diff --git a/tools/ci/install_od.sh b/tools/ci/install_od.sh
index 4351e3b6e96..a9873e68315 100644
--- a/tools/ci/install_od.sh
+++ b/tools/ci/install_od.sh
@@ -1,7 +1,22 @@
 #!/bin/bash
 set -eo pipefail
 
-git clone https://github.com/OpenDreamProject/OpenDream.git $HOME/OpenDream
-git -C $HOME/OpenDream submodule update --init --recursive
+if [ -d "$HOME/OpenDream/" ];
+then
+  echo "Using cached OpenDream directory."
+
+  git -C $HOME/OpenDream fetch origin
+  git -C $HOME/OpenDream reset --hard origin/master
+
+  git -C $HOME/OpenDream submodule update --remote
+
+
+else
+  echo "Setting up OpenDream."
+
+  git clone https://github.com/OpenDreamProject/OpenDream.git $HOME/OpenDream
+  git -C $HOME/OpenDream submodule update --init --recursive
+fi
+
 dotnet restore $HOME/OpenDream
 dotnet build $HOME/OpenDream/OpenDream.sln -c Release --property WarningLevel=1