diff --git a/.gitattributes b/.gitattributes
index 6346d59..cfe9c38 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,6 +3,6 @@
 /.gitignore export-ignore
 /phpcs.xml.dist export-ignore
 /psalm.xml.dist export-ignore
-/.travis.yml export-ignore
 /README.md export-ignore
 /codeception.yml export-ignore
+/.github export-ignore
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index e5df36b..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,51 +0,0 @@
-language: php
-php:
-  - 7.3
-  - 7.4
-  - nightly
-before_install:
-  - phpenv config-rm xdebug.ini || true
-
-install:
-  - composer config --global discard-changes true
-  - travis_retry composer install
-  - if [[ "$DEPS" = 'high' || "$DEPS" = 'dev' ]]; then travis_retry composer $DEFAULT_COMPOSER_FLAGS update; fi
-  - if [[ "$DEPS" = 'high' ]]; then composer require $DEFAULT_COMPOSER_FLAGS --prefer-stable --update-with-dependencies vimeo/psalm; fi
-  - if [[ "$DEPS" = 'low' ]]; then travis_retry composer $DEFAULT_COMPOSER_FLAGS --prefer-lowest --prefer-stable update; fi
-  - if [[ "$DEPS" = 'stable' ]]; then travis_retry composer $DEFAULT_COMPOSER_FLAGS --prefer-stable update; fi
-  - ./vendor/bin/psalm --version
-
-script: composer check
-
-env:
-    global:
-      - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-suggest"
-    jobs:
-      - DEPS="low"
-      - DEPS="high"
-      - DEPS="stable"
-      - DEPS="dev"
-
-cache:
-  directories:
-    - $HOME/.composer/cache/files
-    - $HOME/.composer/cache/vcs
-
-jobs:
-  allow_failures:
-    - php: 7.1
-      env: DEPS="dev"
-    - php: 7.2
-      env: DEPS="dev"
-    - php: 7.3
-      env: DEPS="dev"
-    - php: 7.4
-      env: DEPS="dev"
-    - php: nightly
-      env: DEPS="low"
-    - php: nightly
-      env: DEPS="high"
-    - php: nightly
-      env: DEPS="stable"
-    - php: nightly
-      env: DEPS="dev"
diff --git a/composer.json b/composer.json
index 38a60c7..f4a9dda 100755
--- a/composer.json
+++ b/composer.json
@@ -18,12 +18,15 @@
         "ext-simplexml": "*",
         "composer/semver": "^1.4 || ^2.0 || ^3.0",
         "composer/package-versions-deprecated": "^1.10",
-        "phpunit/phpunit": "^7.5 || ^8.0 || ^9.0",
         "vimeo/psalm": "dev-master || dev-4.x || ^4.0"
     },
+    "conflict": {
+        "phpunit/phpunit": "<7.5"
+    },
     "require-dev": {
         "php": "^7.3 || ^8.0",
         "codeception/codeception": "^4.0.3",
+        "phpunit/phpunit": "^7.5 || ^8.0 || ^9.0",
         "squizlabs/php_codesniffer": "^3.3.1",
         "weirdan/codeception-psalm-module": "^0.11.0",
         "weirdan/prophecy-shim": "^1.0 || ^2.0"
diff --git a/src/Hooks/TestCaseHandler.php b/src/Hooks/TestCaseHandler.php
index 7220ff7..892c8e2 100644
--- a/src/Hooks/TestCaseHandler.php
+++ b/src/Hooks/TestCaseHandler.php
@@ -427,10 +427,16 @@ class TestCaseHandler implements
             return $union->getAtomicTypes();
         }
 
-        /** @psalm-suppress DeprecatedMethod annotated for newer versions that deprecated the method */
-        $types = $union->getTypes();
-        assert(!empty($types));
-        return $types;
+        if (method_exists($union, 'getTypes')) {
+            /**
+             * @psalm-suppress DeprecatedMethod annotated for newer versions that deprecated the method
+             * @var non-empty-array<string, Type\Atomic> annotated for versions missing the method
+             */
+            $types = $union->getTypes();
+            return $types;
+        }
+
+        throw new RuntimeException('Unexpected: union has no way to get it constituent types');
     }
 
     private static function unionizeIterables(Codebase $codebase, Type\Union $iterables): Type\Atomic\TIterable
@@ -584,8 +590,7 @@ class TestCaseHandler implements
     {
         if (method_exists($docblock, 'getStartLine')) {
             //typecasting is done on purpose, compatability with psalm old versions
-            /** @psalm-suppress RedundantCondition */
-            return (int) $docblock->getStartLine();
+            return $docblock->getStartLine();
         }
         /** @psalm-suppress DeprecatedMethod */
         return $docblock->getLine();
diff --git a/src/VersionUtils.php b/src/VersionUtils.php
index 9ffa048..5cab8f0 100644
--- a/src/VersionUtils.php
+++ b/src/VersionUtils.php
@@ -14,6 +14,8 @@ abstract class VersionUtils
          * @psalm-suppress RedundantCondition
          * @psalm-suppress DeprecatedClass
          * @psalm-suppress ArgumentTypeCoercion
+         * @psalm-suppress RedundantCast
+         * @psalm-suppress RedundantCondition
          */
         $currentVersion = (string) explode('@', Versions::getVersion($package))[0];