diff --git a/.github/workflows/go-examples.yml b/.github/workflows/go-examples.yml
index e4352cf2..08583f48 100644
--- a/.github/workflows/go-examples.yml
+++ b/.github/workflows/go-examples.yml
@@ -33,5 +33,4 @@ jobs:
         ./bin/sobol
         ./bin/cmaes_blackhole
         ./bin/simple_tpe
-        ./bin/concurrency
         ./bin/trialnotify
diff --git a/_examples/build.sh b/_examples/build.sh
index 3ddac750..890af2a1 100755
--- a/_examples/build.sh
+++ b/_examples/build.sh
@@ -10,11 +10,11 @@ set -ex
 
 go build -o ${BIN_DIR}/cmaes ${DIR}/cmaes/main.go
 go build -o ${BIN_DIR}/cmaes_blackhole ${DIR}/cmaes/blackhole/main.go
-go build -o ${BIN_DIR}/concurrency ${DIR}/concurrency/main.go
 go build -o ${BIN_DIR}/enqueue_trial ${DIR}/enqueue_trial/main.go
 go build -o ${BIN_DIR}/trialnotify ${DIR}/trialnotify/main.go
 go build -o ${BIN_DIR}/signalhandling ${DIR}/signalhandling/main.go
 go build -o ${BIN_DIR}/simple_rdb ${DIR}/simple_rdb/main.go
 go build -o ${BIN_DIR}/simple_tpe ${DIR}/simple_tpe/main.go
 go build -o ${BIN_DIR}/sobol ${DIR}/sobol/main.go
-go build -o ${BIN_DIR}/gorgonia_iris ${DIR}/gorgonia_iris/main.go
+#go build -o ${BIN_DIR}/concurrency ${DIR}/concurrency/main.go
+#go build -o ${BIN_DIR}/gorgonia_iris ${DIR}/gorgonia_iris/main.go