diff --git a/README b/README
index bb23a7901faa0818d7d858083bb89db999b9106e..65e125d039751812dd84a7b1181aa6913e4149ad 100644
--- a/README
+++ b/README
@@ -46,8 +46,8 @@ AUTHOR
 
 VERSION
 
-    0.7.4
+    0.7.5
 
 LAST UPDATED
 
-    Thursday, May 16th, 2019
+    Wednesday, August 14th, 2019
diff --git a/definition-files/comet/ubuntu/ubuntu-cuda-opencl-openmpi.def b/definition-files/comet/ubuntu/ubuntu-cuda-opencl-openmpi.def
index 17f1100bc01f9a8c18e3536615c0515304790ab6..1b7c218419f476854938a2151f3b2073f1fc4b8e 100644
--- a/definition-files/comet/ubuntu/ubuntu-cuda-opencl-openmpi.def
+++ b/definition-files/comet/ubuntu/ubuntu-cuda-opencl-openmpi.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL https://software.intel.com/en-us/articles/opencl-drivers#latest_CPU_runtime
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.2
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 8192
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20181203
+    LAST_UPDATED 20190814
 
 %setup
 
@@ -30,9 +30,14 @@ OSVersion: xenial
     export PATH="/usr/local/cuda-9.2/bin${PATH:+:${PATH}}"
     export LD_LIBRARY_PATH="/usr/local/cuda-9.2/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
     export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/local/cuda/extras/CUPTI/lib64"
+
+    # Set paths to OpenMPI binaries and libraries
     export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
     export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
 
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -72,8 +77,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions
@@ -347,10 +353,6 @@ OSVersion: xenial
     ./configure --prefix=/opt/openmpi-1.8.4 --with-cuda
     make all install
 
-    # Set paths to OpenMPI binaries and libraries
-    export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
-    export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
- 
     # Update database for mlocate
     updatedb
 
diff --git a/definition-files/comet/ubuntu/ubuntu-cuda-opencl.def b/definition-files/comet/ubuntu/ubuntu-cuda-opencl.def
index b0ff3aeef98132ac098da6ef3da2b5694fdea638..eae3fc3dae987d8319e01247d0fab43ba90fce68 100644
--- a/definition-files/comet/ubuntu/ubuntu-cuda-opencl.def
+++ b/definition-files/comet/ubuntu/ubuntu-cuda-opencl.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL https://software.intel.com/en-us/articles/opencl-drivers#latest_CPU_runtime
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.2
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 8192
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20181203
+    LAST_UPDATED 20190814
 
 %setup
 
@@ -31,6 +31,9 @@ OSVersion: xenial
     export LD_LIBRARY_PATH="/usr/local/cuda-9.2/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
     export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/local/cuda/extras/CUPTI/lib64"
 
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -70,8 +73,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions
diff --git a/definition-files/comet/ubuntu/ubuntu-cuda-openmpi.def b/definition-files/comet/ubuntu/ubuntu-cuda-openmpi.def
index 7c74e4f3ff41d0d7d4eec9962a3abdfe8b5bba2b..859b3ca78fa4f96b098fc86221995378907e6f78 100644
--- a/definition-files/comet/ubuntu/ubuntu-cuda-openmpi.def
+++ b/definition-files/comet/ubuntu/ubuntu-cuda-openmpi.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL https://www.open-mpi.org/faq/?category=runcuda
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.2
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 8192
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20181203
+    LAST_UPDATED 20190814
 
 %setup
 
@@ -33,6 +33,9 @@ OSVersion: xenial
     export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
     export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
 
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -72,8 +75,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions
@@ -310,10 +314,6 @@ OSVersion: xenial
     ./configure --prefix=/opt/openmpi-1.8.4 --with-cuda
     make all install
 
-    # Set paths to OpenMPI binaries and libraries
-    export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
-    export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
-
     # Update database for mlocate
     updatedb
 
diff --git a/definition-files/comet/ubuntu/ubuntu-cuda.def b/definition-files/comet/ubuntu/ubuntu-cuda.def
index 7305a8dd2e48c31ef14ca59314e926a172af3153..3369f7db7cb6fabbe78e299d6b51659defb9613b 100644
--- a/definition-files/comet/ubuntu/ubuntu-cuda.def
+++ b/definition-files/comet/ubuntu/ubuntu-cuda.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL https://developer.nvidia.com/cuda-zone
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.2
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 8192
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20181203
+    LAST_UPDATED 20190814
 
 %setup
 
@@ -31,6 +31,9 @@ OSVersion: xenial
     export LD_LIBRARY_PATH="/usr/local/cuda-9.2/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
     export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/local/cuda/extras/CUPTI/lib64"
 
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -70,8 +73,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions
@@ -263,11 +267,6 @@ OSVersion: xenial
     dpkg -i libnccl2_2.3.4-1+cuda9.2_amd64.deb
     dpkg -i libnccl-dev_2.3.4-1+cuda9.2_amd64.deb
 
-    # Set paths to CUDA binaries and libraries
-    export PATH="/usr/local/cuda-9.2/bin${PATH:+:${PATH}}"
-    export LD_LIBRARY_PATH="/usr/local/cuda-9.2/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
-    export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/local/cuda/extras/CUPTI/lib64"
-    
     # Update database for mlocate
     updatedb
 
diff --git a/definition-files/comet/ubuntu/ubuntu-mvapich2.def b/definition-files/comet/ubuntu/ubuntu-mvapich2.def
index d438a0a32cb0daac6251fb2fb8b58c3e3f852e75..e71931da71c2abed191cddf4e39061768d4ec253 100644
--- a/definition-files/comet/ubuntu/ubuntu-mvapich2.def
+++ b/definition-files/comet/ubuntu/ubuntu-mvapich2.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL http://mvapich.cse.ohio-state.edu/
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.1
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 2048
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20180619
+    LAST_UPDATED 20190814
 
