diff --git a/package.json b/package.json
index 838002b..216cd94 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@graphprotocol/graph-cli": "^0.18.0",
-    "@graphprotocol/graph-ts": "^0.18.1"
+    "@graphprotocol/graph-ts": "^0.20.0"
   },
   "devDependencies": {
     "@commitlint/cli": "^11.0.0",
diff --git a/yarn.lock b/yarn.lock
index 424588d..7441bce 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -210,10 +210,10 @@
   optionalDependencies:
     keytar "^5.0.0"
 
-"@graphprotocol/graph-ts@^0.18.1":
-  version "0.18.1"
-  resolved "https://registry.yarnpkg.com/@graphprotocol/graph-ts/-/graph-ts-0.18.1.tgz#6aadeb3e6c01f4373978bd7dd4409305ba64ffce"
-  integrity sha512-vwDZjsnHlRKg8vdR+bfPdHwDixf0ozY6FU9CyVjrGLQpsEEISoNwsSCriUXE4Wv57LhmZEl8Ce3dhiPoqsv9tg==
+"@graphprotocol/graph-ts@^0.20.0":
+  version "0.20.0"
+  resolved "https://registry.yarnpkg.com/@graphprotocol/graph-ts/-/graph-ts-0.20.0.tgz#ed31ffd59a6aa9703a1ec5079f137a81220443cb"
+  integrity sha512-+R0Tu/MD4Fiq0Fo+v1l+xznz+ZrciQKWlzMtXjDrhM70vlMNVL9wDmf90MVFYpslgqIfw024hT6XwlmyNyOWbQ==
   dependencies:
     assemblyscript "https://github.com/AssemblyScript/assemblyscript#36040d5b5312f19a025782b5e36663823494c2f3"
 
@@ -561,6 +561,18 @@ asn1@~0.2.3:
   dependencies:
     safer-buffer "~2.1.0"
 
+"assemblyscript@git+https://github.com/AssemblyScript/assemblyscript.git#36040d5b5312f19a025782b5e36663823494c2f3":
+  version "0.6.0"
+  uid "36040d5b5312f19a025782b5e36663823494c2f3"
+  resolved "git+https://github.com/AssemblyScript/assemblyscript.git#36040d5b5312f19a025782b5e36663823494c2f3"
+  dependencies:
+    "@protobufjs/utf8" "^1.1.0"
+    binaryen "77.0.0-nightly.20190407"
+    glob "^7.1.3"
+    long "^4.0.0"
+    opencollective-postinstall "^2.0.0"
+    source-map-support "^0.5.11"
+
 "assemblyscript@https://github.com/AssemblyScript/assemblyscript#36040d5b5312f19a025782b5e36663823494c2f3":
   version "0.6.0"
   resolved "https://github.com/AssemblyScript/assemblyscript#36040d5b5312f19a025782b5e36663823494c2f3"