diff --git a/Cargo.lock b/Cargo.lock
index ef29325..24771cc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -288,7 +288,6 @@ dependencies = [
  "matrix-sdk-common 0.1.0 (git+https://github.com/matrix-org/matrix-rust-sdk?rev=0.1.0)",
  "matrix-sdk-common-macros",
  "nom",
- "once_cell",
  "rand",
  "serde",
  "thiserror",
diff --git a/Cargo.toml b/Cargo.toml
index d46badc..aa826fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,6 @@ indoc = "1.0"
 actix = "0.10"
 actix-rt = "1.1"
 combine = "4.3"
-once_cell = "1.4"
 
 # The versioning of the matrix SDK follows its Cargo.toml. The SDK and
 # macros are on master, but it imports the common and base from 0.1.0.