diff --git a/.readthedocs.yml b/.readthedocs.yml
index b796095..f1d8270 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,11 +6,3 @@ build:
 sphinx:
   configuration: documentation/source/conf.py
   fail_on_warning: true
-
-python:
-  version: 3.7
-  install:
-  - method: pip
-    path: .
-    extra_requirements:
-      - docs
diff --git a/.travis.yml b/.travis.yml
index 1ce50ed..11d53f0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,10 @@
 language: python
 
+addons:
+  apt:
+    packages:
+      - libsodium-dev
+
 matrix:
   include:
     - python: 3.6
diff --git a/documentation/source/conf.py b/documentation/source/conf.py
index 362ac8f..b468f64 100644
--- a/documentation/source/conf.py
+++ b/documentation/source/conf.py
@@ -6,3 +6,4 @@ master_doc = 'index'
 project = 'hypercore-crypto'
 templates_path = ['_templates']
 extensions = ['sphinx.ext.autodoc', 'sphinx_autodoc_typehints']
+autodoc_mock_imports = ['pysodium']  # no libsodium in the RTD environment
diff --git a/tox.ini b/tox.ini
index 96bcc0f..c72adcf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,7 +56,7 @@ commands =
 
 [testenv:docs]
 description = build the documentation
-skip_install=True
+skipdist = True
 extras = docs
 commands = 
   python -m setup build_sphinx