travis pip version and deps

.travis.yml

@@ -48,8 +48,8 @@ install:
         tar -jxf ${PYPY_VERSION}.tar.bz2
         virtualenv --python="$PYPY_VERSION/bin/pypy3" "$HOME/virtualenvs/$PYPY_VERSION"
         source "$HOME/virtualenvs/$PYPY_VERSION/bin/activate"
-        python -m pip install -U pip
       fi
+  - pip install --upgrade pip
   - pip install -U tox twine wheel codecov
 
 script: tox

tox.ini

@@ -64,8 +64,8 @@ commands =
 [pinned]
 deps =
     -ctests/constraints.txt
-    #using cryptography-2.1.4 to solve dependencies conflict on pip20.2>=
-    cryptography==2.1.4
+    #using cryptography-3.1 to solve dependencies conflict on pip20.2>=
+    cryptography==3.1
     cssselect==0.9.1
     itemadapter==0.1.0
     parsel==1.5.0