diff --git a/Makefile b/Makefile
index f02a263242..f52adb262e 100644
--- a/Makefile
+++ b/Makefile
@@ -68,15 +68,18 @@ gen: ${GEN_FILES}
 gen-clean:
 	rm -f ${GEN_FILES}
 
+check-cfbc-version:
+	test "$$($(CFBC) --version)" = 0.1.9
+
 %_generated.rs: %.fbs
 	$(FLATC) -r -o $(shell dirname $@) $<
 
-%_generated_verifier.rs: %.fbs
+%_generated_verifier.rs: %.fbs check-cfbc-version
 	$(FLATC) -b --schema -o $(shell dirname $@) $<
 	$(CFBC) -o $(shell dirname $@) $*.bfbs
 	rm -f $*.bfbs $*_builder.rs
 
-.PHONY: build prod prod-test docker gen gen-clean
+.PHONY: build prod prod-test docker gen gen-clean check-cfbc-version
 .PHONY: fmt test clippy doc doc-deps check stats
 .PHONY: ci info security-audit
 .PHONY: integration integration-release
diff --git a/shared/src/chain_state.rs b/shared/src/chain_state.rs
index e1c1065254..03f20a50c1 100644
--- a/shared/src/chain_state.rs
+++ b/shared/src/chain_state.rs
@@ -263,6 +263,10 @@ impl<CI: ChainIndex> ChainState<CI> {
             attached.extend(blk.commit_transactions().iter().skip(1).cloned())
         }
 
+        if !detached.is_empty() {
+            self.txs_verify_cache.borrow_mut().clear();
+        }
+
         let retain: Vec<&Transaction> = detached.difference(&attached).collect();
 
         for tx in retain {