diff --git a/.travis.yml b/.travis.yml
index 03201ffc..4de30e58 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -47,11 +47,11 @@ before_script:
     - export PHPCS_DIR=/tmp/phpcs
     - export SNIFFS_DIR=/tmp/sniffs
     # Install CodeSniffer for WordPress Coding Standards checks.
-    - if [[ "$SNIFF" == "1" ]]; then git clone -b 2.9 --depth 1 https://github.com/squizlabs/PHP_CodeSniffer.git $PHPCS_DIR; fi
+    - if [[ "$SNIFF" == "1" ]]; then git clone -b 2.9.1 --depth 1 https://github.com/squizlabs/PHP_CodeSniffer.git $PHPCS_DIR; fi
     # Install WordPress Coding Standards.
-    - if [[ "$SNIFF" == "1" ]]; then git clone -b master --depth 1 https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards.git $SNIFFS_DIR; fi
+    - if [[ "$SNIFF" == "1" ]]; then git clone -b 0.11.0 --depth 1 https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards.git $SNIFFS_DIR; fi
     # Install PHP Compatibility sniffs.
-    - if [[ "$SNIFF" == "1" ]]; then git clone -b master --depth 1 https://github.com/wimg/PHPCompatibility.git $SNIFFS_DIR/PHPCompatibility; fi
+    - if [[ "$SNIFF" == "1" ]]; then git clone -b 7.1.5 --depth 1 https://github.com/wimg/PHPCompatibility.git $SNIFFS_DIR/PHPCompatibility; fi
     # Set install path for PHPCS sniffs.
     # @link https://github.com/squizlabs/PHP_CodeSniffer/blob/4237c2fc98cc838730b76ee9cee316f99286a2a7/CodeSniffer.php#L1941
     - if [[ "$SNIFF" == "1" ]]; then $PHPCS_DIR/scripts/phpcs --config-set installed_paths $SNIFFS_DIR; fi