diff --git a/.travis.yml b/.travis.yml
index 33949090..6008043b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -164,7 +164,7 @@ install:
   ############################################################################
   - |
     if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
-      CMAKE_URL="http://www.cmake.org/files/v3.3/cmake-3.3.1-Linux-x86_64.tar.gz"
+      CMAKE_URL="https://www.cmake.org/files/v3.3/cmake-3.3.1-Linux-x86_64.tar.gz"
       mkdir cmake3.3 && travis_retry wget --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C cmake3.3
       export PATH=${DEPS_DIR}/cmake3.3/bin:${PATH}
     fi