diff --git a/langs/ceylon.yaml b/langs/ceylon.yaml
index f5f427e..3c86586 100644
--- a/langs/ceylon.yaml
+++ b/langs/ceylon.yaml
@@ -26,7 +26,7 @@ install:
     aptKey:
       - "https://downloads.ceylon-lang.org/apt/ceylon-debian-repo.gpg.key"
     aptRepo:
-      - "https://downloads.ceylon-lang.org/apt/ unstable main"
+      - "deb [arch=amd64] https://downloads.ceylon-lang.org/apt/ unstable main"
   <<: *add-ceylon-repo
   apt:
     - $(grep-aptavail -F Package ceylon -s Package -n | sort -rV | head -n1)
diff --git a/langs/crystal.yaml b/langs/crystal.yaml
index d2ada3c..bd2e72f 100644
--- a/langs/crystal.yaml
+++ b/langs/crystal.yaml
@@ -23,7 +23,7 @@ install:
   aptKey:
     - "https://keybase.io/crystal/pgp_keys.asc"
   aptRepo:
-    - "https://dist.crystal-lang.org/apt crystal main"
+    - "deb [arch=amd64] https://dist.crystal-lang.org/apt crystal main"
   apt:
     - crystal
 
diff --git a/langs/dart.yaml b/langs/dart.yaml
index be26adf..076d382 100644
--- a/langs/dart.yaml
+++ b/langs/dart.yaml
@@ -6,7 +6,7 @@ install:
   aptKey:
     - "https://dl-ssl.google.com/linux/linux_signing_key.pub"
   aptRepo:
-    - "https://storage.googleapis.com/download.dartlang.org/linux/debian stable main"
+    - "deb [arch=amd64] https://storage.googleapis.com/download.dartlang.org/linux/debian stable main"
   apt:
     - dart
 
diff --git a/langs/hack.yaml b/langs/hack.yaml
index d9c65ae..134e187 100644
--- a/langs/hack.yaml
+++ b/langs/hack.yaml
@@ -9,7 +9,7 @@ install:
   aptKey:
     - "B4112585D386EB94"
   aptRepo:
-    - "https://dl.hhvm.com/ubuntu ${ubuntu_name} main"
+    - "deb [arch=amd64] https://dl.hhvm.com/ubuntu ${ubuntu_name} main"
   apt:
     - hhvm
 
diff --git a/langs/mongodb.yaml b/langs/mongodb.yaml
index 815b814..2e85e92 100644
--- a/langs/mongodb.yaml
+++ b/langs/mongodb.yaml
@@ -8,7 +8,7 @@ name: "MongoDB"
 install:
   prepare:
     aptRepo:
-      - "http://archive.ubuntu.com/ubuntu/ focal main universe"
+      - "deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ focal main universe"
     manual: |
       for name in mongodb mongodb-clients mongodb-server mongodb-server-core; do
           apt-get download "${name}"
diff --git a/langs/r.yaml b/langs/r.yaml
index 40404da..3137f12 100644
--- a/langs/r.yaml
+++ b/langs/r.yaml
@@ -8,7 +8,7 @@ install:
   aptKey:
     - "E298A3A825C0D65DFD57CBB651716619E084DAB9"
   aptRepo:
-    - "https://cloud.r-project.org/bin/linux/ubuntu ${ubuntu_name}-$(curl -fsSL https://cran.r-project.org/bin/linux/ubuntu/ | grep -Eo 'cran[0-9]+' | head -n1)/"
+    - "deb [arch=amd64] https://cloud.r-project.org/bin/linux/ubuntu ${ubuntu_name}-$(curl -fsSL https://cran.r-project.org/bin/linux/ubuntu/ | grep -Eo 'cran[0-9]+' | head -n1)/"
   apt:
     - r-base
 
diff --git a/tools/jsonschema.yaml b/tools/jsonschema.yaml
index edc3255..c21c5fd 100644
--- a/tools/jsonschema.yaml
+++ b/tools/jsonschema.yaml
@@ -533,9 +533,9 @@ properties:
             type: array
             items:
               type: string
-              pattern: "^https?://"
+              pattern: "^deb"
               examples:
-                - "https://downloads.ceylon-lang.org/apt/ unstable main"
+                - "deb [arch=amd64] https://downloads.ceylon-lang.org/apt/ unstable main"
           apt:
             type: array
             items: