diff --git a/package.json b/package.json
index e739190a3a..837f54f870 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "pg": ">=6.1.0 <8",
     "pg-connection-string": "^0.1.3",
     "pg-sql2": "^2.2.1",
-    "postgraphile-core": "4.1.0-rc.0",
+    "postgraphile-core": "4.1.0-rc.2",
     "tslib": "^1.5.0"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 4df8b26bef..2edf25bebc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3299,43 +3299,44 @@ graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.6:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
   integrity sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=
 
-graphile-build-pg@4.1.0-rc.0:
-  version "4.1.0-rc.0"
-  resolved "https://registry.yarnpkg.com/graphile-build-pg/-/graphile-build-pg-4.1.0-rc.0.tgz#86f402fa68d36119d773444c8e19159231b4b89f"
-  integrity sha512-Hni0DnSaxMcziucpFyFbSjfWuG0IfJc4CPAYZLp8b4BwsxuZXB8Cwicc8dG8hZKFigUe2J2VHdKm11xQ1PBb9Q==
+graphile-build-pg@4.1.0-rc.2:
+  version "4.1.0-rc.2"
+  resolved "https://registry.yarnpkg.com/graphile-build-pg/-/graphile-build-pg-4.1.0-rc.2.tgz#b059e8f22bcb96bd04820c217cb6dc463fa1fc27"
+  integrity sha512-n3d1rFncSVqNZSzWOhog21/E67M2o8T0ppVQBNgvCOec+byKy++6nBKUoxzhVyxNyzAYwY7Y9oySXgiKnajyoA==
   dependencies:
     chalk "^2.1.0"
     debug ">=2 <3"
-    graphile-build "4.1.0-rc.0"
-    graphql-iso-date "^3.2.0"
+    graphile-build "4.1.0-rc.2"
+    graphql-iso-date "^3.6.0"
     jsonwebtoken "^8.1.1"
     lodash ">=4 <5"
     lru-cache ">=4 <5"
     pg-sql2 "2.2.1"
     postgres-interval "^1.1.1"
 
-graphile-build@4.1.0-rc.0:
-  version "4.1.0-rc.0"
-  resolved "https://registry.yarnpkg.com/graphile-build/-/graphile-build-4.1.0-rc.0.tgz#e0442dac3c265e343e0758a52d52809eb0c1c149"
-  integrity sha512-LoNpLkZwM5j8Tb/GtWNtUu9bACFRLpZS5jrU3dpEalmrA1UCrr8V3ygDN/uAU29+c5/Zo89ZE4OpyM+QnPspfw==
+graphile-build@4.1.0-rc.2:
+  version "4.1.0-rc.2"
+  resolved "https://registry.yarnpkg.com/graphile-build/-/graphile-build-4.1.0-rc.2.tgz#71749419a92d2126eff1bddb72f1b6169494fed8"
+  integrity sha512-pNRvAWerwDmRGJP7alyevUum/K9fBkJcH3oQb9gEo0R0TVFEId5T4Ccfq5wc0vogazEvJ7oSyNN4PIryPDHbbw==
   dependencies:
     "@types/graphql" "^14.0.3"
     chalk "^2.1.0"
     debug ">=2 <3"
-    graphql-parse-resolve-info "4.1.0-rc.0"
+    graphql-parse-resolve-info "4.1.0-rc.2"
     lodash ">=4 <5"
     lru-cache ">=4 <5"
     pluralize "^7.0.0"
+    semver "^5.6.0"
 
