diff --git a/Cargo.lock b/Cargo.lock
index 3c78346c17..1b5de271e1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -368,11 +368,6 @@ dependencies = [
  "regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "fnv"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "fs_extra"
 version = "1.1.0"
@@ -873,8 +868,6 @@ dependencies = [
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rusty-fork 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1351,17 +1344,6 @@ dependencies = [
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "rusty-fork"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "wait-timeout 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "ryu"
 version = "0.2.7"
@@ -1811,14 +1793,6 @@ name = "version_check"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "wait-timeout"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "walkdir"
 version = "2.2.7"
@@ -1930,7 +1904,6 @@ dependencies = [
 "checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a2df5c1a8c4be27e7707789dc42ae65976e60b394afd293d1419ab915833e646"
 "checksum flexi_logger 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4a7878fc9e06c948c6f9cddf571758e0c44786a509e646a094ef13ade3b1aab7"
-"checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum fs_extra 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
 "checksum fsevent 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)" = "c4bbbf71584aeed076100b5665ac14e3d85eeb31fdbb45fbd41ef9a682b5ec05"
 "checksum fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "1a772d36c338d07a032d5375a36f15f9a7043bf0cb8ce7cee658e037c6032874"
@@ -2015,7 +1988,6 @@ dependencies = [
 "checksum rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "adacaae16d02b6ec37fdc7acfcddf365978de76d1983d3ee22afc260e1ca9619"
 "checksum rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7540fc8b0c49f096ee9c961cda096467dce8084bec6bdca2fc83895fd9b28cb8"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
-"checksum rusty-fork 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9591f190d2852720b679c21f66ad929f9f1d7bb09d1193c26167586029d8489c"
 "checksum ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "eb9e9b8cde282a9fe6a42dd4681319bfb63f121b8a8ee9439c6f4107e58a46f7"
 "checksum salsa 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cad0e2348e2f80725b2980914a08a00267136c3ecf720896d3f7f08eef51e08f"
 "checksum salsa-macros 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c79744109df21b80aef1367669b0a9e4985bc966e76bf0e9321b222ec0b9fbb"
@@ -2069,7 +2041,6 @@ dependencies = [
 "checksum uuid 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0238db0c5b605dd1cf51de0f21766f97fba2645897024461d6a00c036819a768"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
-"checksum wait-timeout 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "b9f3bf741a801531993db6478b95682117471f76916f5e690dd8d45395b09349"
 "checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "92c1eb33641e276cfa214a0522acad57be5c56b10cb348b3c5117db75f3ac4b0"
diff --git a/crates/ra_ide_api/Cargo.toml b/crates/ra_ide_api/Cargo.toml
index 97c8bab181..c64226801f 100644
--- a/crates/ra_ide_api/Cargo.toml
+++ b/crates/ra_ide_api/Cargo.toml
@@ -30,7 +30,12 @@ ra_assists = { path = "../ra_assists" }
 
 [dev-dependencies]
 insta = "0.7.0"
-proptest = "0.9.0"
+
+[dev-dependencies.proptest]
+version = "0.9.0"
+# Disable `fork` feature to allow compiling on webassembly
+default-features = false
+features = ["std", "bit-set", "break-dead-code"]
 
 [features]
 jemalloc = [ "jemallocator", "jemalloc-ctl" ]
diff --git a/crates/ra_ide_api_light/Cargo.toml b/crates/ra_ide_api_light/Cargo.toml
index a30833dc37..4e69f5325b 100644
--- a/crates/ra_ide_api_light/Cargo.toml
+++ b/crates/ra_ide_api_light/Cargo.toml
@@ -17,5 +17,10 @@ ra_fmt = { path = "../ra_fmt" }
 
 [dev-dependencies]
 test_utils = { path = "../test_utils" }
-proptest = "0.9.0"
 insta = "0.7.0"
+
+[dev-dependencies.proptest]
+version = "0.9.0"
+# Disable `fork` feature to allow compiling on webassembly
+default-features = false
+features = ["std", "bit-set", "break-dead-code"]
diff --git a/crates/ra_text_edit/Cargo.toml b/crates/ra_text_edit/Cargo.toml
index 5769940df4..b400260041 100644
--- a/crates/ra_text_edit/Cargo.toml
+++ b/crates/ra_text_edit/Cargo.toml
@@ -7,7 +7,12 @@ publish = false
 
 [dependencies]
 text_unit = "0.1.6"
-proptest = "0.9.0"
+
+[dependencies.proptest]
+version = "0.9.0"
+# Disable `fork` feature to allow compiling on webassembly
+default-features = false
+features = ["std", "bit-set", "break-dead-code"]
 
 [dev-dependencies]
 test_utils = { path = "../test_utils" }