diff --git a/pyproject.toml b/pyproject.toml
index f377800da..bf54d52ee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,10 @@ azure = ["azure-identity>=1.16.0", "PyJWT>=2.12.0"]
 code-mode = ["pydantic-monty==0.0.9"]
 gemini = ["google-genai>=1.18.0"]
 openai = ["openai>=1.102.0"]
-tasks = ["pydocket>=0.18.0"]
+# fakeredis 2.35.0 renamed FakeConnection, which breaks pydocket's memory://
+# backend. Remove the ceiling once a fixed pydocket release ships.
+# See https://github.com/chrisguidry/docket/pull/382
+tasks = ["pydocket>=0.18.0", "fakeredis[lua]<2.35.0"]
 
 [dependency-groups]
 dev = [
diff --git a/uv.lock b/uv.lock
index 191517ffd..479c6aa21 100644
--- a/uv.lock
+++ b/uv.lock
@@ -827,6 +827,7 @@ openai = [
     { name = "openai" },
 ]
 tasks = [
+    { name = "fakeredis", extra = ["lua"] },
     { name = "pydocket" },
 ]
 
@@ -868,6 +869,7 @@ requires-dist = [
     { name = "azure-identity", marker = "extra == 'azure'", specifier = ">=1.16.0" },
     { name = "cyclopts", specifier = ">=4.0.0" },
     { name = "exceptiongroup", specifier = ">=1.2.2" },
+    { name = "fakeredis", extras = ["lua"], marker = "extra == 'tasks'", specifier = "<2.35.0" },
     { name = "google-genai", marker = "extra == 'gemini'", specifier = ">=1.18.0" },
     { name = "httpx", specifier = ">=0.28.1,<1.0" },
     { name = "jsonref", specifier = ">=1.1.0" },