diff --git a/docker/ubuntu-2004-builder.Dockerfile b/docker/ubuntu-2004-builder.Dockerfile
index 88adaf2..667ff4a 100644
--- a/docker/ubuntu-2004-builder.Dockerfile
+++ b/docker/ubuntu-2004-builder.Dockerfile
@@ -126,6 +126,7 @@ RUN cd /root \
         mdbook              \
         mdbook-linkcheck    \
         mdbook-mermaid      \
+        mdbook-pagetoc      \
         sccache             \
         wasm-pack           \
     && chmod -R 777 $RUSTUP_HOME \
diff --git a/docker/ubuntu-2204-builder.Dockerfile b/docker/ubuntu-2204-builder.Dockerfile
index a64d9d9..1336086 100644
--- a/docker/ubuntu-2204-builder.Dockerfile
+++ b/docker/ubuntu-2204-builder.Dockerfile
@@ -84,6 +84,7 @@ RUN cd /root \
         mdbook              \
         mdbook-linkcheck    \
         mdbook-mermaid      \
+        mdbook-pagetoc      \
         sccache             \
         wasm-pack           \
     && chmod -R 777 $RUSTUP_HOME \