-graphql-iso-date@^3.2.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/graphql-iso-date/-/graphql-iso-date-3.5.0.tgz#55a1be0efa8d28c1453afd2eb5ce1d052189a513"
-  integrity sha512-xs+8agn0OPzbiQf91aoyiZ3xC/oq4q/iJ4q1yY7hD0mbgcYBrqnZ4R+ycBZLGdb84rON1wNfqY4BDMyQG50OOg==
+graphql-iso-date@^3.6.0:
+  version "3.6.1"
+  resolved "https://registry.yarnpkg.com/graphql-iso-date/-/graphql-iso-date-3.6.1.tgz#bd2d0dc886e0f954cbbbc496bbf1d480b57ffa96"
+  integrity sha512-AwFGIuYMJQXOEAgRlJlFL4H1ncFM8n8XmoVDTNypNOZyQ8LFDG2ppMFlsS862BSTCDcSUfHp8PD3/uJhv7t59Q==
 
-graphql-parse-resolve-info@4.1.0-rc.0:
-  version "4.1.0-rc.0"
-  resolved "https://registry.yarnpkg.com/graphql-parse-resolve-info/-/graphql-parse-resolve-info-4.1.0-rc.0.tgz#24a4c676497c615055fe80b5fdfe0d66838055d6"
-  integrity sha512-5G45E8FyJ357xNG8wkiGdK5THpnp55OHLjMSYh9wUiAC8AP74PpwT00TNe/uT4GUDvvmKLQ5djEw3VzjZpfAYQ==
+graphql-parse-resolve-info@4.1.0-rc.2:
+  version "4.1.0-rc.2"
+  resolved "https://registry.yarnpkg.com/graphql-parse-resolve-info/-/graphql-parse-resolve-info-4.1.0-rc.2.tgz#e93ef370f9c7b5caa1712ea3dfa3090944887383"
+  integrity sha512-t7HmxMfCddgaBONr/Ss8jtaZd+4nkX5LkEkVfTZR59XeR03XFUkXBvz/4gMm/luN1z5Rxv6FRsIu1JKOK6Fu4g==
   dependencies:
     "@types/graphql" "^14.0.3"
     debug ">=2 <3"
@@ -5740,14 +5741,14 @@ postcss@^6.0.1, postcss@^6.0.23:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postgraphile-core@4.1.0-rc.0:
-  version "4.1.0-rc.0"
-  resolved "https://registry.yarnpkg.com/postgraphile-core/-/postgraphile-core-4.1.0-rc.0.tgz#9a4e68f2431fe7f6b18dfadbae0caca870c1704d"
-  integrity sha512-X92GIDGyFNApWGprChDJ8XWU1fuATXUk/+J5qU4rLP8VXWZL4npzezQapAx7L59i1y554H9a+haXFeWtvUM3uQ==
+postgraphile-core@4.1.0-rc.2:
+  version "4.1.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postgraphile-core/-/postgraphile-core-4.1.0-rc.2.tgz#780cb09b6f4404308343616396d0221186412031"
+  integrity sha512-XMMBBsHTUp4ge+b2FCoknICFwQyRZpgJJOyKrFR0xPIulNY3V0CBq90yzXvPFXfmU68GjuR1eAMR9//0I6FSWw==
   dependencies:
     "@types/graphql" "^14.0.3"
-    graphile-build "4.1.0-rc.0"
-    graphile-build-pg "4.1.0-rc.0"
+    graphile-build "4.1.0-rc.2"
+    graphile-build-pg "4.1.0-rc.2"
 
 postgres-array@~1.0.0:
   version "1.0.2"
@@ -6377,6 +6378,11 @@ semver@4.3.2:
   resolved "https://registry.yarnpkg.com/semver/-/semver-4.3.2.tgz#c7a07158a80bedd052355b770d82d6640f803be7"
   integrity sha1-x6BxWKgL7dBSNVt3DYLWZA+AO+c=
 
+semver@^5.6.0:
+  version "5.6.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.6.0.tgz#7e74256fbaa49c75aa7c7a205cc22799cac80004"
+  integrity sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==
+
 send@0.16.2:
   version "0.16.2"
   resolved "https://registry.yarnpkg.com/send/-/send-0.16.2.tgz#6ecca1e0f8c156d141597559848df64730a6bbc1"