diff --git a/SConscript b/SConscript
index 3054a82..f5bf805 100644
--- a/SConscript
+++ b/SConscript
@@ -140,12 +140,19 @@ AddOption(
     default = 'auto'
 )
 
+AddOption(
+    '--update_repositories',
+    dest = 'update_repositories',
+    action = 'store_true'
+)
+
 build_type      = GetOption('build_type')
 unity_mode      = GetOption('unity_mode')
 variant         = GetOption('variant')
 enable_asan     = GetOption('enable_asan')
 config_file     = GetOption('config_file')
 compiler        = GetOption('compiler')
+update_repositories = GetOption('update_repositories')
 
 default_CC = {
     'gcc': 'gcc',
@@ -170,6 +177,7 @@ env = Environment(tools = ['default', 'compilation_db', 'unity_build'], variable
 env['RECIPES_FOLDERS'] = [Dir('recipes')]
 env['SYSTEM_CACHE_DIR'] = os.path.join(_find_system_cache_dir(), 'spp_cache')
 env['CLONE_DIR'] = os.path.join(env['SYSTEM_CACHE_DIR'], 'cloned')
+env['UPDATE_REPOSITORIES'] = update_repositories
 
 print(f'Detected system cache directory: {env["SYSTEM_CACHE_DIR"]}')
 try:
diff --git a/recipes/GitBranch/recipe.py b/recipes/GitBranch/recipe.py
index 03bed71..a23be8b 100644
--- a/recipes/GitBranch/recipe.py
+++ b/recipes/GitBranch/recipe.py
@@ -11,15 +11,23 @@ def cook(env: Environment, repo_name: str, remote_url: str, git_ref: str = "main
         repo = Repo(repo_dir)
         origin = repo.remotes['origin']
     except GitError:
-        print(f'Initializing git repository for SDL at {repo_dir}.')
+        print(f'Initializing git repository at {repo_dir}.')
         repo = Repo.init(repo_dir, bare=True)
         origin = repo.create_remote('origin', remote_url)
-    worktree_dir = os.path.join(env['CLONE_DIR'], 'git', repo_name, hashlib.shake_128(git_ref.encode('utf-8')).hexdigest(6)) # TODO: commit hash would be better, right?
+    worktree_dir = os.path.join(env['CLONE_DIR'], 'git', repo_name, hashlib.shake_128(git_ref.encode('utf-8')).hexdigest(6)) # TODO: commit hash would be better, right? -> not if it's a branch!
     if not os.path.exists(worktree_dir):
         print(f'Checking out into {worktree_dir}.')
         origin.fetch()
         os.makedirs(worktree_dir)
         repo.git.worktree('add', worktree_dir, git_ref)
+    elif env['UPDATE_REPOSITORIES']:
+        worktree_repo = Repo(worktree_dir)
+        if not worktree_repo.head.is_detached:
+            print(f'Updating git repository at {worktree_dir}')
+            worktree_origin = worktree_repo.remotes['origin']
+            worktree_origin.pull()
+        else:
+            print(f'Not updating git repository {worktree_dir} as it is not on a branch.')
     return {
         'checkout_root': worktree_dir
     }
diff --git a/recipes/criterion/recipe.py b/recipes/criterion/recipe.py
new file mode 100644
index 0000000..c394c8e
--- /dev/null
+++ b/recipes/criterion/recipe.py
@@ -0,0 +1,35 @@
+
+import os
+import subprocess
+import sys
+from SCons.Script import *
+
+def cook(env: Environment, git_ref: str = "master") -> dict:
+    repo = env.Cook('GitBranch', repo_name = 'criterion', remote_url = 'https://github.com/Snaipe/Criterion.git', git_ref = git_ref)
+    checkout_root = repo['checkout_root']
+
+    config = env['BUILD_TYPE']
+    build_dir = os.path.join(checkout_root, f'build_{config}')
+    install_dir = os.path.join(checkout_root, f'install_{config}')
+    lib_fname = 'libcriterion.a' # TODO: who cares about windows?
+    is_built = os.path.exists(os.path.join(install_dir, 'lib', lib_fname)) # TODO!
+    if not is_built:
+        print(f'Building Criterion, config {config}')
+        os.makedirs(build_dir, exist_ok=True)
+        build_type = {
+            'debug': 'debug',
+            'release_debug': 'debugoptimized',
+            'release': 'release',
+            'profile': 'debugoptimized'
+        }.get(env['BUILD_TYPE'], 'debugoptimized')
+        subprocess.run(['meson', 'setup', '--prefix', install_dir, '--buildtype', build_type, build_dir, checkout_root], stdout=sys.stdout, stderr=sys.stderr, check=True)
+        subprocess.run(['meson', 'install', '-C', build_dir], stdout=sys.stdout, stderr=sys.stderr, check=True)
+    
+
+    lib_name = 'criterion'
+    return {
+        'LIBPATH': [os.path.join(install_dir, 'lib')],
+        'CPPPATH': [os.path.join(install_dir, 'include')],
+        'LIBS': [lib_name]
+    }
+