diff --git a/.travis.yml b/.travis.yml
index e4dab4eb53afb..4e25380a7d941 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,33 +34,32 @@ matrix:
     - os: osx
       language: generic
       env:
-        - JOB="3.5_OSX" TEST_ARGS="--skip-slow --skip-network"
+        - JOB="3.5, OSX" ENV_FILE="ci/travis-35-osx.yaml" TEST_ARGS="--skip-slow --skip-network"
     - dist: trusty
       env:
-        - JOB="2.7_LOCALE" LOCALE_OVERRIDE="zh_CN.UTF-8" SLOW=true
+        - JOB="2.7, locale, slow, old NumPy" ENV_FILE="ci/travis-27-locale.yaml" LOCALE_OVERRIDE="zh_CN.UTF-8" SLOW=true
       addons:
         apt:
           packages:
           - language-pack-zh-hans
     - dist: trusty
       env:
-        - JOB="2.7" TEST_ARGS="--skip-slow" LINT=true
+        - JOB="2.7, lint" ENV_FILE="ci/travis-27.yaml" TEST_ARGS="--skip-slow" LINT=true
       addons:
         apt:
           packages:
           - python-gtk2
-    # In allow_failures
     - dist: trusty
       env:
-        - JOB="3.6" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate" CONDA_FORGE=true COVERAGE=true
+        - JOB="3.6, coverage" ENV_FILE="ci/travis-36.yaml" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate" COVERAGE=true
     # In allow_failures
     - dist: trusty
       env:
-        - JOB="3.6_SLOW" SLOW=true
+        - JOB="3.6, slow" ENV_FILE="ci/travis-36-slow.yaml" SLOW=true
     # In allow_failures
     - dist: trusty
       env:
-        - JOB="3.6_NUMPY_DEV" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate"
+        - JOB="3.6, NumPy dev" ENV_FILE="ci/travis-36-numpydev.yaml" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate"
       addons:
         apt:
           packages:
@@ -68,21 +67,21 @@ matrix:
     # In allow_failures
     - dist: trusty
       env:
-        - JOB="3.6_DOC" DOC=true
+        - JOB="3.6, doc" ENV_FILE="ci/travis-36-doc.yaml" DOC=true
     allow_failures:
       - dist: trusty
         env:
-          - JOB="3.6_SLOW" SLOW=true
+          - JOB="3.6, slow" ENV_FILE="ci/travis-36-slow.yaml" SLOW=true
       - dist: trusty
         env:
-          - JOB="3.6_NUMPY_DEV" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate"
+          - JOB="3.6, NumPy dev" ENV_FILE="ci/travis-36-numpydev.yaml" TEST_ARGS="--skip-slow --skip-network" PANDAS_TESTING_MODE="deprecate"
         addons:
           apt:
             packages:
             - xsel
       - dist: trusty
         env:
-          - JOB="3.6_DOC" DOC=true
+          - JOB="3.6, doc" ENV_FILE="ci/travis-36-doc.yaml" DOC=true
 
 before_install:
   - echo "before_install"
diff --git a/appveyor.yml b/appveyor.yml
index ba001208864a8..f70fc829ec971 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -73,19 +73,12 @@ install:
   - cmd: conda info -a
 
   # create our env
-  - cmd: conda create -n pandas python=%PYTHON_VERSION% cython pytest>=3.1.0 pytest-xdist
+  - cmd: conda env create -q -n pandas --file=ci\appveyor-%CONDA_PY%.yaml
   - cmd: activate pandas
-  - cmd: pip install moto
-  - SET REQ=ci\requirements-%PYTHON_VERSION%_WIN.run
-  - cmd: echo "installing requirements from %REQ%"
-  - cmd: conda install -n pandas --file=%REQ%
   - cmd: conda list -n pandas
-  - cmd: echo "installing requirements from %REQ% - done"
-
-  # add some pip only reqs to the env
-  - SET REQ=ci\requirements-%PYTHON_VERSION%_WIN.pip
-  - cmd: echo "installing requirements from %REQ%"
-  - cmd: pip install -Ur %REQ%
+  # uninstall pandas if it's present
+  - cmd: conda remove pandas -y --force & exit 0
+  - cmd: pip uninstall -y pandas & exit 0
 
