diff --git a/test/tests/php-argon2/container.php b/test/tests/php-argon2/container.php
index 018552a7da..6fa22f575f 100644
--- a/test/tests/php-argon2/container.php
+++ b/test/tests/php-argon2/container.php
@@ -1,26 +1,4 @@
 <?php
-if (file_exists('/etc/alpine-release')) {
-	if (version_compare(file_get_contents('/etc/alpine-release'), '3.8.0') < 0) {
-		echo "Skipping test; Alpine < 3.8";
-		exit(0);
-	}
-}
-else if (file_exists('/etc/debian_version')) {
-	if (version_compare(file_get_contents('/etc/debian_version'), '9.0') < 0) {
-		echo "Skipping test; Debian < 9.0";
-		exit(0);
-	}
-}
-else {
-	echo "FAIL: Unknown base image (neither /etc/alpine-release nor /etc/debian_version exists).\n";
-	exit(1);
-}
-
-if (version_compare(PHP_VERSION, '7.2.0') < 0) {
-	echo "Skipping test; PHP < 7.2";
-	exit(0);
-}
-
 if (!defined('PASSWORD_ARGON2I')) {
 	echo "FAIL: Constant PASSWORD_ARGON2I is not defined.\n";
 	exit(1);
diff --git a/test/tests/ruby-bundler/container.sh b/test/tests/ruby-bundler/container.sh
index d2493173dc..8d954b769c 100644
--- a/test/tests/ruby-bundler/container.sh
+++ b/test/tests/ruby-bundler/container.sh
@@ -13,9 +13,5 @@ cp Gemfile.lock Gemfile.lock.orig
 BUNDLE_FROZEN=1 bundle install
 diff -u Gemfile.lock.orig Gemfile.lock >&2
 
-if ruby -rbundler -e 'exit Gem::Version.new(Bundler::VERSION) >= Gem::Version.new("2.1") ? 0 : 1'; then
-	BUNDLE_DEPLOYMENT=1 bundle install
-else
-	bundle install --deployment
-fi
+bundle install --deployment
 diff -u Gemfile.lock.orig Gemfile.lock >&2
diff --git a/test/tests/ruby-gems/container.sh b/test/tests/ruby-gems/container.sh
index e71260699e..7f5d061724 100644
--- a/test/tests/ruby-gems/container.sh
+++ b/test/tests/ruby-gems/container.sh
@@ -20,22 +20,11 @@ gems="$(ruby -e '
 	require "json"
 	require "open-uri"
 
-	# https://github.com/ruby/ruby/commit/05aac90a1bcfeb180f5e78ea8b00a4d1b04d5eed
-	# https://bugs.ruby-lang.org/issues/15893
-	# for Ruby 2.5+, we should use "URI.open", but for Ruby 2.4 we still need to use "open(...)" directly
-	def openURI(uri)
-		if Gem::Version.create(RUBY_VERSION) >= Gem::Version.create("2.5")
-			URI.open(uri)
-		else
-			open(uri)
-		end
-	end
-
 	for gem in gems
 		# ruby 2.2.2+: rack activesupport
 		# ruby 2.0+: mime-types
 		# (jruby 1.7 is ruby 1.9)
-		gemRubyVersion = JSON.load(openURI("https://rubygems.org/api/v1/versions/#{ gem }.json"))[0]["ruby_version"]
+		gemRubyVersion = JSON.load(URI.open("https://rubygems.org/api/v1/versions/#{ gem }.json"))[0]["ruby_version"]
 		if Gem::Dependency.new("", gemRubyVersion).match?("", RUBY_VERSION)
 			puts gem
 		else