diff --git a/.travis.yml b/.travis.yml
index 837e79b58..e661d7b3e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,15 +13,19 @@ before_install:
     - sudo apt-get update
 
 install:
+    # nasm for building libpng
     - sudo apt-get install libsdl1.2-dev luarocks nasm
-    - sudo luarocks install busted
+    # install an older version of lua_cliargs for busted v1.10.0
+    - sudo luarocks install lua_cliargs 2.1-2
+    # recent versions of busted may cause some weird segmentation faults
+    - git clone https://github.com/Olivine-Labs/busted/
+    - cd busted && git checkout v1.10.0 && sudo luarocks make && cd ..
     - sudo luarocks install luacov
     - sudo luarocks install luacov-coveralls --server=http://rocks.moonscript.org/dev
 
 script:
     - make fetchthirdparty all
     - sudo cp base/build/*/luajit /usr/bin/
-    - sudo ln -sf /usr/bin/luajit /usr/bin/lua
     - make testfront
 
 after_success:
diff --git a/Makefile b/Makefile
index 8ad990ab8..55f7f669b 100644
--- a/Makefile
+++ b/Makefile
@@ -93,14 +93,14 @@ $(INSTALL_DIR)/koreader/.luacov:
 		ln -sf ../../.luacov $(INSTALL_DIR)/koreader
 
 testfront: $(INSTALL_DIR)/koreader/.busted
-	cd $(INSTALL_DIR)/koreader && busted
+	cd $(INSTALL_DIR)/koreader && busted -l ./luajit
 
 test:
 	$(MAKE) -C $(KOR_BASE) test
 	$(MAKE) testfront
 
 coverage: $(INSTALL_DIR)/koreader/.luacov
-	cd $(INSTALL_DIR)/koreader && busted -c --exclude-tags=nocov
+	cd $(INSTALL_DIR)/koreader && busted -c -l ./luajit --exclude-tags=nocov
 	# coverage report summary
 	cd $(INSTALL_DIR)/koreader && tail -n \
 		+$$(($$(grep -nm1 Summary luacov.report.out|cut -d: -f1)-1)) \
diff --git a/base b/base
index 702583005..897906d91 160000
--- a/base
+++ b/base
@@ -1 +1 @@
-Subproject commit 7025830053c47496db413802375236300eaf4e6e
+Subproject commit 897906d91a3cbba0eb2aa27583a6510c99ac720d
diff --git a/frontend/httpclient.lua b/frontend/httpclient.lua
index 66043442a..d3e02df33 100644
--- a/frontend/httpclient.lua
+++ b/frontend/httpclient.lua
@@ -36,6 +36,7 @@ function HTTPClient:request(request, response_callback, error_callback)
         UIManager.INPUT_TIMEOUT = self.INPUT_TIMEOUT
         self.input_timeouts = self.input_timeouts + 1
         local turbo = require("turbo")
+        turbo.log.categories.success = false
         local res = coroutine.yield(
             turbo.async.HTTPClient():fetch(request.url, request))
         -- reset INPUT_TIMEOUT to nil when all HTTP requests are fullfilled.
diff --git a/spec/unit/commonrequire.lua b/spec/unit/commonrequire.lua
index 67c8ef4a4..e9aedbf65 100644
--- a/spec/unit/commonrequire.lua
+++ b/spec/unit/commonrequire.lua
@@ -21,25 +21,3 @@ Input.dummy = true
 -- turn on debug
 local DEBUG = require("dbg")
 --DEBUG:turnOn()
-
--- remove debug hooks in wrapped function for better luacov performance
-if LUACOV then
-    local function hook_free_call(callback)
-        local hook, mask, count = debug.gethook()
-        debug.sethook()
-        local res = callback()
-        debug.sethook(hook, mask)
-        return res
-    end
-
-    local UIManager = require("ui/uimanager")
-    local uimanager_run = UIManager.run
-    function UIManager:run()
-        hook_free_call(function() return uimanager_run(UIManager) end)
-    end
-
-    local screen_shot = Screen.shot
-    function Screen:shot(filename)
-        hook_free_call(function() return screen_shot(Screen, filename) end)
-    end
-end
diff --git a/spec/unit/httpclient_spec.lua b/spec/unit/httpclient_spec.lua
index bffb1091c..b1c3e8762 100644
--- a/spec/unit/httpclient_spec.lua
+++ b/spec/unit/httpclient_spec.lua
@@ -22,8 +22,6 @@ describe("HTTP client module", function()
         local urls = {
             "http://www.example.com",
             "http://www.example.org",
-            "https://www.example.com",
-            "https://www.example.org",
         }
         requests = #urls
         for _, url in ipairs(urls) do