   # build em using the local source checkout in the correct windows env
   - cmd: '%CMD_IN_ENV% python setup.py build_ext --inplace'
diff --git a/ci/appveyor-27.yaml b/ci/appveyor-27.yaml
new file mode 100644
index 0000000000000..84107c605b14f
--- /dev/null
+++ b/ci/appveyor-27.yaml
@@ -0,0 +1,29 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - beautifulsoup4
+  - bottleneck
+  - dateutil
+  - html5lib
+  - jinja2=2.8
+  - lxml
+  - matplotlib
+  - numexpr
+  - numpy=1.10*
+  - openpyxl
+  - pytables==3.2.2
+  - python=2.7.*
+  - pytz
+  - s3fs
+  - scipy
+  - sqlalchemy
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - cython
+  - pytest
+  - pytest-xdist
+  - moto
diff --git a/ci/appveyor-36.yaml b/ci/appveyor-36.yaml
new file mode 100644
index 0000000000000..5e370de39958a
--- /dev/null
+++ b/ci/appveyor-36.yaml
@@ -0,0 +1,27 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - blosc
+  - bottleneck
+  - fastparquet
+  - feather-format
+  - matplotlib
+  - numexpr
+  - numpy=1.13*
+  - openpyxl
+  - pyarrow
+  - pytables
+  - python-dateutil
+  - python=3.6.*
+  - pytz
+  - scipy
+  - thrift=0.10*
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - cython
+  - pytest
+  - pytest-xdist
diff --git a/ci/circle-27-compat.yaml b/ci/circle-27-compat.yaml
new file mode 100644
index 0000000000000..81a48d4edf11c
--- /dev/null
+++ b/ci/circle-27-compat.yaml
@@ -0,0 +1,28 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - bottleneck=1.0.0
+  - cython=0.24
+  - jinja2=2.8
+  - numexpr=2.4.4 # we test that we correctly don't use an unsupported numexpr
+  - numpy=1.9.2
+  - openpyxl
+  - psycopg2
+  - pytables=3.2.2
+  - python-dateutil=2.5.0
+  - python=2.7*
+  - pytz=2013b
+  - scipy=0.14.0
+  - sqlalchemy=0.7.8
+  - xlrd=0.9.2
+  - xlsxwriter=0.5.2
+  - xlwt=0.7.5
+  # universal
+  - pytest
+  - pytest-xdist
+  - pip:
+    - html5lib==1.0b2
+    - beautifulsoup4==4.2.1
+    - pymysql==0.6.0
diff --git a/ci/circle-35-ascii.yaml b/ci/circle-35-ascii.yaml
new file mode 100644
index 0000000000000..602c414b49bb2
--- /dev/null
+++ b/ci/circle-35-ascii.yaml
@@ -0,0 +1,13 @@
+name: pandas
+channels:
+  - defaults
+dependencies:
+  - cython
+  - nomkl
+  - numpy
+  - python-dateutil
+  - python=3.5*
+  - pytz
+  # universal
+  - pytest
+  - pytest-xdist
diff --git a/ci/circle-36-locale.yaml b/ci/circle-36-locale.yaml
new file mode 100644
index 0000000000000..cc852c1e2aeeb
--- /dev/null
+++ b/ci/circle-36-locale.yaml
@@ -0,0 +1,33 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - beautifulsoup4
+  - cython
+  - html5lib
+  - ipython
+  - jinja2
+  - lxml
+  - matplotlib
+  - nomkl
+  - numexpr
+  - numpy
+  - openpyxl
+  - psycopg2
+  - pymysql
+  - pytables
+  - python-dateutil
+  - python=3.6*
+  - pytz
+  - s3fs
+  - scipy
+  - sqlalchemy
+  - xarray
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - pytest
+  - pytest-xdist
+  - moto
diff --git a/ci/circle-36-locale_slow.yaml b/ci/circle-36-locale_slow.yaml
new file mode 100644
index 0000000000000..cc852c1e2aeeb
--- /dev/null
+++ b/ci/circle-36-locale_slow.yaml
@@ -0,0 +1,33 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - beautifulsoup4
+  - cython
+  - html5lib
+  - ipython
+  - jinja2
+  - lxml
+  - matplotlib
+  - nomkl
+  - numexpr
+  - numpy
+  - openpyxl
+  - psycopg2
+  - pymysql
+  - pytables
+  - python-dateutil
+  - python=3.6*
+  - pytz
+  - s3fs
+  - scipy
+  - sqlalchemy
+  - xarray
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - pytest
+  - pytest-xdist
+  - moto
diff --git a/ci/install_circle.sh b/ci/install_circle.sh
index fd79f907625e9..5ffff84c88488 100755
--- a/ci/install_circle.sh
+++ b/ci/install_circle.sh
@@ -46,10 +46,6 @@ echo "[environmental variable file]"
 cat $ENVS_FILE
 source $ENVS_FILE
 
-export REQ_BUILD=ci/requirements-${JOB}.build
-export REQ_RUN=ci/requirements-${JOB}.run
-export REQ_PIP=ci/requirements-${JOB}.pip
-
 # edit the locale override if needed
 if [ -n "$LOCALE_OVERRIDE" ]; then
     echo "[Adding locale to the first line of pandas/__init__.py]"
@@ -62,25 +58,23 @@ if [ -n "$LOCALE_OVERRIDE" ]; then
 fi
 
 # create envbuild deps
-echo "[create env: ${REQ_BUILD}]"
-time conda create -n pandas -q --file=${REQ_BUILD} || exit 1
-time conda install -n pandas pytest>=3.1.0 || exit 1
+echo "[create env]"
+time conda env create -q -n pandas --file="${ENV_FILE}" || exit 1
 
 source activate pandas
-time pip install moto || exit 1
+
+# remove any installed pandas package
+# w/o removing anything else
+echo
+echo "[removing installed pandas]"
+conda remove pandas -y --force
+pip uninstall -y pandas
 
 # build but don't install
 echo "[build em]"
 time python setup.py build_ext --inplace || exit 1
 
-# we may have run installations
-echo "[conda installs: ${REQ_RUN}]"
-if [ -e ${REQ_RUN} ]; then
-    time conda install -q --file=${REQ_RUN} || exit 1
-fi
+echo
+echo "[show environment]"
 
