diff --git a/Makefile b/Makefile
index 82d2fa5..48766f4 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ book: figures
 	jupyter-book build brainhack_book
 
 test: figures
-	jupyter-book build brainhack_book -W --builder linkcheck
+	jupyter-book build brainhack_book --strict --check-links
 
 validate_citation_cff: CITATION.cff
 	cffconvert --validate
diff --git a/data/locations_2021.yaml b/data/locations_2021.yaml
index 3f6ca37..128eb56 100755
--- a/data/locations_2021.yaml
+++ b/data/locations_2021.yaml
@@ -43,7 +43,7 @@ events:
     contact:
       - michal-brzus@uiowa.edu
     website:
-    address: University of Iowa, Iowa City,	USA
+    address: University of Iowa, Iowa City, USA
     position:
       lat: 41.66286808308367
       lng: -91.55440847343925
@@ -67,7 +67,7 @@ events:
     contact:
       - dave.oconnor@yale.edu
     website:
-    address: Yale University, New Haven,	USA
+    address: Yale University, New Haven, USA
     position:
       lat: 41.3171463076155
       lng: -72.92204269579824
@@ -81,7 +81,7 @@ events:
     website: https://langsci-edu.github.io/brainhack21
     address:
       Graduate Institute of Linguistics, National Taiwan University,
-      Taipei,	Taiwan
+      Taipei, Taiwan
     position:
       lat: 25.017476595471454
       lng: 121.53975179752602
@@ -93,7 +93,7 @@ events:
     contact:
       - hartma4k@students.uni-marburg.de
     website: https://brainhack-marburg.github.io/
-    address: OSIUM (Open Science Initiative University Marburg), Marburg,	Germany
+    address: OSIUM (Open Science Initiative University Marburg), Marburg, Germany
     position:
       lat: 50.81080790834922
       lng: 8.774228471279875
@@ -132,7 +132,7 @@ events:
     contact:
       - mac.shine@sydney.edu.au
     website:
-    address: The University of Sydney, Sydney,	Australia
+    address: The University of Sydney, Sydney, Australia
     position:
       lat: -33.8883636936788
       lng: 151.1873131074999
@@ -170,7 +170,7 @@ events:
     contact:
       - brainhack.western@gmail.com
     website: https://brainhackwestern.github.io
-    address: Western University, London, Ontario,	Canada
+    address: Western University, London, Ontario, Canada
     position:
       lat: 43.0101
       lng: -81.2736
diff --git a/environment.yml b/environment.yml
deleted file mode 100644
index d2c5da7..0000000
--- a/environment.yml
+++ /dev/null
@@ -1,23 +0,0 @@
-name: brainhack-jb-env
-channels:
-  - default
-  - conda-forge
-dependencies:
-  - python=3.10.*
-  - pip
-  - git
-  - geopandas
-  - ghp-import
-  - jupytext
-  - pandas
-  - pytest
-  - pip:
-    - jupyter-book
-    - osfclient
-    - rich
-    - black
-    - requests
-    - ruamel.yaml
-    - cffconvert
-    - plotly
-    - flake8
diff --git a/requirements.txt b/requirements.txt
index 560d670..d4b440a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,11 +4,11 @@ jupytext
 pandas
 pyshp
 pytest
-jupyter-book
+jupyter-book>=2.0.0
 osfclient
 rich
 requests
 ruamel.yaml
 cffconvert
 plotly
-pre-commit
\ No newline at end of file
+pre-commit