diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1bf4dde..905add6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -107,8 +107,14 @@ jobs:
     runs-on: ubuntu-22.04
     needs: [rust-build-programs]
 
+    strategy:
+      fail-fast: false
+      matrix:
+        ghc:
+          - "9.0.2"
+
     container:
-      image: ghcr.io/clash-lang/clash-ci-9.0.2:2022-12-13
+      image: ghcr.io/clash-lang/clash-ci:${{ matrix.ghc }}-20240221
 
     steps:
       - name: Checkout
@@ -124,8 +130,8 @@ jobs:
         with:
           path: |
             ~/.cabal/store
-          key: packages-cachebust-1-${{ hashFiles('cabal.project.freeze', 'cabal.project') }}
-          restore-keys: packages-cachebust-1-
+          key: packages-cachebust-2-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze', 'cabal.project') }}
+          restore-keys: packages-cachebust-2-${{ matrix.ghc }}
 
       - name: Install build deps
         run: |
diff --git a/clash-vexriscv/Makefile b/clash-vexriscv/Makefile
index 49f7cf0..db1a711 100644
--- a/clash-vexriscv/Makefile
+++ b/clash-vexriscv/Makefile
@@ -40,13 +40,17 @@ $(OUT_DIR)/impl.o: $(FFI_DIR)/impl.cpp $(FFI_DIR)/interface.h
 $(OUT_DIR)/verilated.o: $(shell pkg-config --variable=includedir verilator)/verilated.cpp
 	$(CXX) $(FFI_CPPFLAGS) -c $(shell pkg-config --variable=includedir verilator)/verilated.cpp -o $(OUT_DIR)/verilated.o
 
+$(OUT_DIR)/verilated_threads.o: $(shell pkg-config --variable=includedir verilator)/verilated_threads.cpp
+	$(CXX) $(FFI_CPPFLAGS) -c $(shell pkg-config --variable=includedir verilator)/verilated_threads.cpp -o $(OUT_DIR)/verilated_threads.o
+
 $(OUT_DIR)/VVexRiscv__ALL.a: $(VERILATOR_DIR)/VVexRiscv__ALL.a
 	cp $(VERILATOR_DIR)/VVexRiscv__ALL.a $(OUT_DIR)/VVexRiscv__ALL.a
 
-$(OUT_DIR)/libVexRiscvFFI.a: $(OUT_DIR)/VVexRiscv__ALL.a $(OUT_DIR)/impl.o $(OUT_DIR)/verilated.o
+$(OUT_DIR)/libVexRiscvFFI.a: $(OUT_DIR)/VVexRiscv__ALL.a $(OUT_DIR)/impl.o $(OUT_DIR)/verilated.o $(OUT_DIR)/verilated_threads.o
 	rm -f $(OUT_DIR)/libVexRiscvFFI.a
 	cp $(OUT_DIR)/VVexRiscv__ALL.a $(OUT_DIR)/libVexRiscvFFI.a
 	ar r \
 		$(OUT_DIR)/libVexRiscvFFI.a \
 		$(OUT_DIR)/impl.o \
-		$(OUT_DIR)/verilated.o
+		$(OUT_DIR)/verilated.o \
+		$(OUT_DIR)/verilated_threads.o