diff --git a/test-requirements.txt b/test-requirements.txt
index c18b0df..a0788a2 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -87,8 +87,28 @@ pyparsing==2.4.7 \
     --hash=sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1 \
     --hash=sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b \
     # via -r ./test-requirements.txt, packaging
-pyrsistent==0.16.0 \
-    --hash=sha256:28669905fe725965daa16184933676547c5bb40a5153055a8dee2a4bd7933ad3 \
+pyrsistent==0.18.0 \
+    --hash=sha256:f4c8cabb46ff8e5d61f56a037974228e978f26bfefce4f61a4b1ac0ba7a2ab72 \
+    --hash=sha256:da6e5e818d18459fa46fac0a4a4e543507fe1110e808101277c5a2b5bab0cd2d \
+    --hash=sha256:5e4395bbf841693eaebaa5bb5c8f5cdbb1d139e07c975c682ec4e4f8126e03d2 \
+    --hash=sha256:527be2bfa8dc80f6f8ddd65242ba476a6c4fb4e3aedbf281dfbac1b1ed4165b1 \
+    --hash=sha256:2aaf19dc8ce517a8653746d98e962ef480ff34b6bc563fc067be6401ffb457c7 \
+    --hash=sha256:58a70d93fb79dc585b21f9d72487b929a6fe58da0754fa4cb9f279bb92369396 \
+    --hash=sha256:4916c10896721e472ee12c95cdc2891ce5890898d2f9907b1b4ae0f53588b710 \
+    --hash=sha256:73ff61b1411e3fb0ba144b8f08d6749749775fe89688093e1efef9839d2dcc35 \
+    --hash=sha256:b29b869cf58412ca5738d23691e96d8aff535e17390128a1a52717c9a109da4f \
+    --hash=sha256:097b96f129dd36a8c9e33594e7ebb151b1515eb52cceb08474c10a5479e799f2 \
+    --hash=sha256:772e94c2c6864f2cd2ffbe58bb3bdefbe2a32afa0acb1a77e472aac831f83427 \
+    --hash=sha256:c1a9ff320fa699337e05edcaae79ef8c2880b52720bc031b219e5b5008ebbdef \
+    --hash=sha256:cd3caef37a415fd0dae6148a1b6957a8c5f275a62cca02e18474608cb263640c \
+    --hash=sha256:e79d94ca58fcafef6395f6352383fa1a76922268fa02caa2272fff501c2fdc78 \
+    --hash=sha256:a0c772d791c38bbc77be659af29bb14c38ced151433592e326361610250c605b \
+    --hash=sha256:d5ec194c9c573aafaceebf05fc400656722793dac57f254cd4741f3c27ae57b4 \
+    --hash=sha256:6b5eed00e597b5b5773b4ca30bd48a5774ef1e96f2a45d105db5b4ebb4bca680 \
+    --hash=sha256:48578680353f41dca1ca3dc48629fb77dfc745128b56fc01096b2530c13fd426 \
+    --hash=sha256:f3ef98d7b76da5eb19c37fda834d50262ff9167c65658d1d8f974d2e4d90676b \
+    --hash=sha256:404e1f1d254d314d55adb8d87f4f465c8693d6f902f67eb6ef5b4526dc58e6ea \
+    --hash=sha256:773c781216f8c2900b42a7b638d5b517bb134ae1acbebe4d1e8f1f41ea60eb4b \
     # via -r ./test-requirements.txt, jsonschema
 pytest-cov==2.10.0 \
     --hash=sha256:1a629dc9f48e53512fcbfda6b07de490c374b0c83c55ff7a1720b3fccff0ac87 \