-# we may have additional pip installs
-echo "[pip installs: ${REQ_PIP}]"
-if [ -e ${REQ_PIP} ]; then
-   pip install -r $REQ_PIP
-fi
+conda list
diff --git a/ci/install_travis.sh b/ci/install_travis.sh
index 9ccb4baf25505..fd4a36f86db6c 100755
--- a/ci/install_travis.sh
+++ b/ci/install_travis.sh
@@ -50,16 +50,6 @@ conda config --set ssl_verify false || exit 1
 conda config --set quiet true --set always_yes true --set changeps1 false || exit 1
 conda update -q conda
 
-echo
-echo "[add channels]"
-conda config --remove channels defaults || exit 1
-conda config --add channels defaults || exit 1
-
-if [ "$CONDA_FORGE" ]; then
-    # add conda-forge channel as priority
-    conda config --add channels conda-forge || exit 1
-fi
-
 # Useful for debugging any issues with conda
 conda info -a || exit 1
 
@@ -90,55 +80,10 @@ echo
 echo "[create env]"
 
 # create our environment
-REQ="ci/requirements-${JOB}.build"
-time conda create -n pandas --file=${REQ} || exit 1
+time conda env create -q -n pandas --file="${ENV_FILE}" || exit 1
 
 source activate pandas
 
-# may have addtl installation instructions for this build
-echo
-echo "[build addtl installs]"
-REQ="ci/requirements-${JOB}.build.sh"
-if [ -e ${REQ} ]; then
-    time bash $REQ || exit 1
-fi
-
-time conda install -n pandas pytest>=3.1.0
-time pip install -q pytest-xdist moto
-
-if [ "$LINT" ]; then
-   conda install flake8=3.4.1
-   pip install cpplint
-fi
-
-if [ "$COVERAGE" ]; then
-    pip install coverage pytest-cov
-fi
-
-# we may have run installations
-echo
-echo "[conda installs]"
-REQ="ci/requirements-${JOB}.run"
-if [ -e ${REQ} ]; then
-    time conda install -n pandas --file=${REQ} || exit 1
-fi
-
-# we may have additional pip installs
-echo
-echo "[pip installs]"
-REQ="ci/requirements-${JOB}.pip"
-if [ -e ${REQ} ]; then
-   pip install -r $REQ
-fi
-
-# may have addtl installation instructions for this build
-echo
-echo "[addtl installs]"
-REQ="ci/requirements-${JOB}.sh"
-if [ -e ${REQ} ]; then
-    time bash $REQ || exit 1
-fi
-
 # remove any installed pandas package
 # w/o removing anything else
 echo
@@ -156,8 +101,8 @@ echo "[running setup.py develop]"
 python setup.py develop  || exit 1
 
 echo
-echo "[show pandas]"
-conda list pandas
+echo "[show environment]"
+conda list
 
