diff --git a/.travis.yml b/.travis.yml
index e99d890..a510b94 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@
     directories:
         - $HOME/.cache/pip
         - $HOME/ossl-098l
+        - $HOME/ossl-100t
 
 matrix:
     include:
@@ -21,6 +22,8 @@
           env: TOXENV=py35
         - python: pypy
           env: TOXENV=pypy
+        - python: 3.5
+          env: TOXENV=py35 OPENSSL=1.0.0
         - python: 2.6
           env: TOXENV=py26 OPENSSL=0.9.8
         - python: 2.7
diff --git a/.travis/install.sh b/.travis/install.sh
index 5e8c11c..499233d 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -67,6 +67,9 @@
         # patches, but while that's in jenkins we don't get coverage data from it).
         OPENSSL_VERSION_NUMBER="0.9.8l"
         OPENSSL_DIR="ossl-098l"
+    elif [[ "${OPENSSL}" == "1.0.0" ]]; then
+        OPENSSL_VERSION_NUMBER="1.0.0t"
+        OPENSSL_DIR="ossl-100t"
     fi
     # download, compile, and install if it's not already present via travis cache
     if [ -n "$OPENSSL_DIR" ]; then
diff --git a/.travis/run.sh b/.travis/run.sh
index 2b94e22..9619c24 100755
--- a/.travis/run.sh
+++ b/.travis/run.sh
@@ -28,6 +28,8 @@
     fi
     if [[ "${OPENSSL}" == "0.9.8" ]]; then
         OPENSSL_DIR="ossl-098l"
+    elif [[ "${OPENSSL}" == "1.0.0" ]]; then
+        OPENSSL_DIR="ossl-100t"
     fi
 
     if [ -n "$OPENSSL_DIR" ]; then