diff --git a/.appveyor.yml b/.appveyor.yml
index 7c870f0..dc53d80 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -21,7 +21,7 @@ install:
   - conda update -q conda
   - conda info -a
   - conda install gtest cmake -c conda-forge
-  - conda install xtensor=0.21.2 -c conda-forge
+  - conda install xtensor=0.21.4 -c conda-forge
   - conda install m2w64-openblas -c msys2
   # Patch OpenBLASConfig.cmake
   - ps: (Get-Content $Env:MINICONDA\Library\mingw-w64\lib\cmake\openblas\OpenBLASConfig.cmake).replace('mingw64', 'mingw-w64') | Set-Content $Env:MINICONDA\Library\mingw-w64\lib\cmake\openblas\OpenBLASConfig.cmake
diff --git a/.travis.yml b/.travis.yml
index 13974f8..1804fe9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,25 +58,6 @@ matrix:
           packages:
             - g++-6
       env: COMPILER=gcc GCC=6 BLAS=mkl
-    - os: linux
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-          packages:
-            - g++-4.9
-            - clang-3.6
-      env: COMPILER=clang CLANG=3.6 BLAS=OpenBLAS
-    - os: linux
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-xenial-3.9
-          packages:
-            - g++-4.9
-            - clang-3.9
-      env: COMPILER=clang CLANG=3.9 BLAS=OpenBLAS
     - os: linux
       addons:
         apt:
@@ -145,9 +126,9 @@ install:
     - conda info -a
     - conda install cmake -c conda-forge
     # Install xtensor and BLAS
-    - conda install xtensor=0.21.2 -c conda-forge
+    - conda install xtensor=0.21.4 -c conda-forge
     - if [[ "$BLAS" == "OpenBLAS" ]]; then
-        conda install openblas "blas * openblas" -c conda-forge;
+        conda install openblas==0.3.7 "blas * openblas" -c conda-forge;
       elif [[ "$BLAS" == "mkl" ]]; then
         conda install mkl;
       fi
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index b061932..7c44866 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -42,7 +42,7 @@ jobs:
                         gtest ^
                         mkl-devel ^
                         ninja ^
-                        xtensor=0.21.2 ^
+                        xtensor=0.21.4 ^
                         python=3.6
           conda list
         displayName: "Install conda packages"