 echo
 echo "[done]"
diff --git a/ci/requirements-2.7.build b/ci/requirements-2.7.build
deleted file mode 100644
index 17d34f3895c64..0000000000000
--- a/ci/requirements-2.7.build
+++ /dev/null
@@ -1,6 +0,0 @@
-python=2.7*
-python-dateutil=2.5.0
-pytz=2013b
-nomkl
-numpy=1.13*
-cython=0.24
diff --git a/ci/requirements-2.7.pip b/ci/requirements-2.7.pip
deleted file mode 100644
index 876d9e978fa84..0000000000000
--- a/ci/requirements-2.7.pip
+++ /dev/null
@@ -1,10 +0,0 @@
-blosc
-pandas-gbq
-html5lib
-beautifulsoup4
-pathlib
-backports.lzma
-py
-PyCrypto
-mock
-ipython
diff --git a/ci/requirements-2.7.run b/ci/requirements-2.7.run
deleted file mode 100644
index 7c10b98fb6e14..0000000000000
--- a/ci/requirements-2.7.run
+++ /dev/null
@@ -1,20 +0,0 @@
-python-dateutil=2.5.0
-pytz=2013b
-numpy
-xlwt=0.7.5
-numexpr
-pytables
-matplotlib
-openpyxl=2.4.0
-xlrd=0.9.2
-sqlalchemy=0.9.6
-lxml
-scipy
-xlsxwriter=0.5.2
-s3fs
-bottleneck
-psycopg2
-patsy
-pymysql=0.6.3
-jinja2=2.8
-xarray=0.8.0
diff --git a/ci/requirements-2.7.sh b/ci/requirements-2.7.sh
deleted file mode 100644
index 95169e5dcce57..0000000000000
--- a/ci/requirements-2.7.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-source activate pandas
-
-echo "install 27"
-
-conda install -n pandas -c conda-forge feather-format pyarrow=0.4.1 jemalloc=4.5.0.post fastparquet
diff --git a/ci/requirements-2.7_COMPAT.build b/ci/requirements-2.7_COMPAT.build
deleted file mode 100644
index 0a83a7346e8b5..0000000000000
--- a/ci/requirements-2.7_COMPAT.build
+++ /dev/null
@@ -1,5 +0,0 @@
-python=2.7*
-numpy=1.9.2
-cython=0.24
-python-dateutil=2.5.0
-pytz=2013b
diff --git a/ci/requirements-2.7_COMPAT.pip b/ci/requirements-2.7_COMPAT.pip
deleted file mode 100644
index 0e154dbc07525..0000000000000
--- a/ci/requirements-2.7_COMPAT.pip
+++ /dev/null
@@ -1,4 +0,0 @@
-html5lib==1.0b2
-beautifulsoup4==4.2.1
-openpyxl
-argparse
diff --git a/ci/requirements-2.7_COMPAT.run b/ci/requirements-2.7_COMPAT.run
deleted file mode 100644
index c3daed6e6e1da..0000000000000
--- a/ci/requirements-2.7_COMPAT.run
+++ /dev/null
@@ -1,14 +0,0 @@
-numpy=1.9.2
-python-dateutil=2.5.0
-pytz=2013b
-scipy=0.14.0
-xlwt=0.7.5
-xlrd=0.9.2
-bottleneck=1.0.0
-numexpr=2.4.4 # we test that we correctly don't use an unsupported numexpr
-pytables=3.2.2
-psycopg2
-pymysql=0.6.0
-sqlalchemy=0.7.8
-xlsxwriter=0.5.2
-jinja2=2.8
diff --git a/ci/requirements-2.7_LOCALE.build b/ci/requirements-2.7_LOCALE.build
deleted file mode 100644
index a6f2e25387910..0000000000000
--- a/ci/requirements-2.7_LOCALE.build
+++ /dev/null
@@ -1,5 +0,0 @@
-python=2.7*
-python-dateutil
-pytz=2013b
-numpy=1.9.2
-cython=0.24
diff --git a/ci/requirements-2.7_LOCALE.pip b/ci/requirements-2.7_LOCALE.pip
deleted file mode 100644
index 1b825bbf492ca..0000000000000
--- a/ci/requirements-2.7_LOCALE.pip
+++ /dev/null
@@ -1,3 +0,0 @@
-html5lib==1.0b2
-beautifulsoup4==4.2.1
-blosc
diff --git a/ci/requirements-2.7_LOCALE.run b/ci/requirements-2.7_LOCALE.run
deleted file mode 100644
index 0a809a7dd6e5d..0000000000000
--- a/ci/requirements-2.7_LOCALE.run
+++ /dev/null
@@ -1,12 +0,0 @@
-python-dateutil
-pytz
-numpy=1.9.2
-xlwt=0.7.5
-openpyxl=2.4.0
-xlsxwriter=0.5.2
-xlrd=0.9.2
-bottleneck=1.0.0
-matplotlib=1.4.3
-sqlalchemy=0.8.1
-lxml
-scipy
diff --git a/ci/requirements-2.7_WIN.pip b/ci/requirements-2.7_WIN.pip
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/ci/requirements-2.7_WIN.run b/ci/requirements-2.7_WIN.run
deleted file mode 100644
index c4ca7fc736bb1..0000000000000
--- a/ci/requirements-2.7_WIN.run
+++ /dev/null
@@ -1,18 +0,0 @@
-dateutil
-pytz
-numpy=1.10*
-xlwt
-numexpr
-pytables==3.2.2
-matplotlib
-openpyxl
-xlrd
-sqlalchemy
-lxml
-scipy
-xlsxwriter
-s3fs
-bottleneck
-html5lib
-beautifulsoup4
-jinja2=2.8
diff --git a/ci/requirements-3.5.build b/ci/requirements-3.5.build
deleted file mode 100644
index f7befe3b31865..0000000000000
--- a/ci/requirements-3.5.build
+++ /dev/null
@@ -1,6 +0,0 @@
-python=3.5*
-python-dateutil
-pytz
-nomkl
-numpy
-cython
diff --git a/ci/requirements-3.5.pip b/ci/requirements-3.5.pip
deleted file mode 100644
index c9565f2173070..0000000000000
--- a/ci/requirements-3.5.pip
+++ /dev/null
@@ -1,2 +0,0 @@
-xarray==0.9.1
-pandas_gbq
diff --git a/ci/requirements-3.5.run b/ci/requirements-3.5.run
deleted file mode 100644
index 669cf437f2164..0000000000000
--- a/ci/requirements-3.5.run
+++ /dev/null
@@ -1,20 +0,0 @@
-pytz
-numpy
-openpyxl
-xlsxwriter
-xlrd
-xlwt
-scipy
-numexpr
-pytables
-html5lib
-lxml
-matplotlib
-jinja2
-bottleneck
-sqlalchemy
-pymysql
-psycopg2
-s3fs
-beautifulsoup4
-ipython
diff --git a/ci/requirements-3.5.sh b/ci/requirements-3.5.sh
deleted file mode 100644
index 529e1e8742722..0000000000000
--- a/ci/requirements-3.5.sh
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/bin/bash
-
-source activate pandas
-
-echo "install 35"
-
-# pip install python-dateutil to get latest
-conda remove -n pandas python-dateutil --force
-pip install python-dateutil
-
-conda install -n pandas -c conda-forge feather-format pyarrow=0.7.1
diff --git a/ci/requirements-3.5_ASCII.build b/ci/requirements-3.5_ASCII.build
deleted file mode 100644
index f7befe3b31865..0000000000000
--- a/ci/requirements-3.5_ASCII.build
+++ /dev/null
@@ -1,6 +0,0 @@
-python=3.5*
-python-dateutil
-pytz
-nomkl
-numpy
-cython
diff --git a/ci/requirements-3.5_ASCII.run b/ci/requirements-3.5_ASCII.run
deleted file mode 100644
index b9d543f557d06..0000000000000
--- a/ci/requirements-3.5_ASCII.run
+++ /dev/null
@@ -1,3 +0,0 @@
-python-dateutil
-pytz
-numpy
diff --git a/ci/requirements-3.5_OSX.build b/ci/requirements-3.5_OSX.build
deleted file mode 100644
index f5bc01b67a20a..0000000000000
--- a/ci/requirements-3.5_OSX.build
+++ /dev/null
@@ -1,4 +0,0 @@
-python=3.5*
-nomkl
-numpy=1.10.4
-cython
diff --git a/ci/requirements-3.5_OSX.pip b/ci/requirements-3.5_OSX.pip
deleted file mode 100644
index d1fc1fe24a079..0000000000000
--- a/ci/requirements-3.5_OSX.pip
+++ /dev/null
@@ -1 +0,0 @@
-python-dateutil==2.5.3
diff --git a/ci/requirements-3.5_OSX.run b/ci/requirements-3.5_OSX.run
deleted file mode 100644
index 1d83474d10f2f..0000000000000
--- a/ci/requirements-3.5_OSX.run
+++ /dev/null
@@ -1,16 +0,0 @@
-pytz
-numpy=1.10.4
-openpyxl
-xlsxwriter
-xlrd
-xlwt
-numexpr
-pytables
-html5lib
-lxml
-matplotlib
-jinja2
-bottleneck
-xarray
-s3fs
-beautifulsoup4
diff --git a/ci/requirements-3.5_OSX.sh b/ci/requirements-3.5_OSX.sh
deleted file mode 100644
index c2978b175968c..0000000000000
--- a/ci/requirements-3.5_OSX.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-source activate pandas
-
-echo "install 35_OSX"
-
-conda install -n pandas -c conda-forge feather-format==0.3.1 fastparquet
diff --git a/ci/requirements-3.6.build b/ci/requirements-3.6.build
deleted file mode 100644
index 1c4b46aea3865..0000000000000
--- a/ci/requirements-3.6.build
+++ /dev/null
@@ -1,6 +0,0 @@
-python=3.6*
-python-dateutil
-pytz
-nomkl
-numpy
-cython
diff --git a/ci/requirements-3.6.pip b/ci/requirements-3.6.pip
deleted file mode 100644
index 753a60d6c119a..0000000000000
--- a/ci/requirements-3.6.pip
+++ /dev/null
@@ -1 +0,0 @@
-brotlipy
diff --git a/ci/requirements-3.6.run b/ci/requirements-3.6.run
deleted file mode 100644
index 822144a80bc9a..0000000000000
--- a/ci/requirements-3.6.run
+++ /dev/null
@@ -1,25 +0,0 @@
-python-dateutil
-pytz
-numpy
-scipy
-openpyxl
-xlsxwriter
-xlrd
-xlwt
-numexpr
-pytables
-matplotlib
-lxml
-html5lib
-jinja2
-sqlalchemy
-pymysql
-feather-format
-pyarrow
-psycopg2
-python-snappy
-fastparquet
-beautifulsoup4
-s3fs
-xarray
-ipython
diff --git a/ci/requirements-3.6.sh b/ci/requirements-3.6.sh
deleted file mode 100644
index f5c3dbf59a29d..0000000000000
--- a/ci/requirements-3.6.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-source activate pandas
-
-echo "[install 3.6 downstream deps]"
-
-conda install -n pandas -c conda-forge pandas-datareader xarray geopandas seaborn statsmodels scikit-learn dask
diff --git a/ci/requirements-3.6_DOC.build b/ci/requirements-3.6_DOC.build
deleted file mode 100644
index bc72eed2a0d4e..0000000000000
--- a/ci/requirements-3.6_DOC.build
+++ /dev/null
@@ -1,5 +0,0 @@
-python=3.6*
-python-dateutil
-pytz
-numpy=1.13*
-cython
diff --git a/ci/requirements-3.6_DOC.run b/ci/requirements-3.6_DOC.run
deleted file mode 100644
index 084f38ce17eb2..0000000000000
--- a/ci/requirements-3.6_DOC.run
+++ /dev/null
@@ -1,25 +0,0 @@
-ipython
-ipykernel
-ipywidgets
-sphinx
-nbconvert
-nbformat
-notebook
-matplotlib
-seaborn
-scipy
-lxml
-beautifulsoup4
-html5lib
-pytables
-python-snappy
-openpyxl
-xlrd
-xlwt
-xlsxwriter
-sqlalchemy
-numexpr
-bottleneck
-statsmodels
-xarray
-pyqt
diff --git a/ci/requirements-3.6_DOC.sh b/ci/requirements-3.6_DOC.sh
deleted file mode 100644
index aec0f62148622..0000000000000
--- a/ci/requirements-3.6_DOC.sh
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/bin/bash
-
-source activate pandas
-
-echo "[install DOC_BUILD deps]"
-
-pip install pandas-gbq
-
-conda install -n pandas -c conda-forge feather-format pyarrow nbsphinx pandoc fastparquet
-
-conda install -n pandas -c r r rpy2 --yes
diff --git a/ci/requirements-3.6_LOCALE.build b/ci/requirements-3.6_LOCALE.build
deleted file mode 100644
index 1c4b46aea3865..0000000000000
--- a/ci/requirements-3.6_LOCALE.build
+++ /dev/null
@@ -1,6 +0,0 @@
-python=3.6*
-python-dateutil
-pytz
-nomkl
-numpy
-cython
diff --git a/ci/requirements-3.6_LOCALE.pip b/ci/requirements-3.6_LOCALE.pip
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/ci/requirements-3.6_LOCALE.run b/ci/requirements-3.6_LOCALE.run
deleted file mode 100644
index ad54284c6f7e3..0000000000000
--- a/ci/requirements-3.6_LOCALE.run
+++ /dev/null
@@ -1,22 +0,0 @@
-python-dateutil
-pytz
-numpy
-scipy
-openpyxl
-xlsxwriter
