From b6d3406bdfe8e5c1b44104e7fc071eb88fdfd869 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sun, 29 Nov 2020 18:30:48 +0300
Subject: update requirements.txt

---
 .github/workflows/test.yml | 8 +++++++-
 constraints.txt            | 3 +++
 requirements.txt           | 7 +++----
 3 files changed, 13 insertions(+), 5 deletions(-)
 create mode 100644 constraints.txt

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 723fa69..f64c44b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,6 +12,10 @@ jobs:
   test:
     runs-on: ubuntu-18.04
 
+    env:
+      PIP_DISABLE_PIP_VERSION_CHECK: 1
+      PIP_NO_PYTHON_VERSION_WARNING: 1
+
     strategy:
       fail-fast: false
       matrix:
@@ -29,7 +33,9 @@ jobs:
           python-version: '${{ matrix.python-version }}'
 
       - name: Install dependencies
-        run: python -m pip install -r requirements.txt
+        run: |
+          pip install -r constraints.txt
+          pip install -r requirements.txt
 
       - name: Run the tests
         run: ./.ci/bin/main.sh
diff --git a/constraints.txt b/constraints.txt
new file mode 100644
index 0000000..8a74c51
--- /dev/null
+++ b/constraints.txt
@@ -0,0 +1,3 @@
+# Numpy 1.17 dropped support for Python 3.4.
+numpy >1.11,<1.17 ; python_version == '3.4'
+numpy >=1.17 ; python_version > '3.4'
diff --git a/requirements.txt b/requirements.txt
index 8fe1f23..0e97461 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
-numpy>1.11.0
-matplotlib==1.5.1; python_version == '3.4'
-matplotlib==2.1.2; python_version == '3.5'
-matplotlib==3.1.1; python_version > '3.5'
+matplotlib ~=1.5 ; python_version == '3.4'
+matplotlib ~=2.1 ; python_version == '3.5'
+matplotlib ~=3.1 ; python_version > '3.5'
-- 
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