diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b083c3e6..9da582a6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -35,6 +35,10 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
           override: true
 
+      - name: Downgrade phf to a version compatible with the MSRV
+        run: cargo update --package phf:0.11.0 --precise 0.10.1
+        if: matrix.toolchain == '1.40.0'
+
       - name: Cargo build
         run: cargo build ${{ matrix.features }}
 
diff --git a/Cargo.toml b/Cargo.toml
index 7c0b5aff..a1032966 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ cssparser-macros = {path = "./macros", version = "0.6"}
 dtoa-short = "0.3"
 itoa = "1.0"
 matches = "0.1"
-phf = {version = ">=0.8,<=0.10", features = ["macros"]}
+phf = {version = ">=0.8,<=0.11", features = ["macros"]}
 serde = {version = "1.0", optional = true}
 smallvec = "1.0"