diff --git a/emsdk b/emsdk
index 6eda2ee..18eaccc 100755
--- a/emsdk
+++ b/emsdk
@@ -1459,11 +1459,14 @@ def find_used_python():
       return t
   return None
 
-def is_version_at_least(ver, target):
-  ver = ver.split('.')
-  target = target.split('.')
+# Performs a ver >= target comparison
+def is_version_equal_or_newer(ver, target):
+  ver = ver.replace('-', '.').replace('_', '.').split('.')
+  target = target.replace('-', '.').replace('_', '.').split('.')
   while len(ver) < len(target):
     ver += ['0']
+  while len(target) < len(ver):
+    target += ['0']
   for i in range(len(ver)):
     if int(ver[i]) < int(target[i]):
       return False
@@ -1471,9 +1474,29 @@ def is_version_at_least(ver, target):
       return True
   return True
 
+# Tests ver < target
+def is_version_strictly_older_than(ver, target):
+  return not is_version_equal_or_newer(ver, target)
+
+# Tests ver <= target
+def is_version_equal_or_older(ver, target):
+  return is_version_equal_or_newer(target, ver)
+
+# Tests ver > target
+def is_version_strictly_newer_than(ver, target):
+  return not is_version_strictly_older_than(target, ver)
+
+# Performs a ver == target comparison
+def is_version_equal(ver, target):
+  return is_version_equal_or_newer(ver, target) and is_version_equal_or_newer(target, ver)
+
+# Performs a ver != target comparison
+def is_version_not_equal(ver, target):
+  return not is_version_equal_or_newer(ver, target) or not is_version_equal_or_newer(target, ver)
+
 def version_compare(x, y):
-  a = 1 if is_version_at_least(x, y) else 0
-  b = 1 if is_version_at_least(y, x) else 0
+  a = 1 if is_version_equal_or_newer(x, y) else 0
+  b = 1 if is_version_equal_or_newer(y, x) else 0
   return a - b
 
 # A sort function that is compatible with both Python 2 and Python 3 using a custom comparison function.
@@ -1506,7 +1529,7 @@ def fetch_emscripten_tags():
   for t in tags.split('\n'):
     try:
       t = t[t.index('refs/tags/') + len('refs/tags/'):].strip()
-      if is_version_at_least(t, '1.28.2'):
+      if is_version_equal_or_newer(t, '1.28.2'):
         all_tags += [t]
     except:
       pass
@@ -1673,6 +1696,21 @@ def load_sdk_manifest():
       if not tool: return False
     return True
 
