0}
 
 concurrency:
-   group: ${{ github.workflow }}-${{ github.ref }}
-   cancel-in-progress: true
+  # Allow only one workflow per any non-`main` branch.
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref == 'refs/heads/main' && github.sha || 'anysha' }}
+  cancel-in-progress: true
 
 env:
   RUST_BACKTRACE: 1
diff --git a/.github/workflows/codestyle.yml b/.github/workflows/codestyle.yml
index 2b8a01e94e..345c1d5397 100644
--- a/.github/workflows/codestyle.yml
+++ b/.github/workflows/codestyle.yml
@@ -11,8 +11,9 @@ defaults:
     shell: bash -ex {0}
 
 concurrency:
-   group: ${{ github.workflow }}-${{ github.ref }}
-   cancel-in-progress: true
+  # Allow only one workflow per any non-`main` branch.
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref == 'refs/heads/main' && github.sha || 'anysha' }}
+  cancel-in-progress: true
 
 env:
   RUST_BACKTRACE: 1
diff --git a/.github/workflows/pg_clients.yml b/.github/workflows/pg_clients.yml
index fe4dbea8ac..4ff31ac508 100644
--- a/.github/workflows/pg_clients.yml
+++ b/.github/workflows/pg_clients.yml
@@ -13,8 +13,9 @@ on:
   workflow_dispatch:
 
 concurrency:
-   group: ${{ github.workflow }}-${{ github.ref }}
-   cancel-in-progress: true
+  # Allow only one workflow per any non-`main` branch.
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref == 'refs/heads/main' && github.sha || 'anysha' }}
+  cancel-in-progress: true
 
 jobs:
   test-postgres-client-libs: