diff --git a/aea/package_manager/base.py b/aea/package_manager/base.py
index 96df69ce59..594adbd784 100644
--- a/aea/package_manager/base.py
+++ b/aea/package_manager/base.py
@@ -50,7 +50,7 @@
     IS_IPFS_PLUGIN_INSTALLED = False
 
 PACKAGES_FILE = "packages.json"
-PACKAGE_SOURCE_RE = re.compile(r"([a-z-_0-9]+\/[a-z-_0-9]+)((:)([a-z\.0-9_-]+))?")
+PACKAGE_SOURCE_RE = re.compile(r"([a-z-_0-9A-Z]+\/[a-z-_0-9A-Z]+)((:)([a-z\.0-9_-]+))?")
 
 PackageIdToHashMapping = OrderedDictType[PackageId, str]
 ConfigLoaderCallableType = Callable[[PackageType, Path], PackageConfiguration]