diff --git a/.appveyor.yml b/.appveyor.yml
index 385e913..5ac7a9e 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -64,9 +64,10 @@ install:
     - cmd: conda config --get
 
     # Create the test environment.
-    - cmd: conda create -y -n testenv python="%CONDA_PY%"
+    - cmd: conda create -y -n testenv
+    - cmd: conda activate testenv
+    - cmd: echo "python %CONDA_PY%.*" >> "%CONDA_PREFIX%\\conda-meta\\pinned"
     - cmd: conda env update -n testenv --file environment_ci.yml
-    - cmd: activate testenv
 
 # Skip .NET project specific build phase.
 build: off
diff --git a/.travis.yml b/.travis.yml
index 59849de..05517f5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,18 +21,18 @@ install:
   - openssl md5 miniconda.sh | grep e1045ee415162f944b6aebfe560b8fee
   - bash miniconda.sh -b -p ~/miniconda
   - rm miniconda.sh
-  - source ~/miniconda/bin/activate root
+  - source ~/miniconda/etc/profile.d/conda.sh
+  - conda activate
   - conda config --set show_channel_urls true
   - conda update -y -n root --all
   - conda install -y -n root conda-build
   - conda clean -tipsy
 
   # Create the test environment.
-  - conda create -y -n testenv python="${PYVER}"
-  - conda remove -y --force -n testenv openssl
+  - conda create -y -n testenv
+  - conda activate testenv
+  - echo "python ${PYVER}.*" >> "${CONDA_PREFIX}/conda-meta/pinned"
   - conda env update -n testenv --file environment_ci.yml
-  - conda list --full-name -n testenv openssl || conda install -y -n testenv openssl
-  - source activate testenv
 
 # command to run tests, e.g. python setup.py test
 script:
@@ -44,12 +44,12 @@ script:
 
 # Report coverage
 after_success:
-  - source activate root
+  - conda activate
   - conda create -y -n dplenv python="3.5";
   - conda remove -y --force -n dplenv openssl
   - conda env update -n dplenv --file environment_dpl.yml
   - conda list --full-name -n dplenv openssl || conda install -y -n dplenv openssl
-  - source activate dplenv
+  - conda activate dplenv
   - coveralls
 
 # Disable email notifications.
diff --git a/environment_ci.yml b/environment_ci.yml
index 6e5aec8..91f50ff 100644
--- a/environment_ci.yml
+++ b/environment_ci.yml
@@ -5,7 +5,7 @@ channels:
 
 dependencies:
   - pip==18.1
-  - wheel==0.32.2
+  - wheel==0.32.0
   - coverage==4.5.2
   - pytest==3.10.1
   - cython==0.29