diff --git a/org.gnome.Geary.json b/org.gnome.Geary.json
index 8571139f..795afdb0 100644
--- a/org.gnome.Geary.json
+++ b/org.gnome.Geary.json
@@ -133,7 +133,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/evolution-data-server.git"
+                    "url": "https://gitlab.gnome.org/GNOME/evolution-data-server.git",
+                    "branch": "master"
                 }
             ],
             "cleanup": [
@@ -155,7 +156,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/folks.git"
+                    "url": "https://gitlab.gnome.org/GNOME/folks.git",
+                    "branch": "master"
                 }
             ],
             "cleanup": [
@@ -182,7 +184,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://github.com/GNOME/gsound.git"
+                    "url": "https://github.com/GNOME/gsound.git",
+                    "branch": "master"
                 }
             ]
         },
@@ -191,7 +194,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://github.com/jstedfast/gmime.git"
+                    "url": "https://github.com/jstedfast/gmime.git",
+                    "branch": "master"
                 }
             ]
         },
@@ -215,7 +219,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/libpeas.git"
+                    "url": "https://gitlab.gnome.org/GNOME/libpeas.git",
+                    "branch": "master"
                 }
             ]
         },
diff --git a/org.gnome.Geary.yaml b/org.gnome.Geary.yaml
index f0bbed03..e481a070 100644
--- a/org.gnome.Geary.yaml
+++ b/org.gnome.Geary.yaml
@@ -152,6 +152,7 @@ modules:
     sources:
       - type: git
         url: https://gitlab.gnome.org/GNOME/evolution-data-server.git
+        branch: master
     cleanup:
       - /lib/cmake
       - /lib/evolution-data-server/*-backends
@@ -169,6 +170,7 @@ modules:
     sources:
       - type: git
         url: https://gitlab.gnome.org/GNOME/folks.git
+        branch: master
     cleanup:
       - /bin
 
@@ -188,12 +190,14 @@ modules:
     sources:
       - type: git
         url: https://github.com/GNOME/gsound.git
+        branch: master
 
   # Geary dependency
   - name: gmime
     sources:
       - type: git
         url: https://github.com/jstedfast/gmime.git
+        branch: master
 
   # Geary dependency
   - name: libhandy
@@ -211,6 +215,7 @@ modules:
     sources:
       - type: git
         url: https://gitlab.gnome.org/GNOME/libpeas.git
+        branch: master
 
   # Geary dependency
   - name: "libytnef"
@@ -234,4 +239,3 @@ modules:
       - type: git
         url: https://gitlab.gnome.org/GNOME/geary.git
         branch: mainline
-