diff --git a/docs/conf.py b/docs/conf.py
index 382159dc..35153b0c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -43,8 +43,7 @@
     'sphinx.ext.viewcode',
     'sphinx.ext.mathjax',
     'sphinxcontrib.napoleon',
-    'sphinx_gallery.gen_gallery',
-    'sphinxcontrib.yt'
+    'sphinx_gallery.gen_gallery'
     ]
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/docs/environment.yml b/docs/environment.yml
index f918cfce..1de0f9cd 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -12,5 +12,4 @@ dependencies:
     - sphinxcontrib-napoleon
     - sphinx_bootstrap_theme
     - networkx
-    - sphinxcontrib.yt
 
diff --git a/examples/01_DataOperations/plot_adjacency.py b/examples/01_DataOperations/plot_adjacency.py
index ea68478b..f77a4ce2 100644
--- a/examples/01_DataOperations/plot_adjacency.py
+++ b/examples/01_DataOperations/plot_adjacency.py
@@ -24,7 +24,7 @@
 
 m1 = block_diag(np.ones((4, 4)), np.zeros((4, 4)), np.zeros((4, 4)))
 m2 = block_diag(np.zeros((4, 4)), np.ones((4, 4)), np.zeros((4, 4)))
-m3 = block_diag(np.zeros((4, 4)), np.zeros((4, 4)), np.ones((4, 4)))*3
+m3 = block_diag(np.zeros((4, 4)), np.zeros((4, 4)), np.ones((4, 4)))
 noisy = (m1*1+m2*2+m3*3) + np.random.randn(12, 12)*.1
 dat = Adjacency(noisy, matrix_type='similarity', labels=['C1']*4 + ['C2']*4 + ['C3']*4)