 %setup
 
@@ -26,6 +26,13 @@ OSVersion: xenial
     # Set system locale
     export LC_ALL=C
 
+    # Set paths to MVAPICH2 binaries and libraries
+    export PATH="/opt/mvapich2/bin:${PATH}"
+    export LD_LIBRARY_PATH="/opt/mvapich2/lib:${LD_LIBRARY_PATH}"
+
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -65,8 +72,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions
@@ -130,11 +138,6 @@ OSVersion: xenial
     make
     make install
 
-    # Set container environment variables
-    cd /.singularity.d/env
-    echo 'export PATH="/opt/mvapich2/bin:${PATH}"' >> 90-environment.sh
-    echo 'export LD_LIBRARY_PATH="/opt/mvapich2/lib:${LD_LIBRARY_PATH}"' >> 90-environment.sh
-
     # Update database for mlocate
     updatedb
 
@@ -142,8 +145,12 @@ OSVersion: xenial
 
 %runscript
 
-%test
+    echo "                                                "
+    echo "      __________________  __  _______________   "
+    echo "    -----/ ____/ __ \/  |/  / ____/_  __/       "
+    echo "      --/ /   / / / / /|_/ / __/   / /          "
+    echo "       / /___/ /_/ / /  / / /___  / /           "
+    echo "       \____/\____/_/  /_/_____/ /_/            "
+    echo "                                                "
 
-    #export PATH="/opt/mvapich2/bin:${PATH}"
-    #export LD_LIBRARY_PATH="/opt/mvapich2/lib:${LD_LIBRARY_PATH}"
-    #mpirun --version
+%test
diff --git a/definition-files/comet/ubuntu/ubuntu-openmpi.def b/definition-files/comet/ubuntu/ubuntu-openmpi.def
index 9aaa5ccc1af38146afc0594ab1a035a9737f6c4a..7f72e6e5926866e459d05515480c3e5e2e730789 100644
--- a/definition-files/comet/ubuntu/ubuntu-openmpi.def
+++ b/definition-files/comet/ubuntu/ubuntu-openmpi.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL https://www.open-mpi.org/
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.1
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 2048
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20180619
+    LAST_UPDATED 20190814
 
 %setup
 
@@ -26,6 +26,13 @@ OSVersion: xenial
     # Set system locale
     export LC_ALL=C
 
+    # Set paths to OpenMPI binaries and libraries
+    export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
+    export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
+
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -65,8 +72,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions
@@ -127,17 +135,12 @@ OSVersion: xenial
     tar -xzvf openmpi-1.8.4.tar.gz
     cd openmpi-1.8.4
     ./configure --prefix=/opt/openmpi-1.8.4
-     make all install
+    make all install
 
     # Set paths to OpenMPI binaries and libraries
     export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
     export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
 
-    # Set container environment variables
-    cd /.singularity.d/env
-    echo 'export PATH="/opt/openmpi-1.8.4/bin:${PATH}"' >> 90-environment.sh
-    echo 'export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"' >> 90-environment.sh
-
     # Update database for mlocate
     updatedb
 
@@ -145,8 +148,12 @@ OSVersion: xenial
 
 %runscript
 
-%test
+    echo "                                                "
+    echo "      __________________  __  _______________   "
+    echo "    -----/ ____/ __ \/  |/  / ____/_  __/       "
+    echo "      --/ /   / / / / /|_/ / __/   / /          "
+    echo "       / /___/ /_/ / /  / / /___  / /           "
+    echo "       \____/\____/_/  /_/_____/ /_/            "
+    echo "                                                "
 
-    #export PATH="/opt/openmpi-1.8.4/bin:${PATH}"
-    #export LD_LIBRARY_PATH="/opt/openmpi-1.8.4/lib:${LD_LIBRARY_PATH}"
-    #mpirun --version
+%test
diff --git a/definition-files/comet/ubuntu/ubuntu.def b/definition-files/comet/ubuntu/ubuntu.def
index 254df0fc8e38f9cbd4a0f920923b175f3982a18e..ededd8c0651aede3a634a6247e1e86468dfe11e7 100644
--- a/definition-files/comet/ubuntu/ubuntu.def
+++ b/definition-files/comet/ubuntu/ubuntu.def
@@ -9,7 +9,7 @@ OSVersion: xenial
     APPLICATION_URL https://www.ubuntu.com/
 
     SYSTEM_NAME comet
-    SYSTEM_SINGULARITY_VERSION 2.5.2
+    SYSTEM_SINGULARITY_VERSION 2.6.1
     SYSTEM_URL http://www.sdsc.edu/support/user_guides/comet.html
 
     SINGULARITY_IMAGE_SIZE 2048
@@ -17,7 +17,7 @@ OSVersion: xenial
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20181003
+    LAST_UPDATED 20190812
 
 %setup
 
@@ -26,6 +26,9 @@ OSVersion: xenial
     # Set system locale
     export LC_ALL=C
 
+    # Set default miniconda environment
+    export PATH="/opt/miniconda3/bin:${PATH}"
+
 %post -c /bin/bash
 
     # Set system locale
@@ -65,8 +68,9 @@ OSVersion: xenial
     apt-get -y install build-essential
     apt-get -y install cmake
     apt-get -y install libtool
-    apt-get -y install pkg-config
     apt-get -y install gfortran
+    apt-get -y install pkg-config
+    apt-get -y install wget
     apt-get -y install zip
 
     # Install expect to automate responses for interactive build questions