-xlrd
-xlwt
-numexpr
-pytables
-matplotlib
-lxml
-html5lib
-jinja2
-sqlalchemy
-pymysql
-# feather-format (not available on defaults ATM)
-psycopg2
-beautifulsoup4
-s3fs
-xarray
-ipython
diff --git a/ci/requirements-3.6_LOCALE_SLOW.build b/ci/requirements-3.6_LOCALE_SLOW.build
deleted file mode 100644
index 1c4b46aea3865..0000000000000
--- a/ci/requirements-3.6_LOCALE_SLOW.build
+++ /dev/null
@@ -1,6 +0,0 @@
-python=3.6*
-python-dateutil
-pytz
-nomkl
-numpy
-cython
diff --git a/ci/requirements-3.6_LOCALE_SLOW.pip b/ci/requirements-3.6_LOCALE_SLOW.pip
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/ci/requirements-3.6_LOCALE_SLOW.run b/ci/requirements-3.6_LOCALE_SLOW.run
deleted file mode 100644
index ad54284c6f7e3..0000000000000
--- a/ci/requirements-3.6_LOCALE_SLOW.run
+++ /dev/null
@@ -1,22 +0,0 @@
-python-dateutil
-pytz
-numpy
-scipy
-openpyxl
-xlsxwriter
-xlrd
-xlwt
-numexpr
-pytables
-matplotlib
-lxml
-html5lib
-jinja2
-sqlalchemy
-pymysql
-# feather-format (not available on defaults ATM)
-psycopg2
-beautifulsoup4
-s3fs
-xarray
-ipython
diff --git a/ci/requirements-3.6_NUMPY_DEV.build b/ci/requirements-3.6_NUMPY_DEV.build
deleted file mode 100644
index 336fbe86b57d8..0000000000000
--- a/ci/requirements-3.6_NUMPY_DEV.build
+++ /dev/null
@@ -1,2 +0,0 @@
-python=3.6*
-pytz
diff --git a/ci/requirements-3.6_NUMPY_DEV.build.sh b/ci/requirements-3.6_NUMPY_DEV.build.sh
deleted file mode 100644
index fd79142c5cebb..0000000000000
--- a/ci/requirements-3.6_NUMPY_DEV.build.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/bash
-
-source activate pandas
-
-echo "install numpy master wheel"
-
-# remove the system installed numpy
-pip uninstall numpy -y
-
-# install numpy wheel from master
-PRE_WHEELS="https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com"
-pip install --pre --upgrade --timeout=60 -f $PRE_WHEELS numpy scipy
-
-# install dateutil from master
-pip install -U git+git://github.com/dateutil/dateutil.git
-
-# cython via pip
-pip install cython
-
-true
diff --git a/ci/requirements-3.6_NUMPY_DEV.pip b/ci/requirements-3.6_NUMPY_DEV.pip
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/ci/requirements-3.6_NUMPY_DEV.run b/ci/requirements-3.6_NUMPY_DEV.run
deleted file mode 100644
index af44f198c687e..0000000000000
--- a/ci/requirements-3.6_NUMPY_DEV.run
+++ /dev/null
@@ -1 +0,0 @@
-pytz
diff --git a/ci/requirements-3.6_SLOW.build b/ci/requirements-3.6_SLOW.build
deleted file mode 100644
index bdcfe28105866..0000000000000
--- a/ci/requirements-3.6_SLOW.build
+++ /dev/null
@@ -1,5 +0,0 @@
-python=3.6*
-python-dateutil
-pytz
-numpy
-cython
diff --git a/ci/requirements-3.6_SLOW.pip b/ci/requirements-3.6_SLOW.pip
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/ci/requirements-3.6_SLOW.run b/ci/requirements-3.6_SLOW.run
deleted file mode 100644
index ab5253ad99e51..0000000000000
--- a/ci/requirements-3.6_SLOW.run
+++ /dev/null
@@ -1,19 +0,0 @@
-python-dateutil
-pytz
-numpy
-matplotlib
-scipy
-patsy
-xlwt
-openpyxl
-xlsxwriter
-xlrd
-numexpr
-pytables
-sqlalchemy
-lxml
-s3fs
-psycopg2
-pymysql
-html5lib
-beautifulsoup4
diff --git a/ci/requirements-3.6_WIN.pip b/ci/requirements-3.6_WIN.pip
deleted file mode 100644
index e69de29bb2d1d..0000000000000
diff --git a/ci/requirements-3.6_WIN.run b/ci/requirements-3.6_WIN.run
deleted file mode 100644
index 3042888763863..0000000000000
--- a/ci/requirements-3.6_WIN.run
+++ /dev/null
@@ -1,17 +0,0 @@
-python-dateutil
-pytz
-numpy=1.13*
-bottleneck
-openpyxl
-xlsxwriter
-xlrd
-xlwt
-scipy
-feather-format
-numexpr
-pytables
-matplotlib
-blosc
-thrift=0.10*
-fastparquet
-pyarrow
diff --git a/ci/travis-27-locale.yaml b/ci/travis-27-locale.yaml
new file mode 100644
index 0000000000000..1312c1296d46a
--- /dev/null
+++ b/ci/travis-27-locale.yaml
@@ -0,0 +1,27 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - bottleneck=1.0.0
+  - cython=0.24
+  - lxml
+  - matplotlib=1.4.3
+  - numpy=1.9.2
+  - openpyxl=2.4.0
+  - python-dateutil
+  - python-blosc
+  - python=2.7
+  - pytz
+  - pytz=2013b
+  - scipy
+  - sqlalchemy=0.8.1
+  - xlrd=0.9.2
+  - xlsxwriter=0.5.2
+  - xlwt=0.7.5
+  # universal
+  - pytest
+  - pytest-xdist
+  - pip:
+    - html5lib==1.0b2
+    - beautifulsoup4==4.2.1
diff --git a/ci/travis-27.yaml b/ci/travis-27.yaml
new file mode 100644
index 0000000000000..22b993a2da886
--- /dev/null
+++ b/ci/travis-27.yaml
@@ -0,0 +1,49 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - beautifulsoup4
+  - bottleneck
+  - cython=0.24
+  - fastparquet
+  - feather-format
+  - flake8=3.4.1
+  - html5lib
+  - ipython
+  - jemalloc=4.5.0.post
+  - jinja2=2.8
+  - lxml
+  - matplotlib
+  - mock
+  - nomkl
+  - numexpr
+  - numpy=1.13*
+  - openpyxl=2.4.0
+  - patsy
+  - psycopg2
+  - py
+  - pyarrow=0.4.1
+  - PyCrypto
+  - pymysql=0.6.3
+  - pytables
+  - python-blosc
+  - python-dateutil=2.5.0
+  - python=2.7*
