diff --git a/environment.yml b/environment.yml
index 76faa295..e55f9368 100644
--- a/environment.yml
+++ b/environment.yml
@@ -7,7 +7,7 @@ dependencies:
   - pip
   - pip:
     - jupyter-book==1.0.4post1
-    - quantecon-book-theme==0.9.2
+    - quantecon-book-theme==0.9.3
     - sphinx-tojupyter==0.3.1
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==1.0.1
diff --git a/lectures/amss.md b/lectures/amss.md
index e9208ee4..ad46b191 100644
--- a/lectures/amss.md
+++ b/lectures/amss.md
@@ -47,7 +47,7 @@ Now let's define numba-compatible interpolation functions for this lecture.
 We will soon use the following interpolation functions to interpolate the value function and the policy functions
 
 ```{code-cell} ipython
-:tags: [collapse-40]
+:tags: [collapse-20]
 
 @njit
 def get_grid_nodes(grid):
@@ -745,7 +745,7 @@ assets, returning any excess revenues to the household as non-negative lump-sum
 The recursive formulation is implemented as follows
 
 ```{code-cell} python3
-:tags: [collapse-30]
+:tags: [collapse-20]
 :load: _static/lecture_specific/amss/recursive_allocation.py
 ```