diff --git a/Cartfile b/Cartfile
index 013beea..0532be5 100644
--- a/Cartfile
+++ b/Cartfile
@@ -1,4 +1,4 @@
-github "readium/r2-shared-swift" "master"
+github "readium/r2-shared-swift" == 1.2.8
 github "stephencelis/SQLite.swift" == 0.11.5
 github "krzyzanowskim/CryptoSwift" == 0.15.0
-github "weichsel/ZIPFoundation" == 0.9.8
\ No newline at end of file
+github "weichsel/ZIPFoundation" == 0.9.8
diff --git a/Cartfile.resolved b/Cartfile.resolved
index 807875e..3676d0d 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,4 +1,4 @@
 github "krzyzanowskim/CryptoSwift" "0.15.0"
-github "readium/r2-shared-swift" "522e818b4fc06614b46aefddbca23ae52ad01d6e"
+github "readium/r2-shared-swift" "1.2.8"
 github "stephencelis/SQLite.swift" "0.11.5"
 github "weichsel/ZIPFoundation" "0.9.8"