+  def cmp_version(ver, cmp_operand, reference):
+    if cmp_operand == '<=': return is_version_equal_or_older(ver, reference)
+    if cmp_operand == '<': return is_version_strictly_older_than(ver, reference)
+    if cmp_operand == '>=': return is_version_equal_or_newer(ver, reference)
+    if cmp_operand == '>': return is_version_strictly_newer_than(ver, reference)
+    if cmp_operand == '==': return is_version_equal(ver, reference)
+    if cmp_operand == '!=': return is_version_not_equal(ver, reference)
+    raise Exception('Invalid cmp_operand "' + cmp_operand + '"!')
+
+  def passes_filters(param, ver, filters):
+    for v in filters:
+      if v[0] == param and not cmp_version(ver, v[1], v[2]):
+        return False
+    return True
+
   # A 'category parameter' is a %foo%-encoded identifier that specifies
   # a class of tools instead of just one tool, e.g. %tag% or %nightly..%
   def expand_category_param(param, category_list, t, is_sdk):
@@ -1687,6 +1725,11 @@ def load_sdk_manifest():
       t2.is_old = i < len(category_list) - 2
       if hasattr(t2, 'uses'):
         t2.uses = list(map((lambda x: x.replace(param, ver)), t2.uses))
+
+      # Filter out expanded tools by version requirements, such as ["tag", "<=", "1.37.22"]
+      if hasattr(t, 'version_filter') and not passes_filters(param, ver, t.version_filter):
+          continue
+
       if is_sdk:
         if dependencies_exist(t2):
           sdks.append(t2)
diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index a611c20..da1c3a5 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -414,6 +414,24 @@
     "activated_env": "JAVA_HOME=%installation_dir%",
     "activated_cfg": "JAVA='%installation_dir%/bin/java%.exe%'"
   },
+  {
+    "id": "java",
+    "version": "8.152",
+    "bitness": 32,
+    "windows_url": "portable_jre_8_update_152_32bit.zip",
+    "activated_path": "%installation_dir%/bin",
+    "activated_env": "JAVA_HOME=%installation_dir%",
+    "activated_cfg": "JAVA='%installation_dir%/bin/java%.exe%'"
+  },
+  {
+    "id": "java",
+    "version": "8.152",
+    "bitness": 64,
+    "windows_url": "portable_jre_8_update_152_64bit.zip",
+    "activated_path": "%installation_dir%/bin",
+    "activated_env": "JAVA_HOME=%installation_dir%",
+    "activated_cfg": "JAVA='%installation_dir%/bin/java%.exe%'"
+  },
   {
     "id": "spidermonkey",
     "version": "27.0.1",
@@ -911,13 +929,13 @@
   {
     "version": "incoming",
     "bitness": 32,
-    "uses": ["clang-incoming-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-7.45-32bit", "emscripten-incoming-32bit"],
+    "uses": ["clang-incoming-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-8.152-32bit", "emscripten-incoming-32bit"],
     "os": "win"
   },
   {
     "version": "incoming",
     "bitness": 64,
-    "uses": ["clang-incoming-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-7.45-64bit", "emscripten-incoming-64bit"],
+    "uses": ["clang-incoming-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-8.152-64bit", "emscripten-incoming-64bit"],
     "os": "win"
   },
   {
@@ -941,13 +959,13 @@
   {
     "version": "master",
     "bitness": 32,
-    "uses": ["clang-master-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-7.45-32bit", "emscripten-master-32bit"],
+    "uses": ["clang-master-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-8.152-32bit", "emscripten-master-32bit"],
     "os": "win"
   },
   {
     "version": "master",
     "bitness": 64,
-    "uses": ["clang-master-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-7.45-64bit", "emscripten-master-64bit"],
+    "uses": ["clang-master-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-8.152-64bit", "emscripten-master-64bit"],
     "os": "win"
   },
   {
@@ -972,13 +990,37 @@
     "version": "tag-%tag%",
     "bitness": 32,
     "uses": ["clang-tag-e%tag%-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-7.45-32bit", "emscripten-tag-%tag%-32bit"],
-    "os": "win"
+    "os": "win",
+    "version_filter": [
+      ["%tag%", "<=", "1.37.22"]
+    ]
   },
   {
     "version": "tag-%tag%",
     "bitness": 64,
     "uses": ["clang-tag-e%tag%-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-7.45-64bit", "emscripten-tag-%tag%-64bit"],
-    "os": "win"
+    "os": "win",
+    "version_filter": [
+      ["%tag%", "<=", "1.37.22"]
+    ]
+  },
+  {
+    "version": "tag-%tag%",
+    "bitness": 32,
+    "uses": ["clang-tag-e%tag%-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-8.152-32bit", "emscripten-tag-%tag%-32bit"],
+    "os": "win",
+    "version_filter": [
+      ["%tag%", ">", "1.37.22"]
+    ]
+  },
+  {
+    "version": "tag-%tag%",
+    "bitness": 64,
+    "uses": ["clang-tag-e%tag%-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-8.152-64bit", "emscripten-tag-%tag%-64bit"],
+    "os": "win",
+    "version_filter": [
+      ["%tag%", ">", "1.37.22"]
+    ]
   },
   {
     "version": "tag-%tag%",
@@ -996,13 +1038,37 @@
     "version": "nightly-%nightly-llvm-32bit%",
     "bitness": 32,
     "uses": ["clang-nightly-e%nightly-llvm-32bit%-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-7.45-32bit", "emscripten-nightly-%nightly-llvm-32bit%"],
-    "os": "win"
+    "os": "win",
+    "version_filter": [
+      ["%nightly-llvm-32bit%", "<=", "1.37.22-2017_11_05"]
+    ]
   },
   {
     "version": "nightly-%nightly-llvm-64bit%",
     "bitness": 64,
     "uses": ["clang-nightly-e%nightly-llvm-64bit%-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-7.45-64bit", "emscripten-nightly-%nightly-llvm-64bit%"],
-    "os": "win"
+    "os": "win",
+    "version_filter": [
+      ["%nightly-llvm-64bit%", "<=", "1.37.22-2017_11_05"]
+    ]
+  },
+  {
+    "version": "nightly-%nightly-llvm-32bit%",
+    "bitness": 32,
+    "uses": ["clang-nightly-e%nightly-llvm-32bit%-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-8.152-32bit", "emscripten-nightly-%nightly-llvm-32bit%"],
+    "os": "win",
+    "version_filter": [
+      ["%nightly-llvm-32bit%", ">", "1.37.22-2017_11_05"]
+    ]
+  },
+  {
+    "version": "nightly-%nightly-llvm-64bit%",
+    "bitness": 64,
+    "uses": ["clang-nightly-e%nightly-llvm-64bit%-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-8.152-64bit", "emscripten-nightly-%nightly-llvm-64bit%"],
+    "os": "win",
+    "version_filter": [
+      ["%nightly-llvm-64bit%", ">", "1.37.22-2017_11_05"]
+    ]
   },
   {
     "version": "nightly-%nightly-llvm-32bit%",
@@ -1321,13 +1387,37 @@
     "version": "%precompiled_tag32%",
     "bitness": 32,
     "uses": ["clang-e%precompiled_tag32%-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-7.45-32bit", "emscripten-%precompiled_tag32%"],
-    "os": "win"
+    "os": "win",
+    "version_filter": [
+      ["%precompiled_tag32%", "<=", "1.37.22"]
+    ]
   },
   {
     "version": "%precompiled_tag64%",
     "bitness": 64,
     "uses": ["clang-e%precompiled_tag64%-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-7.45-64bit", "emscripten-%precompiled_tag64%"],
-    "os": "win"
+    "os": "win",
+    "version_filter": [
+      ["%precompiled_tag64%", "<=", "1.37.22"]
+    ]
+  },
+  {
+    "version": "%precompiled_tag32%",
+    "bitness": 32,
+    "uses": ["clang-e%precompiled_tag32%-32bit", "node-4.1.1-32bit", "python-2.7.5.3-32bit", "java-8.152-32bit", "emscripten-%precompiled_tag32%"],
+    "os": "win",
+    "version_filter": [
+      ["%precompiled_tag32%", ">", "1.37.22"]
+    ]
+  },
+  {
+    "version": "%precompiled_tag64%",
+    "bitness": 64,
+    "uses": ["clang-e%precompiled_tag64%-64bit", "node-4.1.1-64bit", "python-2.7.5.3-64bit", "java-8.152-64bit", "emscripten-%precompiled_tag64%"],
+    "os": "win",
+    "version_filter": [
+      ["%precompiled_tag64%", ">", "1.37.22"]
+    ]
   },
   {
     "version": "%precompiled_tag32%",