diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 750bf6f4cc5018fc14c9195ec688d45bea21d129..3220e44b63b7940a4f825f1c99634375d9fc7d6a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -40,7 +40,7 @@ Python 3.6 POCL Examples:
   except:
   - tags
 
-Python 3.5 Conda:
+Python 3.6 Conda:
   script:
   - export SUMPY_FORCE_SYMBOLIC_BACKEND=symengine
   - CONDA_ENVIRONMENT=.test-conda-env-py3.yml
@@ -67,7 +67,7 @@ Python 2.7 POCL:
   except:
   - tags
 
-Python 3.5 Conda Apple:
+Python 3.6 Conda Apple:
   script:
   - export LC_ALL=en_US.UTF-8
   - export LANG=en_US.UTF-8
diff --git a/.test-conda-env-py3-macos.yml b/.test-conda-env-py3-macos.yml
index 807cd6963d5328c5cbe92494f1f255cece964c4b..9d36c7805715ea70a0f1573498b6d0768370a9e4 100644
--- a/.test-conda-env-py3-macos.yml
+++ b/.test-conda-env-py3-macos.yml
@@ -9,7 +9,7 @@ dependencies:
 - pocl=1.0
 - islpy
 - pyopencl
-- python=3.5
+- python=3.6
 - symengine=0.3.0
 - python-symengine=0.3.0
 - pyfmmlib
diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index 37c60864a80724cdb1117ff6ea0398ac32e6a6cb..8d60a1f0a9b0694d8d5f62ffd1a21c4dc60ac3e1 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -9,7 +9,7 @@ dependencies:
 - pocl=1.0
 - islpy
 - pyopencl
-- python=3.5
+- python=3.6
 - symengine=0.3.0
 - python-symengine=0.3.0
 - pyfmmlib
diff --git a/requirements.txt b/requirements.txt
index 8925c34ed4f7ccd7426bf4b153b8864bc3e77106..6d1e4cceb94d1fcbff1e52cbb8b622ff2de2a1e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 numpy
 git+git://github.com/inducer/pymbolic
-sympy==1.0
+sympy==1.1.1
 git+https://github.com/inducer/modepy
 git+https://github.com/inducer/pyopencl
 git+https://github.com/inducer/islpy