diff --git a/nix/drun.nix b/nix/drun.nix
index 0f0076617e9..06a2f729911 100644
--- a/nix/drun.nix
+++ b/nix/drun.nix
@@ -22,8 +22,8 @@ pkgs:
           "cloudflare-0.12.0" = "sha256-FxCAK7gUKp/63fdvzI5Ufsy4aur74fO4R/K3YFiUw0Y=";
           "ic-bn-lib-0.1.0" = "sha256-wqWfF70B+YQWg63yiEvIxOq+LN1AasrNXcyPkDM4/jw=";
           "ic-canister-sig-creation-1.1.0" = "sha256-c47Fh4kZbmezWCYVHMci2BMXJfESaOGsyNlWh8YR6oU=";
+          "ic-cdk-0.18.0-alpha.1" = "sha256-MpLZVaLyNBT4qsy9m2eJwMeISTi5UfQH/BM1PxuwY6c=";
           "icrc1-test-env-0.1.1" = "sha256-2PB7e64Owin/Eji3k8UoeWs+pfDfOOTaAyXjvjOZ/4g=";
-          "jsonrpc-0.12.1" = "sha256-3FtdZlt2PqVDkE5iKWYIp1eiIELsaYlUPRSP2Xp8ejM=";
           "lmdb-rkv-0.14.99" = "sha256-5WcUzapkrc/s3wCBNCuUDhtbp17n67rTbm2rx0qtITg=";
         };
       };
diff --git a/nix/sources.json b/nix/sources.json
index 7a359c79d61..13b52ca9786 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -26,10 +26,10 @@
         "homepage": "",
         "owner": "luc-blaeser",
         "repo": "ic",
-        "rev": "01c8dfda47126bb5f688302e0161f17c2c0cfe6f",
-        "sha256": "16h037xagxwf00k13y3h0gvfs7f3c45z2ml0j1pgvzg2fx5pzahy",
+        "rev": "ec8add504e63f97a2bc7f470d1b64dca550235af",
+        "sha256": "09dwfw78v6di4py7wwj372q1irqvh020b76yb58cbmrm6ygjg8qq",
         "type": "tarball",
-        "url": "https://github.com/luc-blaeser/ic/archive/01c8dfda47126bb5f688302e0161f17c2c0cfe6f.tar.gz",
+        "url": "https://github.com/luc-blaeser/ic/archive/ec8add504e63f97a2bc7f470d1b64dca550235af.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "ic-hs": {