+  - pytz=2013b
+  - s3fs
+  - scipy
+  - sqlalchemy=0.9.6
+  - xarray=0.8.0
+  - xlrd=0.9.2
+  - xlsxwriter=0.5.2
+  - xlwt=0.7.5
+  # universal
+  - pytest
+  - pytest-xdist
+  - moto
+  - pip:
+    - backports.lzma
+    - cpplint
+    - pandas-gbq
+    - pathlib
diff --git a/ci/travis-35-osx.yaml b/ci/travis-35-osx.yaml
new file mode 100644
index 0000000000000..e74abac4c9775
--- /dev/null
+++ b/ci/travis-35-osx.yaml
@@ -0,0 +1,27 @@
+name: pandas
+channels:
+  - defaults
+dependencies:
+  - beautifulsoup4
+  - bottleneck
+  - cython
+  - html5lib
+  - jinja2
+  - lxml
+  - matplotlib
+  - nomkl
+  - numexpr
+  - numpy=1.10.4
+  - openpyxl
+  - pytables
+  - python=3.5*
+  - pytz
+  - xarray
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - pytest
+  - pytest-xdist
+  - pip:
+    - python-dateutil==2.5.3
diff --git a/ci/travis-36-doc.yaml b/ci/travis-36-doc.yaml
new file mode 100644
index 0000000000000..c22dddbe0ba3f
--- /dev/null
+++ b/ci/travis-36-doc.yaml
@@ -0,0 +1,45 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+  - r
+dependencies:
+  - beautifulsoup4
+  - bottleneck
+  - cython
+  - fastparquet
+  - feather-format
+  - html5lib
+  - ipykernel
+  - ipython
+  - ipywidgets
+  - lxml
+  - matplotlib
+  - nbconvert
+  - nbformat
+  - nbsphinx
+  - notebook
+  - numexpr
+  - numpy=1.13*
+  - openpyxl
+  - pandoc
+  - pyqt
+  - pytables
+  - python-dateutil
+  - python-snappy
+  - python=3.6*
+  - pytz
+  - r
+  - rpy2
+  - scipy
+  - seaborn
+  - sphinx
+  - sqlalchemy
+  - statsmodels
+  - xarray
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - pytest
+  - pytest-xdist
diff --git a/ci/travis-36-numpydev.yaml b/ci/travis-36-numpydev.yaml
new file mode 100644
index 0000000000000..455d65feb4242
--- /dev/null
+++ b/ci/travis-36-numpydev.yaml
@@ -0,0 +1,16 @@
+name: pandas
+channels:
+  - defaults
+dependencies:
+  - python=3.6*
+  - pytz
+  - Cython
+  # universal
+  - pytest
+  - pytest-xdist
+  - pip:
+    - "git+git://github.com/dateutil/dateutil.git"
+    - "-f https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com"
+    - "--pre"
+    - "numpy"
+    - "scipy"
diff --git a/ci/travis-36-slow.yaml b/ci/travis-36-slow.yaml
new file mode 100644
index 0000000000000..6c475dc48723c
--- /dev/null
+++ b/ci/travis-36-slow.yaml
@@ -0,0 +1,30 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - beautifulsoup4
+  - cython
+  - html5lib
+  - lxml
+  - matplotlib
+  - numexpr
+  - numpy
+  - openpyxl
+  - patsy
+  - psycopg2
+  - pymysql
+  - pytables
+  - python-dateutil
+  - python=3.6*
+  - pytz
+  - s3fs
+  - scipy
+  - sqlalchemy
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - pytest
+  - pytest-xdist
+  - moto
diff --git a/ci/travis-36.yaml b/ci/travis-36.yaml
new file mode 100644
index 0000000000000..fe057e714761e
--- /dev/null
+++ b/ci/travis-36.yaml
@@ -0,0 +1,47 @@
+name: pandas
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - beautifulsoup4
+  - cython
+  - dask
+  - fastparquet
+  - feather-format
+  - geopandas
+  - html5lib
+  - ipython
+  - jinja2
+  - lxml
+  - matplotlib
+  - nomkl
+  - numexpr
+  - numpy
+  - openpyxl
+  - pandas-datareader
+  - psycopg2
+  - pyarrow
+  - pymysql
+  - pytables
+  - python-dateutil
+  - python-snappy
+  - python=3.6*
+  - pytz
+  - s3fs
+  - scikit-learn
+  - scipy
+  - seaborn
+  - sqlalchemy
+  - statsmodels
+  - xarray
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  # universal
+  - pytest
+  - pytest-xdist
+  - pytest-cov
+  - moto
+  - pip:
+    - brotlipy
+    - coverage
diff --git a/circle.yml b/circle.yml
index 9d49145af54e3..66415defba6fe 100644
--- a/circle.yml
+++ b/circle.yml
@@ -21,13 +21,13 @@ dependencies:
     - >
       case $CIRCLE_NODE_INDEX in
        0)
-         sudo apt-get install language-pack-it && ./ci/install_circle.sh JOB="2.7_COMPAT" LOCALE_OVERRIDE="it_IT.UTF-8" ;;
+         sudo apt-get install language-pack-it && ./ci/install_circle.sh JOB="2.7_COMPAT" ENV_FILE="ci/circle-27-compat.yaml" LOCALE_OVERRIDE="it_IT.UTF-8" ;;
        1)
-         sudo apt-get install language-pack-zh-hans && ./ci/install_circle.sh JOB="3.6_LOCALE" LOCALE_OVERRIDE="zh_CN.UTF-8" ;;
+         sudo apt-get install language-pack-zh-hans && ./ci/install_circle.sh JOB="3.6_LOCALE" ENV_FILE="ci/circle-36-locale.yaml" LOCALE_OVERRIDE="zh_CN.UTF-8" ;;
        2)
-         sudo apt-get install language-pack-zh-hans && ./ci/install_circle.sh JOB="3.6_LOCALE_SLOW" LOCALE_OVERRIDE="zh_CN.UTF-8" ;;
+         sudo apt-get install language-pack-zh-hans && ./ci/install_circle.sh JOB="3.6_LOCALE_SLOW" ENV_FILE="ci/circle-36-locale_slow.yaml" LOCALE_OVERRIDE="zh_CN.UTF-8" ;;
        3)
-         ./ci/install_circle.sh JOB="3.5_ASCII" LOCALE_OVERRIDE="C" ;;
+         ./ci/install_circle.sh JOB="3.5_ASCII" ENV_FILE="ci/circle-35-ascii.yaml" LOCALE_OVERRIDE="C" ;;
       esac
     - ./ci/show_circle.sh
 
