diff --git a/.github/workflows/cache-dependencies.yml b/.github/workflows/cache-dependencies.yml
index d849265cd..08c2ee96d 100644
--- a/.github/workflows/cache-dependencies.yml
+++ b/.github/workflows/cache-dependencies.yml
@@ -17,6 +17,15 @@ jobs:
       run:
         shell: bash -l {0}
 
+    env:
+      MPI: no
+      OMP: no
+      PHDF5: no
+      DAGMC: no
+      EVENT: no
+      VECTFIT: no
+      LIBMESH: no
+
     steps:
       - uses: actions/checkout@v3
 
@@ -42,6 +51,7 @@ jobs:
         with:
           path: |
             /usr/share/miniconda3/envs/saltproc-env
+            ~/openmc_src
             ~/endfb71_hdf5
             ~/.cache/pip
           key: depcache-${{ hashFiles('environment.yml') }}-${{ env.DATE }}-${{ env.CACHE_NUMBER }}
@@ -62,8 +72,19 @@ jobs:
 
       - name: Download OpenMC
         if: steps.dependencies-cache.outputs.cache-hit != 'true'
-        run: |
-          mamba install openmc
+        uses: actions/checkout@v3
+        with: 
+          repository: openmc-dev/openmc
+          path: openmc
+          submodules: recursive
+          
+      - name: Build OpenMC from source if no cache if found
+        if: steps.dependencies-cache.outputs.cache-hit != 'true'
+        run: $GITHUB_WORKSPACE/tools/ci/build-openmc.sh
+
+      - name: Restore OpenMC source build from cache
+        if: steps.dependencies-cache.outputs.cache-hit == 'true'
+        run: $GITHUB_WORKSPACE/tools/ci/restore-openmc.sh
           
       - name: Install SaltProc
         run: pip install .
diff --git a/.github/workflows/test-saltproc.yml b/.github/workflows/test-saltproc.yml
index 0854b8657..446af254f 100644
--- a/.github/workflows/test-saltproc.yml
+++ b/.github/workflows/test-saltproc.yml
@@ -23,6 +23,15 @@ jobs:
       run:
         shell: bash -l {0}
 
+    env:
+      MPI: no
+      OMP: no
+      PHDF5: no
+      DAGMC: no
+      EVENT: no
+      VECTFIT: no
+      LIBMESH: no
+
     steps:
       - uses: actions/checkout@v3
 
@@ -48,6 +57,8 @@ jobs:
         with:
           path: |
             /usr/share/miniconda3/envs/saltproc-env
+            ~/openmc_src
+            ~/mcpl_src
             ~/endfb71_hdf5
             ~/.cache/pip
           key: depcache-${{ hashFiles('environment.yml') }}-${{ env.DATE }}-${{ env.CACHE_NUMBER }}
@@ -68,9 +79,20 @@ jobs:
 
       - name: Download OpenMC
         if: steps.dependencies-cache.outputs.cache-hit != 'true'
-        run: |
-          mamba install openmc
+        uses: actions/checkout@v3
+        with: 
+          repository: openmc-dev/openmc
+          path: openmc
+          submodules: recursive
+
+      - name: Build OpenMC from source if no cache is found
+        if: steps.dependencies-cache.outputs.cache-hit != 'true'
+        run: $GITHUB_WORKSPACE/tools/ci/build-openmc.sh
 
+      - name: Restore OpenMC source build from cache
+        if: steps.dependencies-cache.outputs.cache-hit == 'true'
+        run: $GITHUB_WORKSPACE/tools/ci/restore-openmc.sh
+          
       - name: Install SaltProc
         run:  pip install .
 
