diff --git a/.travis.yml b/.travis.yml
index 4006e760..f2ea0eee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,10 +10,13 @@ matrix:
     dist: xenial
     sudo: false
     python: '2.7'
-  - os: linux
-    dist: xenial
-    sudo: false
-    python: '3.2'
+# Something is broken about pysnmp->pysnmpcrypto->cryptography.
+# Somehow pysnmpcrypto chooses cryptography while it should
+# pick pycryptodomex
+#  - os: linux
+#    dist: xenial
+#    sudo: false
+#    python: '3.2'
   - os: linux
     dist: xenial
     sudo: false
@@ -38,17 +41,16 @@ matrix:
     dist: xenial
     sudo: false
     python: 'nightly'
-#  - os: linux
-#    dist: xenial
-#    sudo: false
-#    python: 'pypy'
-#  - os: linux
-#    dist: xenial
-#    sudo: false
-#    python: 'pypy3'
+  - os: linux
+    dist: xenial
+    sudo: false
+    python: 'pypy'
+  - os: linux
+    dist: xenial
+    sudo: false
+    python: 'pypy3'
 install:
-  - pip install -r requirements.txt -r devel-requirements.txt
+  - pip install -r requirements.txt -r devel-requirements.txt -r extra-requirements.txt
   - pip install -e .
-  - pip install pysnmp-mibs
 script:
   - travis_wait 20 sh runtests.sh
diff --git a/devel-requirements.txt b/devel-requirements.txt
index d03c9630..093a878c 100644
--- a/devel-requirements.txt
+++ b/devel-requirements.txt
@@ -1,10 +1,2 @@
 Sphinx <= 1.6; python_version < '2.7'
 Sphinx > 1.6; python_version >= '2.7'
-trollius; python_version < '3.0'
-twisted < 15.4; python_version < '2.7'
-twisted; python_version == '2.7'
-twisted < 17.9; python_version == '3.0'
-twisted < 17.9; python_version == '3.1'
-twisted < 17.9; python_version == '3.2'
-twisted <= 17.9; python_version == '3.3'
-twisted; python_version >= '3.4'
diff --git a/extra-requirements.txt b/extra-requirements.txt
new file mode 100644
index 00000000..0c8d2f2b
--- /dev/null
+++ b/extra-requirements.txt
@@ -0,0 +1,9 @@
+pysnmpcrypto
+trollius; python_version < '3.0'
+twisted < 15.4; python_version < '2.7'
+twisted; python_version == '2.7'
+twisted < 17.9; python_version == '3.0'
+twisted < 17.9; python_version == '3.1'
+twisted < 17.9; python_version == '3.2'
+twisted <= 17.9; python_version == '3.3'
+twisted; python_version >= '3.4'