diff --git a/.github/workflows/build-multiarch.yml b/.github/workflows/build-multiarch.yml
index 4fb661f8..971b5e99 100644
--- a/.github/workflows/build-multiarch.yml
+++ b/.github/workflows/build-multiarch.yml
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2.3.5
 
       - name: Docker meta
         id: meta
diff --git a/.github/workflows/generate-toc.yml b/.github/workflows/generate-toc.yml
index 684d9a8d..cc95dbf7 100644
--- a/.github/workflows/generate-toc.yml
+++ b/.github/workflows/generate-toc.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.3.5
       - run: |
           curl https://raw.githubusercontent.com/ekalinin/github-markdown-toc/master/gh-md-toc -o gh-md-toc
           chmod a+x gh-md-toc
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5fddc8cc..cfd228b7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.3.5
 
       - name: Run tests
         run: |
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v2.3.5
 
     - name: Prepare
       id: prep
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 8820d4f4..719067d6 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.3.5
 
       - name: Run tests
         run: |
diff --git a/README.md b/README.md
index ca6e9ec5..c24b8353 100644
--- a/README.md
+++ b/README.md
@@ -572,6 +572,16 @@ Configuration options with defaults:
 - `LIMBO_SCHEMA_FILENAME`=default.schem
 - `LEVEL`="Default;${LIMBO_SCHEMA_FILENAME}"
 
+### Running a Crucible server
+
+A [Crucible](https://github.com/CrucibleMC/Crucible) server can be run by setting `TYPE` to `CRUCIBLE`.
+
+Configuration options with defaults:
+
+- `CRUCIBLE_RELEASE`=latest
+
+Crucible is only available for 1.7.10, so be sure to set `VERSION=1.7.10`.
+
 ## Running a server with a Feed the Beast modpack
 
 > **NOTE** requires one of the Debian based images listed in [the Java versions section](#running-minecraft-server-on-different-java-version).