diff --git a/pandas/tests/io/parser/test_network.py b/pandas/tests/io/parser/test_network.py
index 416535aac3a4c..fdf45f307e953 100644
--- a/pandas/tests/io/parser/test_network.py
+++ b/pandas/tests/io/parser/test_network.py
@@ -183,7 +183,6 @@ def test_read_csv_handles_boto_s3_object(self,
         expected = read_csv(tips_file)
         tm.assert_frame_equal(result, expected)
 
-    @pytest.mark.xfail(reason="buggy s3 / moto interaction on CI: gh-20720")
     def test_read_csv_chunked_download(self, s3_resource, caplog):
         # 8 MB, S3FS usees 5MB chunks
         df = DataFrame(np.random.randn(100000, 4), columns=list('abcd'))
diff --git a/pandas/tests/io/test_parquet.py b/pandas/tests/io/test_parquet.py
index 41a1db57c954b..11cbea8ce6331 100644
--- a/pandas/tests/io/test_parquet.py
+++ b/pandas/tests/io/test_parquet.py
@@ -432,7 +432,6 @@ def test_categorical_unsupported(self, pa_lt_070):
         df = pd.DataFrame({'a': pd.Categorical(list('abc'))})
         self.check_error_on_write(df, pa, NotImplementedError)
 
-    @pytest.mark.xfail(reason="buggy s3 / moto interaction on CI: gh-20720")
     def test_s3_roundtrip(self, df_compat, s3_resource, pa):
         # GH #19134
         check_round_trip(df_compat, pa,
@@ -499,7 +498,6 @@ def test_filter_row_groups(self, fp):
             result = read_parquet(path, fp, filters=[('a', '==', 0)])
         assert len(result) == 1
 
-    @pytest.mark.xfail(reason="buggy s3 / moto interaction on CI: gh-20720")
     def test_s3_roundtrip(self, df_compat, s3_resource, fp):
         # GH #19134
         check_round_trip(df_compat, fp,