diff --git a/tox.ini b/tox.ini
index 2d64950..f7d5347 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,9 @@ commands = {posargs}
 # This env is invoked in the periodic pipeline and is therefore responsible to
 # build all relevant docs at once.
 [testenv:docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+  -r{toxinidir}/doc/requirements.txt
+  -c https://raw.githubusercontent.com/opentelekomcloud-docs/docs-constraints/main/constraints.txt
 allowlist_externals =
   mkdir
   cp
@@ -36,13 +38,13 @@ commands =
   sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
   {[testenv:api-ref]commands}
   {[testenv:json-api-ref]commands}
-  {[testenv:best-practice]commands}
-  {[testenv:json-best-practice]commands}
   {[testenv:umn]commands}
   {[testenv:json-umn]commands}
+  {[testenv:best-practice]commands}
+  {[testenv:json-best-practice]commands}
 
 [testenv:docs-pdf]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -52,13 +54,13 @@ allowlist_externals =
 commands =
   mkdir -p doc/build/pdf
   {[testenv:api-ref-pdf-docs]commands}
-  {[testenv:best-practice-pdf-docs]commands}
   {[testenv:umn-pdf-docs]commands}
+  {[testenv:best-practice-pdf-docs]commands}
 
 
 # HTML version
 [testenv:api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -69,7 +71,7 @@ commands =
 
 # Json version (for search)
 [testenv:json-api-ref]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -84,7 +86,7 @@ commands =
 
 # PDF version
 [testenv:api-ref-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -101,50 +103,9 @@ commands =
   cp api-ref/build/pdf/wafd-api-ref.pdf doc/build/pdf/
 
 
-# HTML version
-[testenv:best-practice]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  cp
-  mkdir
-commands =
-  sphinx-build -W --keep-going -b html doc/best-practice/source doc/build/html/best-practice
-
-# Json version (for search)
-[testenv:json-best-practice]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  cp
-  mkdir
-  sh
-commands =
-  sphinx-build -W --keep-going -b json doc/best-practice/source doc/build/json/best-practice
-  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
-  # in tox
-  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
-
-# PDF version
-[testenv:best-practice-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
-allowlist_externals =
-  rm
-  mkdir
-  make
-  bash
-  cp
-commands =
-  rm -rf doc/best-practice/build/pdf
-  sphinx-build -W --keep-going -b latex doc/best-practice/source doc/best-practice/build/pdf/
-  bash -c "for f in doc/best-practice/build/pdf/*.gif; do convert $f $\{f/%gif/png\}; done || true"
-  bash -c "for f in doc/best-practice/build/pdf/*.tex; do sed -iorig 's/\.gif//g' $f; done"
-  make -C doc/best-practice/build/pdf
-  mkdir -p doc/build/pdf
-  cp doc/best-practice/build/pdf/wafd-best-practice.pdf doc/build/pdf/
-
-
 # HTML version
 [testenv:umn]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -155,7 +116,7 @@ commands =
 
 # Json version (for search)
 [testenv:json-umn]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   cp
   mkdir
@@ -170,7 +131,7 @@ commands =
 
 # PDF version
 [testenv:umn-pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 allowlist_externals =
   rm
   mkdir
@@ -187,6 +148,47 @@ commands =
   cp umn/build/pdf/wafd-umn.pdf doc/build/pdf/
 
 
+# HTML version
+[testenv:best-practice]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  cp
+  mkdir
+commands =
+  sphinx-build -W --keep-going -b html doc/best-practice/source doc/build/html/best-practice
+
+# Json version (for search)
+[testenv:json-best-practice]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  cp
+  mkdir
+  sh
+commands =
+  sphinx-build -W --keep-going -b json doc/best-practice/source doc/build/json/best-practice
+  # Drop data useless for the search - wrap it also with sh/xargs due to bugs
+  # in tox
+  sh -c "find doc/build/json -type d -and '(' -name '_images' -or -name '_static' -or -name '_sources' ')' -print0 | xargs -0 rm -rf"
+
+# PDF version
+[testenv:best-practice-pdf-docs]
+deps = {[testenv:docs]deps}
+allowlist_externals =
+  rm
+  mkdir
+  make
+  bash
+  cp
+commands =
+  rm -rf doc/best-practice/build/pdf
+  sphinx-build -W --keep-going -b latex doc/best-practice/source doc/best-practice/build/pdf/
+  bash -c "for f in doc/best-practice/build/pdf/*.gif; do convert $f $\{f/%gif/png\}; done || true"
+  bash -c "for f in doc/best-practice/build/pdf/*.tex; do sed -iorig 's/\.gif//g' $f; done"
+  make -C doc/best-practice/build/pdf
+  mkdir -p doc/build/pdf
+  cp doc/best-practice/build/pdf/wafd-best-practice.pdf doc/build/pdf/
+
+
 
 [doc8]
 ignore = D001