diff --git a/Makefile b/Makefile
index 4e593dd5..38ef7678 100644
--- a/Makefile
+++ b/Makefile
@@ -150,22 +150,22 @@ run-valgrind-all:
 
 .PHONY: run-testvectors
 run-testvectors: test/check_testvectors.py | require_scheme
-	python3.7 test/check_testvectors.py $(SCHEME) || exit 1; \
+	python3 test/check_testvectors.py $(SCHEME) || exit 1; \
 
 .PHONY: run-symbol-namespace
 run-symbol-namespace: test/check_symbol_namespace.py | require_scheme
-	python3.7 test/check_symbol_namespace.py $(SCHEME) || exit 1; \
+	python3 test/check_symbol_namespace.py $(SCHEME) || exit 1; \
 
 .PHONY: run-testvectors-all
 run-testvectors-all: test/check_testvectors.py
 	@for scheme in $(ALL_SCHEMES); do \
-	    python3.7 test/check_testvectors.py $$scheme || exit 1; \
+	    python3 test/check_testvectors.py $$scheme || exit 1; \
 	done
 
 .PHONY: run-symbol-namespace-all
 run-symbol-namespace-all:
 	@for scheme in $(ALL_SCHEMES); do \
-	    python3.7 test/check_symbol_namespace.py $$scheme || exit 1; \
+	    python3 test/check_symbol_namespace.py $$scheme || exit 1; \
 	done
 
 .PHONY: run-functest-all
diff --git a/crypto_kem/kyber768/META.yml b/crypto_kem/kyber768/META.yml
index 4b3cafed..29186007 100644
--- a/crypto_kem/kyber768/META.yml
+++ b/crypto_kem/kyber768/META.yml
@@ -4,7 +4,8 @@ version: https://github.com/pq-crystals/kyber/commit/ab996e7460e5356b0e23aa034e7
 claimed-nist-level: 3
 length-public-key: 1088
 length-ciphertext: 1152
-testvectors-sha3-256: 0xF3D335A7C393083F11F2D9EF4D7312ADB5683139473EA9BDF0091618476BA412
+testvectors-sha3-256: f3d335a7c393083f11f2d9ef4d7312adb5683139473ea9bdf0091618476ba412
+testvectors-sha256: 0e002ee528febdab1709f100df79ceb00b31a809e03a4fb84e3a72c39235d372
 principal-submitter: Peter Schwabe
 auxiliary-submitters:
   - Roberto Avanzi
diff --git a/crypto_sign/dilithium-iii/META.yml b/crypto_sign/dilithium-iii/META.yml
index 384f54e4..1a0d95a4 100644
--- a/crypto_sign/dilithium-iii/META.yml
+++ b/crypto_sign/dilithium-iii/META.yml
@@ -4,7 +4,8 @@ version: https://github.com/pq-crystals/dilithium/commit/ffa89bdbc12a8ee178ccec4
 claimed-nist-level: 3
 length-public-key: 1472
 length-signature: 2701
-testvectors-sha3-256: 0xCE28BBD23C2AC42C7F9A17A4FA463DC9F8ACBF767397AD4ECDE136A92D4D6C3E
+testvectors-sha3-256: ce28bbd23c2ac42c7f9a17a4fa463dc9f8acbf767397ad4ecde136a92d4d6c3e
+testvectors-sha256: e1852a975842c44a683c914ed131d95bee9b786c36c41e47bb77d7dd3c0c07be
 principal-submitter: Vadim Lyubashevsky
 auxiliary-submitters:
   - Léo Ducas
diff --git a/test/check_symbol_namespace.py b/test/check_symbol_namespace.py
index a6d1d4d6..b8985a2b 100644
--- a/test/check_symbol_namespace.py
+++ b/test/check_symbol_namespace.py
@@ -13,12 +13,12 @@ if len(sys.argv) != 2:
 SCHEME = sys.argv[1]
 SCHEMEFULL = SCHEME.replace('/', '_')  # e.g. crypto_kem_kyber768
 SCHEMESHORT = SCHEME.split('/')[1].upper()
-namespace = f"PQCLEAN_{SCHEMESHORT}_".replace('-', '')
+namespace = "PQCLEAN_{}_".format(SCHEMESHORT).replace('-', '')
 
 # TODO can we do this using object files instead, to preserve file origin?
 sharedlib = "bin/shared_{}_clean.so".format(SCHEMEFULL)
 subprocess.run(["make", sharedlib, "SCHEME={}".format(SCHEME)])
-p = subprocess.run(["nm", "-D", sharedlib], capture_output=True)
+p = subprocess.run(["nm", "-D", sharedlib], stdout=subprocess.PIPE)
 
 symbols = p.stdout.decode('utf-8').strip().split("\n")
 non_namespaced = []
diff --git a/test/check_testvectors.py b/test/check_testvectors.py
index 65c1e2b5..4d473cd8 100644
--- a/test/check_testvectors.py
+++ b/test/check_testvectors.py
@@ -21,7 +21,7 @@ SCHEMESHORT = SCHEME.split('/')[1].upper()
 def get_hash(scheme):
     with open("{}/META.yml".format(scheme), 'r') as stream:
         meta = yaml.load(stream)
-        return hex(meta['testvectors-sha3-256']).replace('0x', '')
+        return meta['testvectors-sha256']
 
 
 expectedTestvectorsHash = get_hash(SCHEME)
@@ -33,7 +33,7 @@ implementations = [
 for impl in implementations:
     testvectors = subprocess.run(["bin/{}".format(impl)],
                                  stdout=subprocess.PIPE)
-    testvectorsHash = hashlib.sha3_256(testvectors.stdout).hexdigest()
+    testvectorsHash = hashlib.sha256(testvectors.stdout).hexdigest()
     if testvectorsHash.lower() != expectedTestvectorsHash.lower():
         print("testvectors of {} should be {}, but is {}"
               .format(SCHEME, expectedTestvectorsHash, testvectorsHash))