diff --git a/.github/workflows/cygwin-51x.yml b/.github/workflows/cygwin-51x.yml
deleted file mode 100644
index 596b58a6..00000000
--- a/.github/workflows/cygwin-51x.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: Cygwin 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: windows-latest
-      platform: cygwin
-      compiler_ref: refs/tags/5.1.1
-      timeout: 240
diff --git a/.github/workflows/linux-51x-32bit.yml b/.github/workflows/linux-51x-32bit.yml
deleted file mode 100644
index 57612517..00000000
--- a/.github/workflows/linux-51x-32bit.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: 32bit 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      compiler_ref: refs/tags/5.1.1
-      options: 32bit
-      timeout: 240
diff --git a/.github/workflows/linux-51x-bytecode.yml b/.github/workflows/linux-51x-bytecode.yml
deleted file mode 100644
index fd77fa38..00000000
--- a/.github/workflows/linux-51x-bytecode.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: Bytecode 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      compiler_ref: refs/tags/5.1.1
-      options: bytecode-only
-      timeout: 240
diff --git a/.github/workflows/linux-51x-debug.yml b/.github/workflows/linux-51x-debug.yml
deleted file mode 100644
index 7d60ed72..00000000
--- a/.github/workflows/linux-51x-debug.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: Linux 5.1 debug
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      compiler_ref: refs/tags/5.1.1
-      dune_profile: 'debug-runtime'
-      runparam: 's=4096,V=1'
-      timeout: 240
diff --git a/.github/workflows/linux-51x-fp.yml b/.github/workflows/linux-51x-fp.yml
deleted file mode 100644
index 2cf1460a..00000000
--- a/.github/workflows/linux-51x-fp.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: FP 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      compiler_ref: refs/tags/5.1.1
-      options: fp
-      timeout: 240
diff --git a/.github/workflows/linux-51x.yml b/.github/workflows/linux-51x.yml
deleted file mode 100644
index 81b9191b..00000000
--- a/.github/workflows/linux-51x.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-name: Linux 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      compiler_ref: refs/tags/5.1.1
diff --git a/.github/workflows/macosx-arm64-51x.yml b/.github/workflows/macosx-arm64-51x.yml
deleted file mode 100644
index f5e33a39..00000000
--- a/.github/workflows/macosx-arm64-51x.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: macOS-ARM64 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: 'macos-14'
-      platform: macos
-      compiler_ref: refs/tags/5.1.1
diff --git a/.github/workflows/macosx-intel-51x.yml b/.github/workflows/macosx-intel-51x.yml
deleted file mode 100644
index c54d72bc..00000000
--- a/.github/workflows/macosx-intel-51x.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-name: macOS-intel 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: 'macos-13'
-      platform: macos
-      compiler_ref: refs/tags/5.1.1
diff --git a/.github/workflows/mingw-51x-bytecode.yml b/.github/workflows/mingw-51x-bytecode.yml
deleted file mode 100644
index fc760189..00000000
--- a/.github/workflows/mingw-51x-bytecode.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-name: MinGW bytecode 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: windows-latest
-      platform: mingw
-      compiler_ref: refs/tags/5.1.1
-      options: bytecode-only
-      timeout: 240
diff --git a/.github/workflows/mingw-51x.yml b/.github/workflows/mingw-51x.yml
deleted file mode 100644
index 78bdc632..00000000
--- a/.github/workflows/mingw-51x.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: MinGW 5.1
-
-on:
-  schedule:
-    # Every Sunday morning, at 2:22 UTC
-    - cron: '22 2 * * 0'
-  workflow_dispatch:
-
-jobs:
-  build:
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: windows-latest
-      platform: mingw
-      compiler_ref: refs/tags/5.1.1
-      timeout: 240
diff --git a/README.md b/README.md
index ab8061fe..f8734d42 100644
--- a/README.md
+++ b/README.md
@@ -3,17 +3,6 @@ Multicore tests
 
 [![OPAM installation](https://github.com/ocaml-multicore/multicoretests/actions/workflows/opam.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/opam.yml)
 
-[![Linux 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x.yml)
-[![macOS-Intel 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-intel-51x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-intel-51x.yml)
-[![macOS-ARM64 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-arm64-51x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-arm64-51x.yml)
-[![Linux 5.1.1-bytecode](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-bytecode.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-bytecode.yml)
-[![Linux 5.1.1-debug](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-debug.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-debug.yml)
-[![Linux 32-bit 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-32bit.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-32bit.yml)
-[![Linux FP 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-fp.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-51x-fp.yml)
-[![MinGW 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-51x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-51x.yml)
-[![MinGW 5.1.1-bytecode](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-51x-bytecode.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/mingw-51x-bytecode.yml)
-[![Cygwin 5.1.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-51x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/cygwin-51x.yml)
-
 [![Linux 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/linux-52x.yml)
 [![macOS-Intel 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-intel-52x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-intel-52x.yml)
 [![macOS-ARM64 5.2.1](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-arm64-52x.yml/badge.svg)](https://github.com/ocaml-multicore/multicoretests/actions/workflows/macosx-arm64-52x.yml)