diff --git a/build/premake/extern_libs5.lua b/build/premake/extern_libs5.lua
index e183fb1168..cd7292f746 100644
--- a/build/premake/extern_libs5.lua
+++ b/build/premake/extern_libs5.lua
@@ -585,7 +585,7 @@ extern_lib_defs = {
 		compile_settings = function()
 			if _OPTIONS["with-system-mozjs"] then
 				if not _OPTIONS["android"] then
-					pkgconfig.add_includes("mozjs-60")
+					pkgconfig.add_includes("mozjs-68")
 				end
 			else
 				if os.istarget("windows") then
@@ -605,15 +605,15 @@ extern_lib_defs = {
 		link_settings = function()
 			if _OPTIONS["with-system-mozjs"] then
 				if _OPTIONS["android"] then
-					links { "mozjs-60" }
+					links { "mozjs-68" }
 				else
-					pkgconfig.add_links("mozjs-60")
+					pkgconfig.add_links("mozjs-68")
 				end
 			else
 				filter { "Debug" }
-					links { "mozjs60-ps-debug" }
+					links { "mozjs68-ps-debug" }
 				filter { "Release" }
-					links { "mozjs60-ps-release" }
+					links { "mozjs68-ps-release" }
 				filter { }
 				add_source_lib_paths("spidermonkey")
 			end
diff --git a/build/workspaces/clean-workspaces.sh b/build/workspaces/clean-workspaces.sh
index 44e4e9e0ef..9795dcb616 100755
--- a/build/workspaces/clean-workspaces.sh
+++ b/build/workspaces/clean-workspaces.sh
@@ -33,14 +33,15 @@ if [ "$preserve_libs" != "true" ]; then
   (cd ../../libraries/source/fcollada/src && rm -rf ./output)
   (cd ../../libraries/source/nvtt/src && rm -rf ./build)
   (cd ../../libraries/source/spidermonkey && rm -f .already-built)
-  (cd ../../libraries/source/spidermonkey && rm -rf ./lib)
+  (cd ../../libraries/source/spidermonkey && rm -rf ./lib/*.a && rm -rf ./lib/*.so)
   (cd ../../libraries/source/spidermonkey && rm -rf ./include-unix-debug)
   (cd ../../libraries/source/spidermonkey && rm -rf ./include-unix-release)
-  (cd ../../libraries/source/spidermonkey && rm -rf ./mozjs-62.9.1)
+  (cd ../../libraries/source/spidermonkey && rm -rf ./mozjs-68.12.1)
 fi
 
 # Still delete the directory of previous SpiderMonkey versions to
 # avoid wasting disk space if people clean workspaces after updating.
+(cd ../../libraries/source/spidermonkey && rm -rf ./mozjs-62.9.1)
 (cd ../../libraries/source/spidermonkey && rm -rf ./mozjs-52.9.1pre1)
 (cd ../../libraries/source/spidermonkey && rm -rf ./mozjs-45.0.2)
 (cd ../../libraries/source/spidermonkey && rm -rf ./mozjs-38.0.0)
diff --git a/source/scriptinterface/ScriptTypes.h b/source/scriptinterface/ScriptTypes.h
index ac2dd0d58b..f0033fab86 100644
--- a/source/scriptinterface/ScriptTypes.h
+++ b/source/scriptinterface/ScriptTypes.h
@@ -73,7 +73,7 @@
 # pragma GCC diagnostic pop
 #endif
 
-#if MOZJS_MAJOR_VERSION != 60
+#if MOZJS_MAJOR_VERSION != 68
 #error Your compiler is trying to use an incorrect major version of the \
 SpiderMonkey library. The only version that works is the one in the \
 libraries/spidermonkey/ directory, and it will not work with a typical \
@@ -81,7 +81,7 @@ system-installed version. Make sure you have got all the right files and \
 include paths.
 #endif
 
-#if MOZJS_MINOR_VERSION != 9
+#if MOZJS_MINOR_VERSION != 12
 #error Your compiler is trying to use an untested minor version of the \
 SpiderMonkey library. If you are a package maintainer, please make sure \
 to check very carefully that this version does not change the behaviour \