diff --git a/.travis.yml b/.travis.yml
index 0f2cc93..75ca96a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,15 @@ notifications:
 
 matrix:
   include:
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9 OPENCV=2.4.13.6
+
     - compiler: gcc
       addons:
         apt:
@@ -27,6 +36,33 @@ matrix:
             - g++-4.9
       env: COMPILER=g++-4.9 OPENCV=2.4.13.4
 
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9 OPENCV=2.4.13
+
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9 OPENCV=2.4.12
+
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9 OPENCV=2.3.0
+
     - compiler: gcc
       addons:
         apt:
@@ -63,6 +99,15 @@ matrix:
             - g++-4.9
       env: COMPILER=g++-4.9 OPENCV=3.3.0
 
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9 OPENCV=3.3.1
+
     - compiler: gcc
       addons:
         apt:
@@ -72,6 +117,15 @@ matrix:
             - g++-4.9
       env: COMPILER=g++-4.9 OPENCV=3.4.0
 
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9 OPENCV=3.4.1
+
 before_install:
     - sudo apt-get update -qq