diff --git a/tools/ci/build-openmc.sh b/tools/ci/build-openmc.sh
new file mode 100755
index 000000000..c042e2594
--- /dev/null
+++ b/tools/ci/build-openmc.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+set -ex
+
+# Build openmc
+cd openmc
+./tools/ci/gha-install-mcpl.sh
+python tools/ci/gha-install.py
+
+# Create the caching folder
+DIRS=(openmc_src mcpl_src)
+for DIR in ${DIRS[@]}; do
+    mkdir $DIR
+    mkdir $DIR/bin
+    mkdir $DIR/lib
+    mkdir $DIR/share
+    mkdir $DIR/include
+done
+
+# Copy libraries to caching folder
+cp /usr/local/bin/openmc openmc_src/bin/.
+cp /usr/local/lib/libopenmc.so openmc_src/lib/.
+cp -r /usr/local/lib/cmake openmc_src/lib/.
+cp /usr/local/lib/libpugixml.a openmc_src/lib/.
+cp -r /usr/local/lib/pkgconfig openmc_src/lib/.
+#cp -r /usr/local/share/openmc openmc_src/share/.
+#cp -r /usr/local/share/man openmc_src/share/.
+cp -r /usr/local/include/openmc openmc_src/include/.
+cp /usr/local/include/pugiconfig.hpp openmc_src/include/.
+cp /usr/local/include/pugixml.hpp openmc_src/include/.
+INCLUDES=(fmt xtl xtensor gsl gsl-lite openmc)
+for I in ${INCLUDES[@]}; do
+    cp -r /usr/local/include/$I openmc_src/include/.
+done
+
+# MCPL stuff
+cp /usr/local/lib/libmcpl.so mcpl_src/lib/.
+cp /usr/local/include/mcpl.h mcpl_src/include/.
+cp /usr/local/lib/libsswmcpl.so mcpl_src/lib/.
+cp /usr/local/lib/libphitsmcpl.so mcpl_src/lib/.
+cp -r /usr/local/share/MCPL mcpl_src/share/.
+
+MCPL_BINARIES=(pymcpltool mcpl-config mcpl2ssw ssw2mcpl mcpl2phits phits2mcpl mcpltool)
+for BINARY in ${MCPL_BINARIES[@]}; do
+    cp /usr/local/bin/$BINARY mcpl_src/bin/.
+done
+
+
+# Move the caching folders to $HOME
+mv openmc_src $HOME/openmc_src
+mv mcpl_src $HOME/mcpl_src
+
+# Install the OpenMC python API
+pip install .
+cd ../
diff --git a/tools/ci/restore-openmc.sh b/tools/ci/restore-openmc.sh
new file mode 100755
index 000000000..35fb60ab1
--- /dev/null
+++ b/tools/ci/restore-openmc.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+set -ex
+
+# Move cached OpenMC libaries to PATH
+sudo mv $HOME/openmc_src/bin/openmc /usr/local/bin/openmc
+OPENMC_LIBS=(libopenmc.so cmake libpugixml.a pkgconfig)
+for LIB in ${OPENMC_LIBS[@]}; do
+    sudo mv $HOME/openmc_src/lib/$LIB /usr/local/lib/.
+done
+
+sudo mv $HOME/openmc_src/lib/ /usr/local/lib/
+#sudo mv $HOME/openmc_src/share/openmc /usr/local/share/openmc
+#sudo mv $HOME/openmc_src/share/man /usr/local/share/man
+INCLUDES=(fmt xtl xtensor gsl gsl-lite openmc pugixml.hpp pugiconfig.hpp)
+for I in ${INCLUDES[@]}; do
+    sudo mv $HOME/openmc_src/include/$I /usr/local/include/$I
+done
+
+# Move MCPL stuff
+MCPL_BINARIES=(pymcpltool mcpl-config mcpltool mcpl2ssw ssw2mcpl mcpl2phits phits2mcpl)
+for BINARY in ${MCPL_BINARIES[@]}; do
+    sudo mv $HOME/mcpl_src/bin/$BINARY /usr/local/bin/.
+done
+
+MCPL_LIBS=(libsswmcpl.so libphitsmcpl.so libmcpl.so)
+for LIB in ${MCPL_LIBS[@]}; do
+    sudo mv $HOME/mcpl_src/lib/$LIB /usr/local/lib/.
+done
+sudo mv $HOME/mcpl_src/include/mcpl.h /usr/local/include/.
+sudo mv $HOME/mcpl_src/share/MCPL /usr/local/share/.