diff --git a/.github/workflows/docs-and-testcov.yml b/.github/workflows/docs-and-testcov.yml
index 2ef211b..15bebea 100644
--- a/.github/workflows/docs-and-testcov.yml
+++ b/.github/workflows/docs-and-testcov.yml
@@ -170,6 +170,7 @@ jobs:
 
       - name: Build user guide
         run: |
+          cargo binstall mdbook -q
           cd docs
           ./build.sh
           cd ..
diff --git a/.github/workflows/run-unit-tests.yml b/.github/workflows/run-unit-tests.yml
index 6ddaade..b62f02a 100644
--- a/.github/workflows/run-unit-tests.yml
+++ b/.github/workflows/run-unit-tests.yml
@@ -81,6 +81,7 @@ jobs:
 
       - name: Test build user guide
         run: |
+          cargo binstall mdbook -q
           cd docs
           ./build.sh
           cd ..